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Maharashtra HSC Bifocal Horticulture (B5) study materials
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Maharashtra HSC Bifocal Horticulture (B5) practice questions

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Question 1Fundamentals of Horticulture and Plant Science

In horticultural classification, a crop such as mango that continues to grow and bear fruit for many years from the same woody framework is best described as which type?

  1. Biennial
  2. Annual
  3. Perennial Correct answer.
  4. Ephemeral

Explanation

Perennial crops live for more than two growing seasons and flower or fruit repeatedly from persistent woody or semi-woody structures. Mango, coconut and guava fit this definition because the same plant yields for decades. Annuals complete their life cycle within one season, biennials take two seasons, and ephemerals complete a very short cycle.

Question 2Fundamentals of Horticulture and Plant Science

Which horticultural crop group is defined mainly by its use for flavouring food rather than for its nutritional bulk contribution?

  1. Cereals
  2. Pulses
  3. Oilseeds
  4. Spices and condiments Correct answer.

Explanation

Spices and condiments are grown for aroma, pungency and flavour and are used in small quantities in food preparation. Cereals supply the bulk of dietary carbohydrate, pulses supply protein, and oilseeds are grown for extracted oil. This makes the spice group functionally distinct in the classification of crops.

Question 3Fundamentals of Horticulture and Plant Science

A nursery worker wants a quick, cheap method of vegetative propagation for sugarcane in which a short piece of stem with a bud is planted. Which method is this?

  1. Stem cutting (sett planting) Correct answer.
  2. Air layering
  3. Tongue grafting
  4. Separation of suckers

Explanation

Sugarcane is propagated commercially by planting setts, which are stem cuttings bearing one or more viable buds. Each bud produces a new shoot and the cut ends produce roots, giving a clonal plant identical to the parent. Air layering, grafting and sucker separation are different techniques used for other crops.

Question 4Fundamentals of Horticulture and Plant Science

In grafting a mango, the part of the combined plant that provides the root system and is chosen mainly for soil adaptation is called the:

  1. Rootstock Correct answer.
  2. Collar
  3. Cambium
  4. Scion

Explanation

The rootstock is the lower portion of a grafted plant and supplies roots, anchorage and adaptation to soil and disease conditions. The scion is the upper part that provides the desired cultivar and fruit quality. The cambium is the meristematic tissue layer that must align for the graft union to form.

Question 5Fundamentals of Horticulture and Plant Science

Which soil texture class generally holds the most plant-available water and is considered most desirable for horticultural crop production?

  1. Coarse sand
  2. Loam Correct answer.
  3. Gravel
  4. Heavy clay

Explanation

Loam contains a balanced mixture of sand, silt and clay, giving good water retention together with adequate drainage and aeration. Coarse sand drains too fast and stores little water, while heavy clay holds water but restricts air movement. Gravel has very low water-holding capacity and is unsuitable as a rooting medium.

Question 6Fundamentals of Horticulture and Plant Science

The process by which green leaves use light energy to convert carbon dioxide and water into carbohydrates is called:

  1. Photosynthesis Correct answer.
  2. Transpiration
  3. Guttation
  4. Respiration

Explanation

Photosynthesis occurs mainly in chloroplasts of green leaves, where light energy drives the reduction of carbon dioxide to form carbohydrates and release oxygen. Respiration releases energy by breaking down these carbohydrates, while transpiration and guttation are water-loss processes. Photosynthesis is the fundamental process supplying dry matter to the crop.

Question 7Fundamentals of Horticulture and Plant Science

In horticulture, the term 'climacteric' is applied to fruits such as banana and mango because they:

  1. Show a marked rise in respiration and ethylene production during ripening Correct answer.
  2. Never produce ethylene at any stage of development
  3. Have no detectable respiration after harvest
  4. Ripen only after removal from the parent plant

Explanation

Climacteric fruits exhibit a characteristic increase in respiration rate, the climacteric rise, accompanied by a burst of ethylene at the onset of ripening. This allows them to be harvested mature but unripe and ripened later under controlled conditions. Non-climacteric fruits lack this distinct respiratory peak during ripening.

Question 8Fundamentals of Horticulture and Plant Science

A farmer wants to propagate a true-to-type, virus-free planting material of banana on a large scale within a short time. Which technique is most appropriate?

