6. Pollen grains in plants are produced in
7. Nitrogen is fixed in ecosystems in ways stated below. Which one of the statements below is false?
8. Ptyalin is an enzyme produced in the
9. Mycobacterium leprae causes leprosy, Corynebacterium diphtheria causes diphtheria and Vibrio comma causes
10. Biotic component of the environment does not include-
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