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BGCSE Horticulture 1257 study materials
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BGCSE Horticulture 1257 practice questions

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Question 1Plant Science and Plant Propagation

Which part of a typical flowering plant is the main site of photosynthesis?

  1. The leaf blade Correct answer.
  2. The root cap
  3. The stem pith
  4. The petal

Explanation

The leaf blade (lamina) is broad and thin and contains most of the plant's chloroplasts, so it captures light and carries out most photosynthesis. Other organs may photosynthesise slightly, but the leaf is the principal site.

Question 2Plant Science and Plant Propagation

A seed is sown and a young shoot emerges and grows upward. Which tropism explains this response?

  1. Geotropism
  2. Thigmotropism
  3. Phototropism Correct answer.
  4. Hydrotropism

Explanation

Phototropism is growth in response to light direction, causing shoots to bend toward the light source. Geotropism is a gravity response, thigmotropism a touch response, and hydrotropism a water response.

Question 3Plant Science and Plant Propagation

Which structure in a flower produces the male gametes contained in pollen?

  1. The stigma
  2. The sepal
  3. The ovary
  4. The anther Correct answer.

Explanation

The anther is part of the stamen and contains pollen grains, inside which male gametes develop. The stigma and ovary are female structures, and sepals protect the developing bud.

Question 4Plant Science and Plant Propagation

Which of the following is the best example of a stem modified for vegetative propagation?

  1. A strawberry runner Correct answer.
  2. A sweet potato storage root
  3. A pea tendril
  4. A carrot taproot

Explanation

A runner is a horizontal stem that roots at its nodes to form new plants, so it is a stem modification used in vegetative propagation. Roots and tendrils serve other functions and are not stems used this way.

Question 5Plant Science and Plant Propagation

Which environmental factor is normally required for a seed to break dormancy and germinate?

  1. Freezing temperatures
  2. High salinity
  3. Complete darkness
  4. Adequate moisture Correct answer.

Explanation

Seeds need water to rehydrate tissues and activate enzymes for germination, together with suitable temperature and oxygen. Darkness, freezing, and salinity are not general requirements and often inhibit germination.

Question 6Plant Science and Plant Propagation

Which process describes the transfer of pollen from the anther of one flower to the stigma of a different flower of the same species?

  1. Cross-pollination Correct answer.
  2. Self-pollination
  3. Fertilisation
  4. Germination

Explanation

Cross-pollination is pollen transfer between different flowers of the same species, which promotes genetic variation. Self-pollination occurs within one flower or plant, while fertilisation is the fusion of gametes after pollen tube growth.

Question 7Plant Science and Plant Propagation

Which type of root system is typical of a grass plant such as maize?

  1. A fibrous root system Correct answer.
  2. Adventitious storage tubers
  3. A single deep taproot
  4. Aerial prop roots only

Explanation

Grasses and monocots typically develop a fibrous root system made of many similar adventitious roots arising from the stem base. Dicots more often form a single dominant taproot.

Question 8Plant Science and Plant Propagation

Which of these is a dicotyledonous plant characteristic?

  1. Flower parts usually in fours or fives Correct answer.
  2. A fibrous root system
  3. Leaves with parallel veins
  4. A single cotyledon in the seed

Explanation

Dicot flowers typically have parts in fours or fives, and their seeds have two cotyledons. Parallel veins, single cotyledons, and fibrous roots are monocot features.

Question 9Plant Science and Plant Propagation

A gardener takes a stem cutting, removes the lower leaves, and inserts the cut end into moist rooting medium. Why are the lower leaves removed?

  1. To supply extra nutrients to the stem
  2. To encourage flowering
  3. To increase the number of nodes
  4. To reduce water loss while roots are absent Correct answer.

Explanation

A cutting without roots cannot replace water lost through leaves, so removing lower leaves reduces transpiration and improves survival. It does not increase nodes or directly feed the stem.

Question 10Plant Science and Plant Propagation

Which propagation method produces offspring that are genetically identical to the parent plant?

  1. Raising from seed after cross-pollination
  2. Growing F2 hybrid seed
  3. Sowing open-pollinated seed
  4. Taking softwood cuttings Correct answer.

