16.

17.

18.

19.

20.

21.

29.

23.

24.

25.

26.

27.

367227

2 C 41234
Part B

All questions can be attended. Each question carries 5 marks.

Maximum Ceiling 35.
Write on factors affecting microbial population in soil.
Write on the effect of pesticides on soil microbes.
Biopesticides.
Symbiotic nitrogen fixation.
Write on any two fungal disease of plants and their control measures.
Explain Associative symbiosis with examples.
Humus formation and its importance.
Animal - microbe interaction.

Part C

Essay any two questions.

Each question carries 10 marks.
Explain the disease symptoms, disease cycle and control of rice blast and tomato wilt.
Explain types of soil microbes and their role in soil fertility.
Explain on various microbe - microbe interactions.

Explain on Biopesticides and their advantages on chemical pesticides.

(2 x 10 = 20 marks)

367227