  1. Root cutting
  2. Seed sowing
  3. Tissue culture (micropropagation) Correct answer.
  4. Air layering

Explanation

Tissue culture multiplies a single clean shoot tip into thousands of identical plantlets in a short period and, when initiated from meristematic tissue, can eliminate many viruses. Banana is a clonal crop whose seed is not used commercially. Air layering and root cuttings are slow and give far fewer propagules.

Question 9Fundamentals of Horticulture and Plant Science

A grower notices that a young papaya seedling has a very long, weak stem with pale leaves because it was raised under dense shade. The most likely physiological cause is:

  1. Frost injury to the growing point
  2. Excess ethylene from the soil
  3. Deficiency of potassium
  4. Etiolation due to insufficient light Correct answer.

Explanation

When light is inadequate, stems elongate rapidly and chlorophyll development is poor, producing pale, spindly growth known as etiolation. The remedy is to raise seedlings under adequate light so that normal compact growth occurs. Nutrient deficiency, ethylene and frost produce different, distinguishable symptoms.

Question 10Fundamentals of Horticulture and Plant Science

Which plant growth regulator is most commonly used to induce early and uniform ripening of harvested banana bunches?

  1. Indole-3-butyric acid
  2. Ethephon Correct answer.
  3. Maleic hydrazide
  4. Gibberellic acid

Explanation

Ethephon releases ethylene when applied and is widely used to ripen banana and other climacteric fruits uniformly after harvest. Gibberellic acid promotes elongation and can delay senescence, while indole-3-butyric acid promotes rooting. Maleic hydrazide is used mainly to suppress sprouting or growth.

Question 11Fundamentals of Horticulture and Plant Science

In a nursery, seedlings are being hardened before transplanting. Which practice correctly describes hardening?

  1. Applying heavy nitrogen fertilizer just before transplanting
  2. Keeping seedlings in continuous shade until the day of transplanting
  3. Irrigating heavily and withholding all sunlight for a week
  4. Gradually exposing seedlings to reduced watering and full sunlight before field planting Correct answer.

Explanation

Hardening gradually reduces watering and increases exposure to full sunlight so that seedlings develop thicker cuticles and become tolerant of field conditions. This reduces transplant shock and improves survival. Heavy nitrogen or continued shade produces soft, succulent growth that suffers severely after transplanting.

Question 12Fundamentals of Horticulture and Plant Science

A grower applies farmyard manure to a vegetable plot mainly to improve the soil's physical condition. Which benefit is most directly attributable to the organic matter?

  1. Permanent elimination of all soil-borne pathogens
  2. Improved soil structure, water-holding capacity and microbial activity Correct answer.
  3. Immediate correction of severe nitrogen deficiency within hours
  4. Guaranteed increase in soil pH above 8.5

Explanation

Organic matter binds soil particles into aggregates, improving aeration, water retention and the activity of beneficial microorganisms. Its nutrients are released slowly, so it does not act within hours like a soluble fertilizer. It does not sterilise soil or guarantee a fixed rise in pH.

Question 13Fundamentals of Horticulture and Plant Science

Which irrigation method is most efficient for a widely spaced orchard where water must reach the root zone with minimal loss to weeds between tree rows?

  1. Furrow irrigation across the whole field
  2. Flood irrigation
  3. Drip irrigation Correct answer.
  4. Overhead sprinkler irrigation

Explanation

Drip irrigation delivers water slowly and directly to the root zone of each tree, minimising evaporation and weed growth between rows. Flood and furrow methods wet large areas and lose water to deep percolation and weeds. Overhead sprinklers wet the canopy and inter-row spaces, increasing evaporation losses.

Question 14Fundamentals of Horticulture and Plant Science

A grower notices that tomato fruits show a dark, sunken, leathery patch at the blossom end while the rest of the fruit looks normal. The disorder is most likely caused by:

  1. Viral infection transmitted by whitefly
  2. Excess phosphorus in the soil
  3. Iron toxicity in the root zone
  4. Calcium deficiency aggravated by irregular water supply Correct answer.

Explanation

Blossom-end rot results from localised calcium deficiency in the fruit, commonly triggered by fluctuating soil moisture that reduces calcium transport. The symptom is a sunken, leathery dark patch at the blossom end. Phosphorus excess, iron toxicity and whitefly-transmitted viruses cause different symptoms.

