Ramu and Somu are farmers. Ramu cultivated the crops by self fertilization method. Somu cultivated the crops from mixed population.
Write the advantages and distadvantages of their selection.

Ramu and Somu are farmers. Ramu cultivated the crops by self fertilization method. Somu cultivated the crops from mixed population. Who will get new variety?

Gopalan cultivated a variety of fruit crops and plants in his field and Raman destroyed the fruit crops and plants and cultivated rubber trees which are double in number. a. In your opinion which method is suitable for the ecosystem? Give reason. b. mention any three factors for the extinction of species.

Ramu cultivated pea plants as an inter crop in his paddy field. After harvesting, he allowed the roots of the pea plants remain in the soil for some period. a. Is the action of Ramu reasonable? b. Justify your answer.

A Farmer is cultivating different vegetable crops in a field. One day he could see white rust symptoms of Albugo destroying the Greens but all other crops are found healthy. He reports this observation to you. Can you find out the reason why this pathogen has not attacked other vegetable crops

A farmer has lot of banana trees in his farm.He wishes to go in for selection to improve the crop.Which method can be adopted in banana?

a. The following are the important steps in plant breeding for developing a new plant variety. List them in the correct order: i. Seed multiplication ii. Release of a variety iii. Distribution iv. Evaluation v. Creation of genetic variation vi. Selection b. In spite of the proper application of fertilizers, irrigation and pest and disease control the yield, quality and disease and pest resistance of a self pollinated crop variety is decreasing generation after generation. Suggest a possible reason for this experience. Hint: The farmer is using seed collected from his own field for raising successive crops.

a.Through which method do genes for disease resistance is transferred from a related crop to a cultivated variety? b.Give example for a vegetable crop which was transferred by this method. c.Give the name of new variety

Choose correct statement(s) about ''Azolla': (I) Azolla is a free-floating water fern. (II) Azolla fixes the atmospheric nitrogen in association with nitrogen fixing blue green alga Anabaena azollae. (III) It is used as a bio-fertilizer for wetland rice cultivation. (IV) Not suitable for rice crop.