Raju is searching blight resistant plants for his crossing experiments. Unfortunately no such varieties are available.
a. Suggest a process to create such plants.
b. Justify your suggested method.

Observe the following A and B. a. List out the desirable characters in the plants given in figures A and B. b. Suggest a possible technique to integrate these characters in a new variety. c. Explain the process involved in the technique you suggested.

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.

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.

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.