Question 15Fundamentals of Horticulture and Plant Science

Which practice best describes 'pruning' as distinguished from 'training' in fruit crops?

  1. Directing the framework of branches to a desired shape, whereas pruning only removes roots
  2. Removal of plant parts to control growth and fruiting, whereas training directs the shape of the plant Correct answer.
  3. Application of growth regulators to modify canopy size
  4. Removal of only dead wood, with no effect on fruiting

Explanation

Training establishes the shape and framework of the plant, while pruning is the deliberate removal of shoots, branches or roots to regulate vigour, light penetration and fruiting. The two are related but distinct operations. Pruning affects fruiting and growth, not just dead wood.

Question 16Fundamentals of Horticulture and Plant Science

A vegetable grower wants to reduce flower drop and improve fruit set in tomato during a hot, dry spell. Which foliar spray is most directly aimed at improving fruit set?

  1. Maleic hydrazide
  2. Common salt solution
  3. Copper oxychloride
  4. Planofix (NAA) at a low concentration Correct answer.

Explanation

Low concentrations of NAA, sold as planofix, are sprayed on tomato to reduce flower drop and improve fruit set under stress. Common salt and copper fungicide do not serve this purpose. Maleic hydrazide is a growth retardant and would not improve fruit set.

Question 17Fundamentals of Horticulture and Plant Science

Which of the following is the most appropriate reason for practising crop rotation in a horticultural field?

  1. To guarantee that no weeds will germinate
  2. To ensure the same crop occupies the same bed every year
  3. To eliminate the need for any irrigation
  4. To interrupt the life cycle of soil-borne pathogens and pests and maintain soil fertility Correct answer.

Explanation

Crop rotation prevents the build-up of host-specific pathogens and pests and helps balance nutrient use in the soil. Growing different crops in sequence interrupts the life cycles of organisms that specialise on one host. Rotation supports but does not replace irrigation or weed control.

Question 18Fundamentals of Horticulture and Plant Science

A grower wants to store onion bulbs for several months. Which post-harvest practice most directly reduces storage rots and sprouting?

  1. Piling the bulbs in a dark, damp corner without drying
  2. Curing the bulbs in shade with good ventilation before storage Correct answer.
  3. Storing freshly harvested, wet bulbs in sealed polythene bags
  4. Washing the bulbs and storing them in high humidity

Explanation

Curing allows the neck and outer scales to dry, forming a barrier against rot organisms and reducing sprouting during storage. Wet or sealed storage conditions promote fungal decay and root regrowth. Good ventilation during curing is essential for long keeping quality.

Question 19Fundamentals of Horticulture and Plant Science

In a hybrid seed production programme for a vegetable crop, why is emasculation followed by hand pollination performed?

  1. To increase the number of seeds produced per fruit by stimulating vegetative growth
  2. To prevent self-pollination and ensure the desired cross with pollen from the selected parent Correct answer.
  3. To induce male sterility in the female parent permanently
  4. To eliminate the need for isolation distance between fields

Explanation

Emasculation removes the anthers of the female parent before dehiscence so that self-pollen cannot fertilise the ovules. Hand pollination then applies pollen from the chosen male parent to produce true hybrid seed. Isolation is still required, and emasculation does not create permanent male sterility.

Question 20Fundamentals of Horticulture and Plant Science

Which of the following best explains why a horticulturist would use a rootstock resistant to root-knot nematode when grafting a susceptible vegetable crop?

  1. The rootstock changes the fruit colour of the scion to a new variety
  2. The rootstock eliminates the need for any soil preparation
  3. Grafting transfers resistance genes from rootstock to scion fruit within one season
  4. The rootstock provides genetic resistance in the root zone while the scion gives the desired fruit Correct answer.

Explanation

Grafting combines a nematode-resistant root system with a susceptible but high-yielding scion, so the plant tolerates nematode pressure while producing the desired fruit. The resistance acts in the roots and is not transferred genetically to the scion. Soil preparation is still necessary for good establishment.

Question 21Fundamentals of Horticulture and Plant Science

A grower observes that a crop's lower leaves turn yellow first while the upper leaves remain green, and growth is stunted. Which mobile nutrient deficiency is most consistent with these symptoms?

