Tamil Nadu HSE First Year Home Science cheat sheet

Home Science is an interdisciplinary field applying science, arts and social science to everyday family living; its five classical areas are food and nutrition, textiles and clothing, home management, child development, and community/extension education.

Scope is threefold: personal and family living (health, resources, relationships), community welfare (extension, nutrition education, health awareness), and vocational preparation (self-employment and wage employment).

Career paths from Home Science: dietitian and nutritionist, food technologist, food-preservation entrepreneur, textile designer, fashion merchandiser, interior designer, preschool teacher, crèche supervisor, child counsellor, extension officer, consumer activist, and home-science teacher.

Government-sector openings include ICDS supervisor/anganwadi worker, nutritionist in health departments, food inspector, textile/food quality-control posts, and Home Science teacher posts in schools; eligibility depends on the specific degree and diploma.

Self-employment options built on Home Science skills: catering units, bakery, pickle and papad making, tailoring and boutique, embroidery and fabric painting, day-care centre, and interior-decor consultancy.

Home Science differs from pure science in its applied, family-centred orientation; its method is problem-solving applied to real household and community situations.

The subject integrates natural science (chemistry, biology, physics), social science (psychology, sociology, economics), and humanities (art, design), so its research methods are both quantitative and qualitative.

Extension education is the outreach arm: it transfers research-based knowledge to rural and urban families through demonstrations, exhibitions, campaigns and audio-visual aids.

Family functions: reproduction, socialization, economic (production and consumption), emotional security, protection of the young and elderly, and transmission of culture.

Family types by structure: nuclear (parents and children), joint (two or more generations with shared residence and kitchen), and extended (relatives beyond the household who still share obligations).

Family life cycle stages: beginning (newly married), expanding (childbearing and child-rearing), launching (children leave), contracting/ageing (retirement, widowhood); resource needs and role demands shift at each stage.

Resources are human (time, energy, knowledge, skills, attitudes, interest) or non-human (money, goods, property, community facilities); all are limited, so management means choosing among competing uses.

Role conflict arises when two roles make incompatible demands on the same time or energy (for example, a working mother's job and caregiving); role overload is when total demands exceed available resources.

Decision-making steps in the family: identify the problem, list alternatives, examine resources and consequences, choose, implement, and evaluate the outcome.

Community resources include schools, primary health centres, anganwadi centres, public libraries, banks, cooperatives, panchayat services, and self-help groups; using them reduces pressure on family resources.

Communication within the family is effective when the message is clear, the listener is not distracted, feedback is sought, and 'I' statements are used instead of blame.

Changing family patterns in India: rising nuclear households due to migration, more women in paid work, smaller family size, delayed marriage, and increased dependence on institutional care for children and the elderly.

Macronutrients and energy: carbohydrate 4 kcal/g, protein 4 kcal/g, fat 9 kcal/g; dietary fibre supplies little energy but aids bowel function and lowers cholesterol.

Functions: proteins build and repair tissue; carbohydrates supply the main energy source; fats supply concentrated energy and carry fat-soluble vitamins A, D, E and K; water regulates temperature and transport.

Fat-soluble vitamins A, D, E, K are stored in the body; water-soluble B-complex and C are not stored and must be supplied daily, and are easily lost by leaching and overheating.

Deficiency diseases: vitamin A - night blindness and xerophthalmia; vitamin D - rickets in children, osteomalacia in adults; thiamine (B1) - beriberi; riboflavin (B2) - angular stomatitis; niacin - pellagra; vitamin C - scurvy; iron - anaemia; iodine - goitre; calcium - rickets and tetany.

Protein-energy malnutrition presents as marasmus (severe energy deficiency, marked wasting, no oedema) and kwashiorkor (protein deficiency with oedema, moon face and fatty liver).

Balanced diet: one supplying all nutrients in required amounts and proportions; the food groups are energy-giving (cereals, roots, fats, sugars), body-building (pulses, milk, egg, meat, fish) and protective (vegetables and fruits).