Explanation

Vegetative methods such as cuttings produce clones because no gamete fusion occurs, so the offspring match the parent. Seed from cross-pollination or hybrid lines is genetically variable.

Question 11Plant Science and Plant Propagation

A student grafts a scion onto a rootstock. Which part determines the fruit variety produced by the tree?

  1. The graft union
  2. The scion Correct answer.
  3. The callus tissue
  4. The rootstock

Explanation

The scion is the shoot portion that grows into the canopy and bears flowers and fruit, so it determines the variety. The rootstock supplies roots and influences vigour and soil adaptation, not fruit type.

Question 12Plant Science and Plant Propagation

Which practice best improves the success of seed germination in a seedbed?

  1. Firming soil and keeping the seedbed moist Correct answer.
  2. Sowing deeply in dry, compacted soil
  3. Flooding the bed daily with cold water
  4. Leaving the bed fully exposed to strong sun

Explanation

Firming soil improves seed-to-soil contact for water uptake, and steady moisture supports germination. Dry, compacted, flooded, or overexposed conditions reduce germination and seedling survival.

Question 13Plant Science and Plant Propagation

Which statement correctly describes the role of the cotyledon in a germinating bean seed?

  1. It anchors the seedling in the soil
  2. It stores food reserves used before leaves form Correct answer.
  3. It absorbs water directly from the soil
  4. It becomes the first true leaf

Explanation

Cotyledons are seed leaves holding stored food that nourishes the seedling until it can photosynthesise. The radicle anchors and absorbs water, and true leaves develop later from the shoot apex.

Question 14Plant Science and Plant Propagation

A nursery worker wants to propagate a plant that rarely sets viable seed but produces many side shoots. Which approach is most appropriate?

  1. Collect and sow the few seeds produced
  2. Wait for natural self-seeding
  3. Cross-pollinate with an unrelated species
  4. Use vegetative propagation such as division or cuttings Correct answer.

Explanation

When seed is scarce or unreliable, vegetative propagation uses the plant's own tissues to produce new plants quickly and true to type. Relying on rare seed or distant crosses is slow and uncertain.

Question 15Plant Science and Plant Propagation

Which condition most directly causes a pollen tube to grow toward the ovule after pollination?

  1. A gravity stimulus from the soil
  2. A chemical stimulus from the style and ovule Correct answer.
  3. A light stimulus from the sun
  4. A touch stimulus from the stigma

Explanation

After pollen lands, chemical signals from the stigma, style, and ovule guide the pollen tube down to the ovule for fertilisation. Gravity, touch, and light are not the guiding mechanism for pollen tubes.

Question 16Plant Science and Plant Propagation

A farmer notices that a batch of seeds has a hard, impermeable seed coat. Which treatment is most likely to improve germination?

  1. Storing the seeds in a freezer
  2. Sowing deeper than usual
  3. Soaking or scarifying the seed coat Correct answer.
  4. Applying foliar fertiliser to the soil surface

Explanation

Hard seed coats restrict water entry, so scarification or soaking breaks the barrier and allows imbibition. Cold storage, deeper sowing, or surface fertiliser does not overcome coat impermeability.

Question 17Plant Science and Plant Propagation

Which explanation best accounts for why a rooted leaf cutting of a begonia can form a complete new plant?

  1. Leaves contain stored seeds ready to sprout
  2. Leaves can photosynthesise without roots
  3. The cut surface absorbs nutrients from the air
  4. Leaf cells retain the ability to form roots and shoots Correct answer.

Explanation

Many plant cells remain totipotent and can dedifferentiate to form adventitious roots and shoots, allowing a leaf to regenerate a whole plant. Leaves do not contain seeds, and nutrient uptake from air is negligible.

Question 18Plant Science and Plant Propagation

Which factor would most likely reduce the rooting success of softwood cuttings taken in hot weather?

  1. A moist rooting medium
  2. High transpiration with low humidity Correct answer.
  3. Use of a clean sharp blade
  4. Removal of lower leaves

Explanation

Softwood cuttings lose water easily, and hot, dry air increases transpiration faster than a rootless stem can replace it, causing wilting. Clean tools, moist medium, and leaf removal all help success.