  1. Calcium
  2. Boron
  3. Nitrogen Correct answer.
  4. Iron

Explanation

Nitrogen is mobile within the plant, so under deficiency it is redistributed from older leaves to growing points, causing lower leaves to yellow first. Calcium, boron and iron are relatively immobile, so their deficiency symptoms appear first on young leaves. This mobility pattern is a useful diagnostic tool.

Question 22Fundamentals of Horticulture and Plant Science

In a comparison of C3 and C4 crop species, which statement correctly explains the higher photosynthetic efficiency of C4 plants under high temperature and light?

  1. C4 plants do not require the Calvin cycle to make sugars
  2. C4 plants lack stomata and therefore lose no water
  3. C4 plants concentrate CO2 at the site of the Calvin cycle, reducing photorespiration losses Correct answer.
  4. C3 plants fix CO2 at night and C4 plants fix it during the day

Explanation

C4 plants use a preliminary carboxylation step to concentrate carbon dioxide around Rubisco, which suppresses photorespiration and improves efficiency at high temperature. They still possess stomata and still use the Calvin cycle, and they fix carbon dioxide during the day. CAM plants, not C3 plants, are the ones that fix carbon dioxide at night.

Question 23Fundamentals of Horticulture and Plant Science

A fruit grower in a coastal area finds that a mango orchard flowers poorly because of excessive vegetative growth. Which combination of practices is most likely to shift the tree towards flowering?

  1. Removing all leaves and stopping all fertilizer application permanently
  2. Applying heavy nitrogen and frequent irrigation
  3. Spraying high doses of gibberellic acid during the vegetative phase
  4. Withholding irrigation and applying a growth retardant such as paclobutrazol Correct answer.

Explanation

Excessive vegetative vigour competes with flowering, so water stress and growth retardants such as paclobutrazol are used to check shoot growth and promote flowering. Heavy nitrogen and irrigation would worsen the vegetative flush. Gibberellic acid generally promotes growth rather than flowering in mango.

Question 24Fundamentals of Horticulture and Plant Science

A grower stores mature green tomatoes in a sealed chamber and the fruit develops off-flavour and excessive softening after several days. Which explanation best accounts for this outcome?

  1. Accumulated ethylene and carbon dioxide inside the sealed chamber accelerated ripening and deterioration Correct answer.
  2. The chamber caused a deficiency of oxygen that completely stopped all respiration
  3. Sealing prevented any ethylene from forming, so ripening was delayed
  4. The fruit absorbed nitrogen from the air and over-ripened

Explanation

In a sealed chamber, ethylene produced by the fruit accumulates and accelerates ripening, while carbon dioxide also builds up and can cause off-flavours. Ventilation is therefore needed to manage the atmosphere during ripening and storage. Sealing does not stop respiration completely.

Question 25Soil Science, Manures and Fertilizers

Which soil particle size fraction is most responsible for the high water-holding capacity of a clayey soil in a horticultural plot?

  1. Coarse sand
  2. Fine clay Correct answer.
  3. Gravel
  4. Silt

Explanation

Clay particles are extremely small and carry surface charges, giving them a very large specific surface area and strong adsorptive attraction for water. This is why clay-rich soils retain more moisture than sands, though often at the cost of poorer drainage and aeration.

Question 26Soil Science, Manures and Fertilizers

A horticulturist wants to improve the structure of a heavy clay soil before planting a vegetable crop. Which practice most directly improves aggregation and porosity?

  1. Adding well-decomposed farmyard manure Correct answer.
  2. Applying fresh lime to raise pH
  3. Flooding the field continuously
  4. Compacting the surface with a roller

Explanation

Organic matter such as well-rotted farmyard manure binds clay particles into stable aggregates, improving porosity, aeration and drainage. Lime corrects acidity but does not directly build aggregate structure, and compaction or flooding worsen it.

Question 27Soil Science, Manures and Fertilizers

In soil, the cation exchange capacity (CEC) is a measure of which property?

  1. The total amount of anions held in solution
  2. The capacity of soil to hold exchangeable cations on its surfaces Correct answer.
  3. The rate at which water infiltrates the surface
  4. The quantity of organic carbon lost through erosion

Explanation

CEC expresses the number of exchangeable cations a soil can retain per unit mass, usually in centimoles of charge per kilogram. It depends mainly on clay type and organic matter content and governs nutrient retention for crops.

Question 28Soil Science, Manures and Fertilizers

Which of the following is classified as a straight nitrogenous fertilizer used in horticultural nutrition?