Meal planning principles: meet recommended allowances for age, sex and activity; include all food groups; balance colour, texture, flavour and consistency; respect family budget, season, religion and food habits; avoid repetition.

Biological value and protein complementation: cereal proteins are low in lysine, pulses are low in methionine; combining cereal and pulse (idli, sambar-rice, dal-roti) improves overall protein quality.

Food science concepts: gelatinization of starch on heating with water, caramelization of sugar, Maillard browning between sugars and amino acids, coagulation of protein in egg and milk, and emulsification in mayonnaise.

Preservation aims to prevent microbial growth, delay enzyme action, and stop chemical and physical deterioration; principles are asepsis, removal of moisture, use of heat or cold, addition of preservatives, and exclusion of oxygen.

Methods: drying and dehydration, salting, sugaring, pickling in acid, canning and bottling (heat sterilization), refrigeration and freezing, pasteurization, irradiation, and use of chemical preservatives.

Pasteurization heats milk to about 63 °C for 30 minutes (holding method) or 72 °C for 15 seconds (flash/HTST) and then cools rapidly; it kills pathogens such as Mycobacterium and Salmonella but does not sterilize.

Class I preservatives (natural, permitted in any amount): salt, sugar, vinegar/acetic acid, spices, honey, edible vegetable oils. Class II preservatives (regulated, with maximum limits): benzoic acid and sodium benzoate, sulphur dioxide and sulphites, nitrates and nitrites, sorbic acid.

Botulism is caused by the toxin of Clostridium botulinum, an anaerobic spore-former that grows in improperly canned low-acid foods; adequate heat processing and acidification prevent it.

Freezing does not kill microorganisms; it only stops their multiplication, so thawed food must be handled like fresh perishable food and never refrozen.

Adulteration: metanil yellow in turmeric and sweets, lead chromate in turmeric, sawdust or starch in chilli and pepper powder, chalk powder or soap in milk, vanaspati or mashed potato in ghee and butter, papaya seeds in black pepper, and coloured sawdust in tea.

Simple home detection tests: milk - a drop on a slanting surface flows too fast if water is added; ghee - a teaspoon in a bottle of warm water, pure ghee solidifies white while adulterated floats as yellow globules; turmeric - add dilute acid, metanil yellow gives a pink colour; honey - an impurity test by water solubility; chalk in sugar - effervescence with dilute acid.

Food safety practices: wash hands and utensils, separate raw and cooked food, cook thoroughly, keep food at safe temperatures (below 5 °C or above 60 °C), use safe water, and check FSSAI licence number and expiry date on labels.

Fibre classification: natural (cotton, jute, flax, silk, wool) and man-made (rayon, polyester, nylon, acrylic); natural fibres are further classed as cellulosic (cotton, linen) or protein (silk, wool).

Cotton: cellulose, absorbent, cool, strong when wet, damaged by mildew and strong acids; burns with a steady flame and smells of burning paper.

Silk: protein fibre from the silkworm, lustrous, strong, low elasticity; wool: protein, crimped, insulating, shrinks and felts with heat and friction; both smell of burning hair and form crushable beads.

Rayon (regenerated cellulose) burns like cotton but is weaker when wet; polyester and nylon are synthetic, thermoplastic, low-absorbency, quick-drying, and melt and shrink away from flame.

Yarn properties: staple fibres give spun yarns with twist; filament fibres give smooth continuous yarns; higher twist increases strength; warp yarns are stronger and more twisted than weft.

Basic weaves: plain (strong, firm - cotton sheeting, muslin), twill (diagonal line - denim, gabardine), satin (lustrous, floats - satin fabric); knits stretch because of loop structure.

Care labels and washing: sort by colour and fabric, use the recommended water temperature, avoid chlorine bleach on protein fibres, dry woollens flat in shade, and iron synthetics at low heat.