Question 19Plant Science and Plant Propagation

A grower wants uniform, true-to-type plants of a named apple variety. Which method is most suitable?

  1. Collecting self-set seedlings
  2. Sowing seed from the apple
  3. Crossing two apple varieties
  4. Grafting scion wood onto a rootstock Correct answer.

Explanation

Named fruit varieties are maintained by grafting because seed from a heterozygous tree does not breed true. Grafting copies the scion exactly and also allows control of tree size through the rootstock.

Question 20Plant Science and Plant Propagation

Which sequence correctly describes the main stages from pollination to seed formation?

  1. Pollination, fertilisation, embryo development, seed maturation Correct answer.
  2. Pollination, germination, fertilisation, embryo growth
  3. Germination, pollination, fertilisation, fruit set
  4. Fertilisation, pollination, seed dispersal, germination

Explanation

Pollen transfer is followed by pollen tube growth and fertilisation, then the zygote develops into an embryo and the ovule matures into a seed. Germination occurs only after the seed is shed and meets suitable conditions.

Question 21Plant Science and Plant Propagation

A plant is placed in a box with a single opening facing a window. After several days, the shoot bends toward the opening. Which explanation is most accurate?

  1. Cells on the lit side divide faster than shaded cells
  2. Auxin accumulates on the lit side, inhibiting all growth
  3. The shoot grows toward gravity rather than light
  4. Auxin accumulates on the shaded side, promoting greater cell elongation there Correct answer.

Explanation

Light causes lateral redistribution of auxin toward the shaded side, where higher auxin promotes elongation, bending the shoot toward the light. Gravity is not the cause of this directional bending.

Question 22Plant Science and Plant Propagation

Two batches of cuttings are taken from the same parent plant on the same day. Batch A roots well, while Batch B develops rot at the base. Which difference most likely explains this outcome?

  1. Batch B received more light
  2. Batch B was kept in waterlogged medium with poor aeration Correct answer.
  3. Batch B had more nodes per cutting
  4. Batch B was taken with a sharper blade

Explanation

Waterlogged medium excludes oxygen, so the cut base cannot respire and is invaded by rot organisms. Blade sharpness, node number, and light do not directly cause basal rotting.

Question 23Plant Science and Plant Propagation

A seed producer finds that plants grown from a hybrid variety give variable offspring. Which explanation best fits this observation?

  1. The hybrid has lost the ability to photosynthesise
  2. Seed propagation always kills the embryo
  3. The hybrid parent is homozygous, so offspring should be uniform
  4. The hybrid parent is heterozygous, so its gametes differ and offspring segregate Correct answer.

Explanation

A hybrid is heterozygous at many loci, so meiosis produces varied gametes and the next generation segregates. This is why hybrids are re-created each year rather than saved for seed.

Question 24Plant Science and Plant Propagation

Which combination of conditions would most favour successful germination of most vegetable seeds?

  1. Adequate moisture, suitable warmth, and oxygen Correct answer.
  2. Deep burial, strong light, and low humidity
  3. Dry soil, cold temperature, and no oxygen
  4. Saturated soil, high salinity, and darkness

Explanation

Germination requires water for imbibition, a suitable temperature for enzyme activity, and oxygen for respiration. Dry, waterlogged, saline, or deeply buried conditions limit one or more of these needs.

Question 25Plant Science and Plant Propagation

A gardener compares a taprooted seedling and a fibrous-rooted seedling of the same age. Which conclusion is best supported?

  1. Both seedlings must be dicots
  2. The taprooted seedling is likely a dicot, while the fibrous-rooted one is likely a monocot Correct answer.
  3. Both seedlings must be monocots
  4. Root type gives no information about plant group

Explanation

A single dominant taproot is typical of dicots, whereas a fibrous system of similar adventitious roots is typical of monocots. Root type therefore gives a useful clue to plant group.

Question 26Plant Science and Plant Propagation

Which part of a typical flower produces the pollen grains?