  1. Urea Correct answer.
  2. Single superphosphate
  3. Muriate of potash
  4. Gypsum

Explanation

Urea contains about 46 per cent nitrogen and supplies only nitrogen, so it is a straight nitrogenous fertilizer. Single superphosphate supplies phosphorus and sulphur, muriate of potash supplies potassium, and gypsum supplies calcium and sulphur.

Question 29Soil Science, Manures and Fertilizers

The nutrient content of urea is approximately which value of nitrogen by weight?

  1. 21 per cent
  2. 60 per cent
  3. 46 per cent Correct answer.
  4. 18 per cent

Explanation

Urea is the most concentrated solid nitrogen fertilizer, containing about 46 per cent nitrogen. This high concentration makes it economical to transport and apply, though it must be managed carefully to limit volatilization losses.

Question 30Soil Science, Manures and Fertilizers

Which practice is most appropriate for conserving soil moisture in a horticultural orchard during a dry spell?

  1. Mulching the soil surface with crop residues Correct answer.
  2. Removing all vegetation and exposing bare soil
  3. Irrigating heavily once and then leaving soil bare
  4. Deep ploughing between rows to break the surface

Explanation

Mulching with crop residues reduces evaporation from the soil surface and moderates temperature, conserving moisture. Bare exposed soil loses water rapidly through evaporation, and deep ploughing can increase drying.

Question 31Soil Science, Manures and Fertilizers

A soil test reports a pH of 5.2 for a vegetable plot. Which amendment is most directly suited to raise this soil pH toward the ideal range for most vegetables?

  1. Agricultural lime Correct answer.
  2. Ammonium sulphate
  3. Elemental sulphur
  4. Aluminium sulphate

Explanation

Agricultural lime, mainly calcium carbonate, neutralizes soil acidity and raises pH. Elemental sulphur, aluminium sulphate and ammonium sulphate are acidifying materials that would lower pH further rather than correct it.

Question 32Soil Science, Manures and Fertilizers

A grower applies a nitrogen fertilizer containing ammonium to a warm, moist, calcareous soil and notices considerable nitrogen loss. Which process most likely accounts for this loss?

  1. Volatilization of ammonia to the atmosphere Correct answer.
  2. Fixation of ammonium onto clay minerals
  3. Leaching of nitrate below the root zone
  4. Denitrification in well-aerated surface soil

Explanation

In warm, moist, alkaline or calcareous soils, ammonium can be converted to ammonia gas and lost to the atmosphere, especially when the fertilizer is surface-applied. Incorporation and moisture management help reduce such volatilization losses.

Question 33Soil Science, Manures and Fertilizers

Which combination correctly describes a fertilizer that supplies two or more major plant nutrients?

  1. Straight fertilizer
  2. Soil amendment
  3. Micronutrient mixture
  4. Complex fertilizer Correct answer.

Explanation

A complex fertilizer contains two or more of the major nutrients, such as nitrogen, phosphorus and potassium, in a single granule. Straight fertilizers supply only one major nutrient, and amendments or micronutrient mixtures are classified separately.

Question 34Soil Science, Manures and Fertilizers

A grower is selecting a green manure crop to incorporate into a vegetable field to add nitrogen. Which choice is best suited for this purpose?

  1. Cotton
  2. Sugarcane
  3. Sunhemp Correct answer.
  4. Maize

Explanation

Sunhemp is a leguminous green manure crop whose root nodules host nitrogen-fixing bacteria, so its incorporation adds both organic matter and nitrogen. Maize, cotton and sugarcane are non-leguminous crops grown for other purposes.

Question 35Soil Science, Manures and Fertilizers

Which property of soil organic matter most directly contributes to improved nutrient availability for horticultural crops?

  1. It provides cation exchange sites and releases nutrients on decomposition Correct answer.
  2. It raises the soil temperature during winter
  3. It reduces the water-holding capacity of sandy soils
  4. It increases bulk density of the soil

Explanation

Organic matter carries negative charges that hold exchangeable cations and, as it decomposes, releases nitrogen, phosphorus and other nutrients in plant-available forms. It also lowers bulk density and increases water retention rather than reducing them.

Question 36Soil Science, Manures and Fertilizers

A soil is classified as saline when its electrical conductivity of the saturation extract exceeds a certain threshold. Which value is generally used to define a saline soil?