Stain removal is specific: protein stains (blood, egg, milk) with cold water and enzyme detergent, never hot water; grease with absorbent powder then solvent; ink with alcohol; rust with oxalic acid.

Finishes: mercerization of cotton (lustre and strength), calendering (glaze), sanforization (shrinkage control), water-repellent and flame-retardant finishes; dyeing may be fibre, yarn or piece stage.

Housing functions: shelter and protection, health and sanitation, privacy, family interaction, and a base for work and study; housing quality is judged by light, ventilation, space, sanitation and safety.

Ventilation supplies fresh air and removes heat, moisture, odours and combustion products; cross-ventilation needs inlets and outlets on opposite or adjacent walls, with the outlet larger and higher.

Lighting: daylight factor depends on window area relative to floor area; general lighting gives overall illumination, task lighting is local and stronger, and glare is controlled by diffusing shades.

Principles of design: balance (symmetrical or asymmetrical), rhythm (repetition and gradation), emphasis (focal point), proportion (relation of parts to whole), and harmony (unity of colour, texture, line).

Colour schemes: monochromatic (one hue in tints and shades), analogous (adjacent hues), complementary (opposite hues); warm colours advance and make a room seem smaller, cool colours recede and enlarge.

Elements of design: line, form, texture, colour and space; lines can be vertical (height), horizontal (width), diagonal (activity) or curved (softness).

Work simplification in home management: eliminate unnecessary work, combine tasks, rearrange the workplace, and simplify motions; a work triangle in the kitchen links storage, preparation and cooking areas.

Budgeting steps: estimate income, list fixed and flexible expenses, set savings first, allocate, record spending, and compare actual with planned to control expenditure.

Time and energy management: classify tasks by urgency and importance, use peak-energy hours for heavy jobs, plan rest periods, and use labour-saving equipment for energy conservation.

Development follows principles of sequence: it is continuous, proceeds from head to foot (cephalocaudal) and from centre to extremities (proximodistal), and goes from general to specific responses.

Stages: infancy (0–2 years), early childhood (2–6), later childhood (6–12), and adolescence (12–18); each has characteristic physical, motor, cognitive, language, emotional and social milestones.

Motor milestones in order: lifting head, rolling over, sitting with support, sitting alone, crawling, standing with support, walking with help, walking alone.

Jean Piaget's stages: sensorimotor (0–2, learning through senses and action), preoperational (2–7, symbolic play, egocentric thought), concrete operational (7–11, logical thought about concrete objects), formal operational (11+, abstract reasoning).

Play is the child's work: it develops motor skills, language, social cooperation and emotional release; types include solitary, parallel, associative and cooperative play, and constructive, dramatic and outdoor play.

Immunization schedule in India (under the Universal Immunization Programme): BCG, OPV-0 and hepatitis B birth dose at birth; pentavalent, OPV and rotavirus at 6, 10 and 14 weeks; measles-rubella first dose at 9–12 months, second at 16–24 months; DPT and OPV boosters at 16–24 months; TT/Td at 10 and 16 years.

Weaning should begin around six months while breastfeeding continues; introduce one soft, mashed food at a time to detect allergy, and avoid honey before one year.

Care of the newborn: warmth (skin-to-skin), exclusive breastfeeding for six months, cord hygiene, clean clothing, and prompt attention to danger signs such as poor feeding, lethargy, fever or fast breathing.

Behaviour guidance: reward desirable behaviour, give clear simple rules, avoid physical punishment, and set consistent routines for sleep, meals and play.

Personal hygiene: daily bathing, hand washing with soap before eating and after toilet use, oral care twice daily, nail and hair care, and clean, well-fitting clothing and footwear.

Communicable disease prevention: safe water and food, sanitary disposal of waste and excreta, control of vectors (mosquitoes, flies, rats), ventilation, and isolation of the infected person.

