Discuss the two main limitations of plant hybridization programme.
(i) Plant hybridization programme is often constrained by the availability of limited number of disease resistance genes that are present in various crop varieties or wild relatives.
(ii) Several wild relatives of different cultivated species of plants have been shown to have certain resistant character but have very low yield.
In animal husbandry, if two closely related animals are mated for a few generations, it results in loss of fertility and vigour. Why is this so?
Define the term stress' for plants. Discuss briefly the two types of stress encountered by plants.
Discuss natural selection and artificial selection. What are the implications of the latter on the process of evolution?
Life style 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?
Can gamma rays used for crop improvement programmes prove to be harmful for health? Discuss.
Name the improved characteristics of wheat that helped India to achieve green revolution.
It is said, that diseases are spreading faster due to globalisation and increased movement of people. Justify the statement taking the example of H5N1 virus.
Plants raised through tissue cultures are clones of the parent' plant. Discuss the utility of these plants.
(a) The shift from grain to meat diets creates more demands for cereals. Why? (b) A250 kg cow produces 200 g of protein per day but 250 g of Methylophillus methylotrophus can produce 25 tonnes of protein. Name this emerging area of research. Explain its benefits.
You are planning to set up a Dairy Farm. Describe the various aspects you would consider before you start the venture.
A few statements are given below followed by a set of terms in a box. Pick the correct term and write it against the appropriate statement.
a. Mating of closely related individuals within the same breed
b. Mating of animals of same breed but having no common ancestors on either side for 4-6 generations
c. Mating of animals of two different species
d. Breeding of animals belonging to different breeds
(i) Cross breeding, (ii) Inter-specific hybridization,
(iii) Out breeding, (iv) Out crossing, (v) Inbreeding
Modem methods of breeding animals and plants can alleviate the global food shortage'. Comment on the statement and give suitable examples.
Does apiculture offer multiple advantages to farmers? List its advantages if it is located near a place of commercial flower Cultivation.
If your family owned a dairy farm, what measures would you undertake to improve the quality and quantity of milk production?
Discuss how the property of plant cell totipotency has been utilised for plant propagation and improvement
(a) Mutations are beneficial for plant breeding. Taking an example, justify the statement.
(b) Discuss briefly the technology that made us self-sufficient in food production.
What are three options to increase food production? Discuss each giving the salient features, merits and demerits.
In the area of plant breeding, it is important not only to preserve the seeds of the variety being cultivated, but also to preserve all its wild relatives. Explain with a suitable example.
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?
What are the physical barriers of a cell in-the protoplast fusion experiment? How are the barriers overcome?
What are the advantages of tissue culture methods over conventional method of plant breeding in crop improvement programmes?
In the area of plant breeding, it is important not only to preserve the seeds of the variety being cultivated, but also to preserve all its wild relatives. Explain with a suitable example.
Is there any relationship between dedifferentiation and the higher degree of success achieved in plant tissue culture experiments?