Chapter 9: Strategies for Enhancement in Food Production – Case-Based Questions with Answers

CBSE Class 12 Biology Case-Based Questions (NCERT): Strategies for Enhancement in Food Production

Course & Examination Details

Course: CBSE Class 12 Biology
Unit: Unit III – Biology and Human Welfare
Chapter: Chapter 9 – Strategies for Enhancement in Food Production
Prescribed Textbook: NCERT Biology Class XII
Examination: CBSE Class 12 Board Examination
Question Type: Case-Based / Source-Based Questions
Syllabus Alignment: Strictly as per NCERT

Section A: Animal Husbandry

Case 1

A farmer adopts scientific methods to improve milk yield in his dairy farm.
Q. Which branch of agriculture is being practised?
Answer: Dairy farm management under animal husbandry.

Case 2

Regular vaccination and balanced feed are provided to cattle.
Q. How do these practices benefit livestock?
Answer: They improve health, prevent diseases, and increase productivity.

Case 3

Closely related cattle are mated for several generations.
Q. Identify the breeding method.
Answer: Inbreeding.

Case 4

After several generations of inbreeding, fertility reduces.
Q. Name this condition.
Answer: Inbreeding depression.

Case 5

Two different breeds of cattle are crossed to improve yield.
Q. What is this method called?
Answer: Cross-breeding.

Case 6

Cross-bred animals show better growth and disease resistance.
Q. Which phenomenon is responsible?
Answer: Hybrid vigour (heterosis).

Case 7

Farmers rear chickens mainly for egg production.
Q. Which farming practice is this?
Answer: Poultry farming.

Case 8

Birds with high egg-laying capacity are selected.
Q. Why is selection important in poultry farming?
Answer: It improves productivity and economic returns.

Case 9

Honeybees are reared near crop fields.
Q. Name this agricultural practice.
Answer: Apiculture.

Case 10

Crop yield improves due to bee activity.
Q. What role do bees play here?
Answer: Pollination.

Section B: Plant Breeding

Case 11

Scientists collect seeds from different regions for crop improvement.
Q. What is this collection called?
Answer: Germplasm collection.

Case 12

Two superior plant varieties are crossed to obtain better offspring.
Q. Name this process.
Answer: Hybridisation.

Case 13

Plants showing desirable traits are chosen from a population.
Q. Identify the step involved.
Answer: Selection.

Case 14

A new crop variety resists fungal infection.
Q. Which objective of plant breeding is achieved?
Answer: Disease resistance.

Case 15

Crops tolerate drought conditions without yield loss.
Q. Which type of stress resistance is this?
Answer: Abiotic stress resistance.

Section C: Biofortification

Case 16

A wheat variety with higher iron content is developed.
Q. What strategy has been used?
Answer: Biofortification.

Case 17

Biofortified crops are promoted in rural areas.
Q. State one advantage of this approach.
Answer: It reduces micronutrient deficiency sustainably.

Case 18

Nutritional quality of crops improves at the production stage.
Q. Why is this better than supplementation?
Answer: It is cost-effective and reaches larger populations.

Section D: Single Cell Protein (SCP)

Case 19

Microorganisms are cultured to produce protein-rich biomass.
Q. Identify the food source produced.
Answer: Single Cell Protein (SCP).

Case 20

SCP is produced using industrial waste materials.
Q. Mention one benefit of this method.
Answer: It reduces environmental pollution.

Case 21

SCP is used as a dietary supplement in developing countries.
Q. Why is SCP suitable for this purpose?
Answer: It is a cheap and rich protein source.

Section E: Tissue Culture

Case 22

A small piece of plant tissue is grown in a nutrient medium.
Q. Name this technique.
Answer: Tissue culture.

Case 23

A single plant cell regenerates into a complete plant.
Q. Which property enables this?
Answer: Totipotency.

Case 24

Large numbers of identical plants are produced rapidly.
Q. What is this process called?
Answer: Micropropagation.

Case 25

Plantlets grown in laboratory are gradually exposed to external conditions.
Q. Why is this step necessary?
Answer: Hardening helps plants adapt to natural environment.