Biofertilizers and Biofuels

1. Which among these options is considered as green manure?

  1. Maize
  2. Farmyard Manure
  3. Aloe Vera
  4. Sunn Hemp
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Answer: Option D. Sunn Hemp

2. What is the purpose of Rhizobium?

  1. It aids in photosynthesis
  2. It provides immunity to plants
  3. It helps in nitrogen fixation in plants
  4. It helps in pollination
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Answer: Option C. It helps in nitrogen fixation in plants

3. Which plant species are used as green manure in agricultural land and sandy soil?

  1. Crotalaria juncea and Alhagi camelorum
  2. Dichanthium annulatum and Azolla nilotica
  3. Saccharum munja and Lantana camara
  4. Calotropis procera and Phyllanthus niruri
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Answer: Option A. Crotalaria juncea and Alhagi camelorum

4. What kind of chemical fertilizers are required for rhizobial nitrogen fixation?

  1. Potassium Fertilizer
  2. Nitrogen Fertilizer
  3. Phosphorus Fertilizer
  4. Sulfur Fertilizer
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Answer: Option C. Phosphorus Fertilizer

5. Which biofertilizer can be found within the roots of leguminous plants?

  1. Mycorrhiza
  2. Rhizobium
  3. Azotobacter
  4. Blue-green algae
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Answer: Option B. Rhizobium