  1. The anther Correct answer.
  2. The sepal
  3. The ovary
  4. The stigma

Explanation

The stamen is the male reproductive organ of a flower and consists of a filament topped by the anther. The anther contains pollen sacs in which pollen grains develop, so it is the structure that produces and releases pollen when it matures.

Question 27Plant Science and Plant Propagation

A gardener wants to raise many new plants from a single healthy carrot plant that has finished flowering. Which method takes advantage of a structure the carrot naturally produces?

  1. Lifting and dividing the taproot
  2. Collecting and sowing the seed Correct answer.
  3. Layering the side branches
  4. Taking hardwood stem cuttings

Explanation

Carrot is a biennial that flowers in its second year and sets large quantities of viable seed. Seed is the natural reproductive structure of this crop, and each seed can give rise to a new plant, so saving seed is the practical way to multiply one plant.

Question 28Plant Science and Plant Propagation

A seed is sown too deeply in a heavy clay soil. Which explanation best accounts for poor emergence?

  1. The seed coat becomes too soft to split open
  2. Stored food reserves are used up before the shoot reaches the surface Correct answer.
  3. The cotyledons begin photosynthesis underground
  4. The embryo is damaged by contact with soil particles

Explanation

A germinating seed depends entirely on its stored food reserves until the first true leaves expand and begin photosynthesis. If the shoot must grow through a long depth of compacted soil, those reserves are exhausted before the seedling reaches light, so the seedling dies or emerges weakly.

Question 29Plant Science and Plant Propagation

A plant breeder crosses two pure-breeding lines and finds that the first filial generation is uniform, but the second filial generation shows a 3:1 ratio of two contrasting forms of a trait. Which conclusion is best supported?

  1. The two parental lines were not truly pure-breeding
  2. The trait is controlled by a single gene with one allele dominant over the other Correct answer.
  3. The trait is influenced only by the environment
  4. The trait is controlled by two genes acting together

Explanation

A uniform first generation followed by a 3:1 ratio in the second generation is the classic signature of a single gene with complete dominance. The dominant allele masks the recessive one in the heterozygote, and random segregation at meiosis produces the three-to-one proportion among the offspring.

Question 30Plant Science and Plant Propagation

Two rooted cuttings of the same clone are potted in identical medium. One is placed in full midday sun and the other in bright filtered light, and both are watered equally. After three weeks the sunlit plant has smaller, thicker leaves and shorter internodes. Which interpretation best fits these observations?

  1. The sunlit plant has acclimatised to high light intensity Correct answer.
  2. The sunlit plant is suffering a nutrient deficiency
  3. The shaded plant has produced more chlorophyll per leaf
  4. The two plants differ because of genetic mutation

Explanation

Plants can adjust their growth form to the light environment, a response known as acclimatisation. High irradiance typically produces thicker, smaller leaves and shorter internodes, which reduce light interception and heat load, whereas shade-grown plants become taller and thinner with broader leaves.

Question 31Soils, Soil Management and Plant Nutrition

Which soil particle size fraction holds the greatest amount of plant-available water and nutrients because of its large surface area?

  1. Sand
  2. Coarse silt
  3. Gravel
  4. Clay Correct answer.

Explanation

Clay particles are the smallest soil fraction and carry a very large surface area relative to their mass, so they adsorb water and nutrient ions strongly. This gives clay a high water-holding and nutrient-holding capacity, although drainage and aeration are poorer than in sandy soils.

Question 32Soils, Soil Management and Plant Nutrition

A grower wants to raise soil pH from 5.0 to about 6.5 before planting vegetables. Which material is the standard choice?

  1. Ammonium sulfate fertiliser
  2. Agricultural lime (calcium carbonate) Correct answer.
  3. Elemental sulfur
  4. Aluminium sulfate

Explanation

Lime is a base that neutralises soil acidity and raises pH toward the range most vegetables prefer. Elemental sulfur and acidifying fertilisers move pH in the opposite direction, and aluminium sulfate is not a recommended liming material.

Question 33Soils, Soil Management and Plant Nutrition

Which of the following is the main reason organic matter improves a sandy soil?