Water purification: boiling for at least 10–20 minutes, chlorination (bleaching powder), filtration, and use of UV or ceramic filters; boiling is the most reliable household method.

First aid aims: preserve life, prevent worsening, promote recovery; sequence is check the scene and the casualty, call for help, then airway, breathing, circulation.

Burns: cool with clean running water for about 10–20 minutes, cover with a clean non-stick cloth, do not apply oil, toothpaste or ice, and do not burst blisters.

Fracture: immobilize the limb with a splint including the joints above and below, support it, and do not attempt to push bone back; sprain: rest, ice, compression and elevation (RICE).

Drowning and choking: for choking in an adult, give back blows and abdominal thrusts; for drowning, remove from water, clear the airway, begin rescue breathing and CPR.

Snake bite: keep the victim calm and still, immobilize the bitten limb below heart level, remove rings and tight items, do not cut, suck or apply a tight tourniquet, and transport to hospital at once.

Fever, diarrhoea and dehydration: oral rehydration solution is the first-line treatment for dehydration; continue feeding and seek care for blood in stool, persistent vomiting or reduced urine.

Consumer rights (Consumer Protection Act, 2019): right to safety, information, choice, be heard, seek redressal, and consumer education; the Act also created the Central Consumer Protection Authority and rules on misleading advertisements and e-commerce.

Consumer responsibilities: check quality, quantity, price and date of manufacture and expiry before buying; insist on a bill; read labels; compare brands; and avoid impulse buying.

Standard marks in India: ISI/BIS mark for industrial goods, AGMARK for agricultural produce, FSSAI licence for food, Hallmark for gold jewellery, and Ecomark for environment-friendly products.

Three-tier redressal under the Consumer Protection Act, 2019: District Commission (claims up to ₹50 lakh), State Commission (above ₹50 lakh up to ₹2 crore), and National Commission (above ₹2 crore).

A complaint may be filed within two years of the cause of action; it can be filed where the complainant resides or works, and e-daakhil is the online filing portal.

Food label information: name of food, list of ingredients in descending order of weight, net quantity, nutritional information per 100 g, veg/non-veg logo, FSSAI licence number, batch number, date of manufacture, best-before/use-by date, and storage instructions.

Family finance concepts: income (money, kind, and psychic income), expenditure (fixed and flexible), savings, investment, and insurance; a budget is a plan for spending, and a record of expenditure is its control.

Savings instruments: recurring and fixed deposits, post-office savings schemes, public provident fund, life and health insurance, and mutual funds; each differs in safety, liquidity and return.

Advertising appeals to emotion, status and fear; a consumer should distinguish fact from persuasion, check unit price, and be alert to bait-and-switch and false 'free' offers.

A balanced meal plan for a day should distribute energy roughly as breakfast 25%, lunch 35–40%, and dinner 25–30%, with the remainder as a mid-morning or evening snack.

Standard measures: 1 cup ≈ 200 ml, 1 tablespoon ≈ 15 ml, 1 teaspoon ≈ 5 ml; raw-to-cooked weight changes (rice about 1:2.5, dal about 1:2) affect portion calculation.

Nutritive value of common foods per 100 g (approximate): rice 345 kcal, wheat flour 341 kcal, whole milk 67 kcal, egg 173 kcal, pulses about 340 kcal, green leafy vegetables 45–50 kcal.

Recipe modification for health: reduce sugar and fat, substitute whole grain for refined flour, add green leafy vegetables, use steaming or grilling instead of deep frying, and reduce salt gradually.

First-aid kit contents: sterile gauze, adhesive plasters, cotton, antiseptic solution, bandage roll, scissors, thermometer, ORS packets, and disposable gloves.

Textile practical: fibre identification by burning test, weave identification by examining the interlacing, and stain removal by testing the reagent on an inconspicuous area first.

Interior design practical: prepare a colour scheme from a colour wheel, draw a floor plan to scale, and check circulation space and furniture clearance before finalizing layout.

