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Biofertilisers

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Which of the following statements is/are incorrect ? (i) Cyanobacteria are autotrophic microbes widely distributed in aquatic and terrestrial habitats. (ii) Anabaena, Nostoc and Oscillatoria are photosynthetic N_(2) -fixing cyanobacteria. (iii) Tolypothrix (BGA) can increase rice production by about 20% (iv) BGA add organic matter to the soil and increase its fertility. (v) In our country, biofertilisers are not available commercially in the markets for farmers.

A biofertiliser is

Which of the following is a non-symbiotic biofertiliser ?

Which one of the following can be used as biofertiliser in cotton field?

Which of the following is widely used as a successful biofertiliser in Indian rice field ?

Azolla pinnata has been found to be an important biofertiliser for paddy crops. This quality is due to the presence of

Rhizobium is a .............. bacteria that serves as biofertiliser.

ARIHANT PUBLICATION-SAMPLE PAPER 5-SECTION B (ZOOLOGY)
  1. Biofertilisers

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  2. A draught breed of a cow is

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  3. Sperm acrosome is derived from

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  4. The surgical method in females to avoid pregnancy is

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  5. Choose the correct answer from the choices given under each bit/ Give ...

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  6. Choose the correct answer from the choices given under each bit/ Give ...

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  7. Fill in the blanks with correct answer(s)/Correct the underlined porti...

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  8. A cross between F1-hybrid and a recessive parent gives the ratio of

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  9. Fill up the blanks with correct answer(s)./Correct the underlined port...

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  10. Fill in the blanks with correct answer(s)/Correct the underlined porti...

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  11. Fill in the blanks with correct answer(s)/Correct the underlined porti...

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  12. Answer any three of the following (restrict each answer 2 to 3 importa...

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  13. Answer any three of the following (restrict each answer 2 to 3 importa...

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  14. Answer any three of the following (restrict each answer 2 to 3 importa...

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  15. Answer any three of the following (restrict each answer 2 to 3 importa...

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  16. Answer any three of the following (restrict each answer 2 to 3 importa...

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  17. Answer any three of the following (restrict each answer 2 to 3 importa...

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  18. Differentiate between any one of the following (restrict the answer 3 ...

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  19. Illustrate in detail the process of spermatogenesis in human.

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  20. Briefly explain the 'struggle for existence' concept of Darwin's theor...

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  21. Nature plays a decisive role in selecting the fit organisms'. Explain...

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