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What Are Biofertilizers

Which of the ...

Question

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, fertilizers are not available commercially in the markets for farmers.

A

(v) Only

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B

(iv) Only

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C

(iii) Only

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D

None of these

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Solution

The correct option is A (v) Only
Biofertilizers are available commercially in our country for farmers.
So, the correct option is '(v) Only'

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Similar questions

Q. Assertion :Organic farming is very beneficial for farmers to increase crop production. Reason: Bacteria, fungi, mycorrhiza, cyanobacteria are better biofertilizer which fixes nitrogen and increase soil fertility.

Q. Assertion :- Crop production without use of chemical fertilizers is called organic farming.
Reason :- Cyanobacteria are autotrophic prokaryotes which are used as biofertilizers in paddy fields.

Q. Statement-1: Manure helps in enriching the soil with nutrients and organic matter.
Statement-2: Fertilizers are rich in nutrients and thus, are required in small amounts, as compared to manures.
Statement-3: Continuous use of fertilizers in an area increases soil fertility because the organic matter in the soil is replenished.

Q. How do bacteria and cyanobacteria increase soil fertility? Explain.

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i. Microorganisms are used as food preservatives.
ii. Microorganisms increase soil fertility.
iii. Microorganisms are used to make antibiotics.
iv. Some Microorganisms clean the environment.

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What Are Biofertilizers

Standard XII Biology

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