  1. 16 dS/m
  2. 4 dS/m Correct answer.
  3. 0.5 dS/m
  4. 1 dS/m

Explanation

A soil is conventionally considered saline when the electrical conductivity of its saturation extract exceeds about 4 dS/m at 25 degrees Celsius. Such soils affect crop growth through osmotic effects on water uptake.

Question 37Soil Science, Manures and Fertilizers

In a soil test report, a grower sees that available phosphorus is low while potassium is adequate. Which fertilizer choice best addresses only the phosphorus deficiency?

  1. Muriate of potash
  2. Single superphosphate Correct answer.
  3. Ammonium sulphate
  4. Urea

Explanation

Single superphosphate supplies phosphorus, so it directly corrects a phosphorus deficiency without adding unnecessary potassium. Muriate of potash adds potassium, and urea and ammonium sulphate supply nitrogen only.

Question 38Soil Science, Manures and Fertilizers

Which practice best reduces nitrate leaching from a horticultural field receiving a high nitrogen application?

  1. Applying nitrogen to bare soil before the crop is planted
  2. Applying the full nitrogen dose at planting
  3. Splitting nitrogen into several doses timed to crop demand Correct answer.
  4. Flood irrigating immediately after a heavy nitrogen application

Explanation

Split applications match nitrogen supply to crop uptake and reduce the amount of nitrate present in soil during periods of heavy rainfall or irrigation. Applying the full dose at once or flooding after application increases the risk of nitrate moving below the root zone.

Question 39Soil Science, Manures and Fertilizers

Which of the following is the most appropriate way to describe the role of a biofertilizer such as Rhizobium in horticultural production?

  1. It fixes atmospheric nitrogen in symbiosis with legume roots Correct answer.
  2. It raises soil pH to neutralize acidity
  3. It kills soil-borne pathogens on contact
  4. It directly supplies phosphorus in large quantities

Explanation

Rhizobium forms nodules on legume roots and fixes atmospheric nitrogen into forms the plant can use. It is not a phosphorus fertilizer, a liming material or a biocide, so its role is specifically biological nitrogen fixation.

Question 40Soil Science, Manures and Fertilizers

A grower wants to supply potassium to a fruit crop but is concerned about chloride sensitivity. Which fertilizer is the more suitable choice?

  1. Muriate of potash
  2. Potassium sulphate Correct answer.
  3. Single superphosphate
  4. Urea

Explanation

Potassium sulphate supplies potassium without chloride and is preferred for chloride-sensitive crops. Muriate of potash contains chloride, while single superphosphate and urea do not supply potassium at all.

Question 41Soil Science, Manures and Fertilizers

Which statement correctly distinguishes farmyard manure from a chemical fertilizer in terms of nutrient release?

  1. Farmyard manure supplies no nitrogen, whereas chemical fertilizers supply all nutrients
  2. Both release nutrients at identical rates throughout the season
  3. Farmyard manure releases nutrients instantly, while chemical fertilizers release them slowly
  4. Farmyard manure releases nutrients slowly as it decomposes, while chemical fertilizers release nutrients readily Correct answer.

Explanation

Farmyard manure must be mineralized by soil microbes before its nutrients become available, so release is gradual and also builds organic matter. Chemical fertilizers are largely water-soluble and supply nutrients readily, which is why they act quickly.

Question 42Soil Science, Manures and Fertilizers

A soil sample from a horticultural plot shows a high sodium adsorption ratio and poor infiltration. Which reclamation approach is most appropriate for such a sodic soil?

  1. Applying muriate of potash to displace sodium
  2. Adding gypsum followed by leaching with good-quality water Correct answer.
  3. Leaving the soil bare and dry to break the sodicity
  4. Adding more sodium chloride to the soil

Explanation

Gypsum supplies calcium, which replaces exchangeable sodium on the clay complex, and the displaced sodium is then removed by leaching with good-quality water. Simply adding sodium salts or potash would not correct the sodium dominance.

Question 43Soil Science, Manures and Fertilizers

A grower applies ammonium sulphate repeatedly to an already acidic soil. What is the most likely long-term effect on soil reaction and nutrient availability?