  1. It raises bulk density
  2. It increases water and nutrient retention Correct answer.
  3. It reduces cation exchange capacity
  4. It speeds leaching of nitrate

Explanation

Organic matter acts like a sponge and a charged surface, holding water and nutrient cations that sandy soils would otherwise lose. It also lowers bulk density and increases cation exchange capacity, so the other options describe the opposite of its effects.

Question 34Soils, Soil Management and Plant Nutrition

Which macronutrient is most directly responsible for promoting strong root development and early maturity in plants?

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

Explanation

Phosphorus is associated with root growth, energy transfer and early crop maturity, which is why it is often placed near the seed at planting. Nitrogen mainly drives leafy growth, potassium regulates water and quality, and calcium supports cell walls.

Question 35Soils, Soil Management and Plant Nutrition

What does a soil pH of 6.5 indicate about the soil solution?

  1. It is neutral
  2. It is strongly alkaline
  3. It is strongly acidic
  4. It is slightly acidic Correct answer.

Explanation

The pH scale runs from 0 to 14, with 7 being neutral. A value of 6.5 is just below neutral, so the soil is slightly acidic, which is favourable for the availability of most nutrients.

Question 36Soils, Soil Management and Plant Nutrition

Which practice most directly reduces soil erosion on a sloping vegetable plot?

  1. Leaving the soil bare between crops
  2. Removing crop residues after harvest
  3. Ploughing downslope each season
  4. Planting cover crops across the slope Correct answer.

Explanation

Cover crops and contour planting slow runoff and hold soil particles in place, greatly reducing erosion on slopes. Bare soil, downslope ploughing and residue removal all expose the surface to raindrop impact and washing.

Question 37Soils, Soil Management and Plant Nutrition

Which soil organism group is best known for breaking down dead plant residues and releasing nutrients?

  1. Root hair cells
  2. Bacteria and fungi Correct answer.
  3. Moles and earthworms only
  4. Nematodes only

Explanation

Bacteria and fungi are the primary decomposers of organic residues, converting them into humus and releasing nutrients in plant-available forms. Earthworms and other fauna assist by fragmenting material, but the main chemical breakdown is microbial.

Question 38Soils, Soil Management and Plant Nutrition

A soil test reports 12 mg/kg of available phosphorus, and the recommended level for the crop is 25 mg/kg. How much available phosphorus per kilogram of soil is the crop short of?

  1. 25 mg/kg
  2. 37 mg/kg
  3. 12 mg/kg
  4. 13 mg/kg Correct answer.

Explanation

The shortfall is the recommended level minus the measured level, so 25 minus 12 equals 13 mg/kg. Adding the two values or reporting the measured value alone does not give the deficit.

Question 39Soils, Soil Management and Plant Nutrition

Which statement best explains why heavy clay soil waterlogs after rain?

  1. The soil has a very low cation exchange capacity
  2. Large pores drain water too quickly
  3. The soil contains too much coarse sand
  4. Small pores restrict the movement of air and water Correct answer.

Explanation

Clay soils are dominated by very small pores that hold water tightly and conduct it slowly, so drainage is poor and air is excluded. This waterlogged condition can suffocate roots and favour anaerobic organisms.

Question 40Soils, Soil Management and Plant Nutrition

Which nutrient deficiency symptom is most typical of nitrogen shortage in a leafy crop?

  1. Curling of leaf margins only
  2. Purple colour on young leaves
  3. Uniform yellowing of older leaves first Correct answer.
  4. Brown spots on new leaves

Explanation

Nitrogen is mobile in the plant, so when supply is low the plant moves nitrogen from older leaves to new growth. This produces general yellowing that begins on the oldest leaves.

Question 41Soils, Soil Management and Plant Nutrition

A grower applies 200 kg of a 20-10-10 fertiliser to a plot. How many kilograms of nitrogen does this supply?

  1. 20 kg
  2. 10 kg
  3. 200 kg
  4. 40 kg Correct answer.

Explanation

The first figure in a fertiliser grade is the percentage of nitrogen, so 20 percent of 200 kg is 40 kg. The other figures refer to phosphorus and potassium oxides, not nitrogen.

Question 42Soils, Soil Management and Plant Nutrition

Which soil management practice is most likely to increase soil organic matter over several seasons?

