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NCERT Exemplar · Class 12 · Biology

Chapter 9: Strategies for Enhancement in Food Production

Practice each question, then open the answer or worked solution.

SHORT ANSWER TYPE QUESTIONS

21 questions
Q1Written answer

You are planning to set up a Dairy Farm. Describe the various aspects you would consider before you start the venture.

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Worked solution

First and foremost a proper cattle management is necessary where light and air should be available. Then, the availability of food on the farm is considered. The time and amount of food given to the cattle are taken into consideration. It is important to have an arrangement of health care to look after the cattle and also to do the treatment of sick animals.

Q2Written answer

It is said that diseases are spreading faster due to globalization and the increased movement of people. Justify the statement by taking the example of the H5N1 virus.

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Worked solution

Migrating from one place to another is an important cause of globalization. So the chance of the rapid spreading of infectious diseases is more. The virus even can move from human to human; hence, it is transferred to healthy individuals at a very fast pace. Bird flu can transmit from organism to organism.

Q3Written answer

Explain the concept of the Blue Revolution.

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Worked solution

The blue revolution is related to aquatic plants and animals. There was a wide increase in the practice of aquaculture, to increase production. The blue revolution resulted in a major increase in the aquatic organisms and their products.

Q4Written answer

A farmer was facing the problem of low yield from his farm. He was advised to keep a beehive in the vicinity. Why? How would the beehive help in enhancing yield?

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Worked solution

A beehive would have a large number of honey bees. The honey bee is the major pollinator of many plants. Thus pollination increases the seed production. This enhances the rate of pollination and increases the crop of plants.

Q5Written answer

Lifestyle diseases are increasing alarmingly in India. We are also dealing with large-scale malnutrition in the population. Is there any method by which we can address both of these problems together?

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Worked solution

Biofortification can be used to address both problems. It is a technique of breeding crops with higher levels of nutrients example vitamins, minerals, proteins, fats etc. It improves food quality also.

Q6Written answer

How can we improve the success rate of fertilization during artificial insemination in animal husbandry programmes?

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Worked solution

Multiple Ovulation Embryo Transfer Technology (MOET) is used to improve the success rate of fertilization during artificial insemination in animal husbandry.

Q7Written answer

What is meant by germplasm collection? What are its benefits?

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Worked solution

Germplasm collection is nothing but the collection of genes. The entire collection of plants or seeds having all the diverse alleles for all genes in a given crop is done. The benefit of this collection is to maintain diversity. The genes are collected and stored and hence then can be used for future needs.

Q8Written answer

Name the improved characteristics of wheat that helped India to achieve a green revolution.

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Worked solution

Semi-dwarf: The height of the improved plant was neither too short nor too long, hence being semi-dwarf.

High yield: The yield of the improved wheat was very high as compared to the previous times.

Early maturity: Early maturity of the plant was necessary for high production.

Q9Written answer

Suggest some of the features of plants that will prevent insect and pest infestation.

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Worked solution

Morphological features: Various plants have a certain hair-like structure in the stem and other parts of the plants, these features prevent insect pests and Biochemical features which provide resistance to the plants.

Q10Written answer

It is easier to culture plant cells in vitro as compared to animal cells. Why?

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Worked solution

Dedifferentiation is the ability of the cells to lose as well as reverse the ability of differentiation. The plants have the ability to dedifferentiation and become meristematic again. Animals do not have this ability.