Q2 of 465 Page 58

What are the two ways of obtaining fish?

The two ways of obtaining fish are

(i) Capture fishery. Fish is caught from natural waters both marine as well as inland (freshwater bodies)


(ii) Culture fishery.Fish is grown in water bodies through human efforts. The mature is harvested


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7

Vikash went to vegetable market with his elder sister, a M.Sc. Botany student. There he saw many varieties of different vegetables such as different kinds of chillies (short, long, round, pungent, less pungent, green, reddish, orange), several varieties of potato and tomatoes. He asked his sister the following questions:

(i) What is the need of producing so many varieties of different crop plants.


(ii)What is the name of branch of science which deals with crop improvement?


(iii) What are the methods used by plant breeders?


(iv) What is hybridization?

 1

Give one example of an Indian and foreign poultry breed which when crossed produce an improved variety. List any one desirable trait expected from such cross breeding.

 2

What is the major problem faced in fish farming ? How can it be overcome.

 3

Discuss two ways of incorporating desirable characteristics into crop varieties.