  1. Regular incorporation of compost and crop residues Correct answer.
  2. Continuous clean cultivation with no returns
  3. Burning residues after every harvest
  4. Deep ploughing that buries all surface litter

Explanation

Adding compost and returning crop residues supplies carbon that microbes convert into stable organic matter. Burning, removing residues and excessive cultivation all deplete organic matter faster than it forms.

Question 43Soils, Soil Management and Plant Nutrition

Which practice is the best way to correct a strongly acidic soil before planting a pH-sensitive crop?

  1. Apply gypsum and irrigate heavily
  2. Add more nitrogen fertiliser
  3. Apply lime and incorporate it, then retest Correct answer.
  4. Compact the soil to reduce leaching

Explanation

Lime neutralises acidity, and incorporating it into the plough layer allows it to react throughout the root zone. Soil should then be retested because over-liming can reduce micronutrient availability.

Question 44Soils, Soil Management and Plant Nutrition

Which soil texture is generally easiest to manage for both drainage and water retention?

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

Explanation

Loam contains a balanced mixture of sand, silt and clay, giving good drainage together with adequate water and nutrient retention. Heavy clay, sand and gravel each lack one of these favourable properties.

Question 45Soils, Soil Management and Plant Nutrition

Which process converts ammonium nitrogen in the soil into nitrate?

  1. Denitrification
  2. Nitrogen fixation
  3. Ammonification
  4. Nitrification Correct answer.

Explanation

Nitrification is the microbial oxidation of ammonium to nitrite and then nitrate, which plants can readily absorb. Denitrification converts nitrate back to nitrogen gas, fixation converts atmospheric nitrogen into ammonia, and ammonification releases ammonium from organic matter.

Question 46Soils, Soil Management and Plant Nutrition

Why does adding gypsum help reclaim sodic soil?

  1. It increases the sodium adsorption ratio
  2. Calcium displaces sodium on exchange sites Correct answer.
  3. It dissolves sodium chloride crystals directly
  4. It raises the pH above 9

Explanation

Gypsum supplies calcium, which replaces sodium on the clay exchange sites. The displaced sodium can then be leached away with irrigation water, improving structure and permeability.

Question 47Soils, Soil Management and Plant Nutrition

A crop shows interveinal yellowing on young leaves while veins stay green. Which nutrient is most likely deficient?

  1. Iron Correct answer.
  2. Nitrogen
  3. Potassium
  4. Phosphorus

Explanation

Iron is immobile in the plant, so deficiency appears first on new leaves as interveinal chlorosis. Nitrogen and potassium shortages usually appear on older leaves, and phosphorus deficiency tends to cause purple colouring.

Question 48Soils, Soil Management and Plant Nutrition

Which action would most directly improve drainage in a compacted garden bed?

  1. Adding more clay to the surface
  2. Aerating and incorporating organic matter Correct answer.
  3. Watering more frequently
  4. Driving machinery across the bed

Explanation

Aeration breaks up compacted layers, and organic matter improves aggregation and pore space, allowing water and air to move. Adding clay, overwatering or using heavy machinery worsens compaction.

Question 49Soils, Soil Management and Plant Nutrition

Which statement best explains why phosphorus is often applied in bands near the seed rather than broadcast?

  1. Phosphorus is a gas that escapes quickly
  2. Phosphorus moves very little in soil Correct answer.
  3. Phosphorus is highly soluble and leaches easily
  4. Phosphorus is fixed only in sandy soils

Explanation

Phosphate ions react with soil minerals and move only a short distance from where they are placed. Banding concentrates the nutrient in the root zone so young plants can reach it efficiently.

Question 50Soils, Soil Management and Plant Nutrition

A soil has a high cation exchange capacity but is dominated by sodium ions. What is the most likely consequence for plant growth?

  1. Faster leaching of excess sodium
  2. Improved aggregation and aeration
  3. Higher availability of calcium and magnesium
  4. Poor structure and reduced uptake of other cations Correct answer.

Explanation

When sodium dominates the exchange complex, clay particles disperse, destroying aggregates and blocking pores. The high sodium also competes with calcium, magnesium and potassium uptake, so plant growth suffers.