Consumer practical: compare two brands of the same product using label information, unit price, net weight and standard marks, and write a reasoned purchase decision.

Child-development practical: prepare low-cost play material from waste (rag doll, bottle-cap rattle, cardboard puzzle) and record the developmental skill it promotes.

Steps of the scientific method: observation, formulation of a hypothesis, experiment or survey, collection and analysis of data, conclusion, and reporting.

Variables: independent (manipulated), dependent (measured), and controlled (held constant); a fair test changes only one variable at a time.

Sampling: a sample must be representative; random sampling reduces bias, and sample size affects reliability of conclusions.

Measures of central tendency: mean (arithmetic average), median (middle value), and mode (most frequent value); the mean is affected by extreme values, the median is not.

Graphs: bar graphs compare categories, line graphs show change over time, and pie charts show parts of a whole; the choice depends on the type of data.

Food analysis tests: Benedict's test for reducing sugar (brick-red precipitate), iodine for starch (blue-black), Biuret for protein (violet), and emulsion test for fat.

Home Science research is applied and interdisciplinary, so it may use surveys, interviews, observation, laboratory tests, and case studies; ethical consent and confidentiality are required.

The three R's - reduce, reuse, recycle - applied at home: reduce packaging, reuse containers, and recycle paper, glass, metal and kitchen waste.

Waste segregation: green bin for biodegradable kitchen and garden waste, blue bin for recyclable dry waste, and red or separate collection for hazardous waste such as batteries and medicines.

Composting converts kitchen waste into manure in about 45–60 days when kept moist and turned; vermicomposting uses earthworms to speed decomposition.

Water conservation at home: fix leaks, use bucket instead of shower, reuse rinse water for gardening, and harvest rainwater from rooftops.

Energy conservation: switch off appliances at the plug, use LED lamps, use pressure cookers, and choose five-star-rated appliances.

Indoor air pollution from biomass cooking smoke is a major health hazard; improved chulhas and chimneys reduce exposure, especially for women and children.

Sustainable textiles: choose natural fibres, repair and restyle garments, donate or upcycle old clothes, and wash at lower temperatures to reduce energy and water use.

Consumer choices affect the environment: buy local and seasonal food, avoid single-use plastic, carry cloth bags, and prefer refillable products.

Integrated Child Development Services (ICDS) provides supplementary nutrition, immunization, health check-up, referral services, pre-school non-formal education, and nutrition and health education through anganwadi centres.

Mid-Day Meal Scheme (now PM POSHAN) provides a hot cooked meal to school children to improve enrolment, attendance and nutritional status.

National Health Mission includes the Universal Immunization Programme and reproductive and child health services.

Poshan Abhiyaan (National Nutrition Mission) targets reduction of stunting, undernutrition, anaemia and low birth weight through convergence and behaviour change.

Pradhan Mantri Ujjwala Yojana provides LPG connections to reduce indoor air pollution from biomass fuel.

Swachh Bharat Mission promotes sanitation, toilet construction and waste management; safe sanitation reduces diarrhoeal disease.

National programmes for anaemia control include iron and folic acid supplementation for adolescents and pregnant women.

Public Distribution System supplies subsidized food grains; the Antyodaya Anna Yojana targets the poorest households.

Nutrition education uses demonstrations, exhibitions, posters, street plays and self-help groups to change food practices in the community.

Life skills identified by WHO include self-awareness, empathy, critical thinking, creative thinking, decision making, problem solving, effective communication, interpersonal relationships, coping with stress and coping with emotions.

Assertiveness is expressing one's needs and rights without violating others' rights; it differs from aggression (violating others) and passivity (not expressing needs).

Conflict resolution steps: define the issue, listen to both sides, identify common ground, generate options, agree on a solution, and review it.

Parenting styles: authoritative (warm and firm, best outcomes), authoritarian (strict, low warmth), permissive (warm, few limits), and uninvolved (low warmth and low control).