  1. Soil pH falls further and aluminium toxicity risk increases Correct answer.
  2. Soil pH remains unchanged and nitrogen fixation improves
  3. Soil pH rises and phosphorus availability decreases
  4. Soil pH rises and calcium availability increases

Explanation

Ammonium sulphate is an acidifying fertilizer because nitrification of ammonium releases hydrogen ions. Repeated use on acidic soil lowers pH further, which can increase the solubility and toxicity of aluminium and reduce phosphorus availability.

Question 44Soil Science, Manures and Fertilizers

A horticultural field receives a large dose of fresh, undecomposed manure just before sowing a sensitive vegetable crop, and seedlings show poor emergence and stunted growth. Which explanation is most plausible?

  1. The manure raised soil pH excessively and locked up all micronutrients
  2. Microbial decomposition of the fresh manure tied up nitrogen and generated heat and ammonia Correct answer.
  3. The manure supplied excess phosphorus that inhibited germination
  4. The manure reduced soil salinity below the crop's requirement

Explanation

Fresh, undecomposed manure has a high carbon to nitrogen ratio, so soil microbes immobilize available nitrogen while decomposing it, and the process can also generate heat and ammonia harmful to seedlings. Well-decomposed manure avoids these problems.

Question 45Olericulture (Vegetable Production)

Which vegetable crop is best classified as a solanaceous fruit vegetable grown for its immature green berries in Maharashtra?

  1. Brinjal Correct answer.
  2. Cluster bean
  3. Cucumber
  4. Okra

Explanation

Brinjal (Solanum melongena) belongs to the Solanaceae family and is harvested as an immature fruit, which is botanically a berry. Okra is a malvaceous fruit vegetable, cucumber is cucurbitaceous, and cluster bean is a legume pod crop.

Question 46Olericulture (Vegetable Production)

In olericulture, which group of vegetables is raised by transplanting seedlings rather than by direct field sowing?

  1. Radish, carrot and beetroot
  2. Brinjal, tomato and chilli Correct answer.
  3. Peas, cowpea and French bean
  4. Spinach, coriander and fenugreek

Explanation

Fruit vegetables such as brinjal, tomato and chilli are first raised in a nursery and then transplanted to the main field to secure uniform stands and better establishment. Leafy greens, root crops and most pulse vegetables are normally direct sown because transplanting injures their taproot or reduces stand density.

Question 47Olericulture (Vegetable Production)

Which practice is the standard method of breaking dormancy in potato seed tubers before planting?

  1. Cold storage at 2–4 °C for the whole period
  2. Storing tubers in dark heaps at warm temperature to encourage sprouting Correct answer.
  3. Keeping tubers in sealed polythene bags without aeration
  4. Treating tubers with gibberellic acid and keeping them submerged in water

Explanation

Potato tubers are normally held in dark, warm heaps or pits so that eyes break dormancy and uniform sprouts emerge before planting. Cool storage keeps tubers dormant, and waterlogging or sealed bags cause rotting rather than sprouting.

Question 48Olericulture (Vegetable Production)

A grower wants a continuous supply of tomato for the market over a long period. Which practice directly supports this objective?

  1. Staggering nursery sowing dates at intervals through the season Correct answer.
  2. Applying a single heavy dose of nitrogen at transplanting
  3. Raising a single early crop and uprooting after first picking
  4. Growing only one determinate variety in the entire area

Explanation

Staggered sowings spread harvest over successive weeks and keep market supply continuous. A single crop, a single variety or one fertilizer dose cannot extend the picking period, and determinate types finish fruiting early.

Question 49Olericulture (Vegetable Production)

Which vegetable is a typical cool-season (rabi) crop in Maharashtra?

  1. Bitter gourd
  2. Cauliflower Correct answer.
  3. Maize as a vegetable
  4. Bottle gourd

Explanation

Cauliflower is a cole crop that performs best in cool weather and is widely grown in the rabi season. Bottle gourd, bitter gourd and vegetable maize are warm-season crops that suffer in low temperatures.

Question 50Olericulture (Vegetable Production)

Which nutrient is most closely associated with root and tuber development in crops such as carrot and radish?

  1. Calcium
  2. Potassium Correct answer.
  3. Sulphur
  4. Nitrogen

Explanation

Potassium supports carbohydrate translocation and root enlargement, so it is emphasized in root crops. Excess nitrogen instead favours top growth, while calcium and sulphur serve structural and quality roles rather than root bulking.