Adolescence brings rapid physical change, identity formation, peer influence and emotional intensity; open communication and accurate information support healthy development.

Elderly care needs: health monitoring, nutrition, safety at home, emotional companionship, and financial security; joint families and community support reduce isolation.

Gender roles are learned through socialization; sharing household work and decision making promotes equality and reduces role overload for women.

Family crises such as illness, death, unemployment or migration require resource reallocation, communication and use of community support services.

Body measurements for garment construction: bust, waist, hip, shoulder, armhole, sleeve length, back length, and crotch depth; measurements are taken over fitted clothing with a non-stretch tape.

Pattern making: drafting from measurements, flat pattern methods, and draping; seam allowance is added to the pattern, not to the body measurement.

Basic hand stitches: running stitch (gathering and tucking), back stitch (strong seam), hemming stitch (invisible hem), and blanket stitch (edge finishing).

Seam types: plain seam (most common), French seam (for sheer and lightweight fabrics, encloses raw edges), and flat-felled seam (strong, for jeans and children's wear).

Sewing machine parts: needle, bobbin, presser foot, feed dog, tension disc, and take-up lever; correct tension gives a balanced stitch on both sides.

Fabric preparation before cutting: pre-shrink by washing, straighten the grain, and check for defects; cut on the grain line for correct drape.

Trimming and finishing: clip curves, grade seam allowances, and finish raw edges by overcasting, zigzag or binding to prevent fraying.

Garment care: follow care label symbols, wash similar colours together, dry in shade, and store with proper folding and moth protection for woollens.

Five food groups used in Indian meal planning: cereals and millets; pulses and legumes; milk and milk products; meat, fish, egg and nuts; vegetables and fruits; plus fats and sugars in moderation.

Cooking methods: moist heat (boiling, steaming, stewing), dry heat (baking, roasting, grilling), and frying (shallow, deep, stir-frying); each affects nutrient retention and palatability.

Steaming and pressure cooking retain more water-soluble vitamins than boiling, because there is less leaching into water and shorter cooking time.

Vitamin C is destroyed by heat, light, oxygen and prolonged storage; cut vegetables just before cooking and add them to boiling water to shorten cooking time.

B-complex vitamins are water-soluble and leached into cooking water; use the cooking water in gravies or soups to retain them.

Overcooking causes protein toughening, fat oxidation and loss of texture; minimal cooking with lid on preserves nutrients.

Sprouting increases vitamin C, B-complex and availability of minerals; fermentation improves digestibility and B-vitamin content.

Milling of cereals removes bran and germ, reducing fibre and B vitamins; parboiling rice retains more nutrients than polished white rice.

Food combinations: cereal plus pulse improves protein quality; adding fat to green leafy vegetables improves absorption of beta-carotene and fat-soluble vitamins.

Safe drinking water standards: potable water should be free of pathogens, turbidity, colour, odour, and harmful chemicals; chlorine residual indicates protection.

Sanitation: safe disposal of human excreta, sullage and solid waste; a sanitary latrine prevents fly breeding and groundwater contamination.

Vector control: eliminate standing water for mosquitoes, cover food and use fly traps, and keep rats out with proper storage and waste disposal.

Communicable diseases spread by water (cholera, typhoid), food (food poisoning), air (tuberculosis, influenza), vectors (malaria, dengue) and contact (skin infections).

Non-communicable diseases linked to lifestyle: obesity, diabetes, hypertension, heart disease and some cancers; risk is reduced by balanced diet, exercise, no tobacco and limited alcohol.

Community health services: sub-centre, primary health centre, community health centre, district hospital; referral moves from the periphery to higher levels.

Health education methods: individual counselling, group discussion, demonstration, role play, street theatre, posters and mass media.

Occupational and environmental health: safe disposal of industrial waste, protection from smoke and dust, and safe use of chemicals at home.