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Biofertilisers are...

Biofertilisers are

A

microorganisms used to increase the fertility of the soil

B

manures added to soil

C

biochemicals added to soil

D

none of these.

Text Solution

Verified by Experts

The correct Answer is:
A
Biofertilisers are living microorganisms used to increase the soil fertility. Biofertilisers add nutrients through the natural processes of nitrogen fixation, solubilising phosphorus and stimulating plant growth through the synthesis of growth promoting substances. Biofertilisers readily convert complex organic materials into simple compounds, so that plants can take them easily. They can also provide protection against drought and some soil borne diseases. These are cost effective relative to chemical fertilisers and are environmental friendly and prevent damaging of natural resources.
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Similar Questions

Explore conceptually related problems

Make correction wherever you find mistake in spellings/words in the following paragraph/sentences. A. Biofertilisers are a high-cost output but they do not pollute the environment. Acceptability of biofertillisers is also low because they usually produce quick and spectacular results. B. Fungi of mycorrhiza solubilise phosphorus, produce plant growth inhibiting substance and protect host plants from soil nutrients. (C) Biopesticides are those chemical agents that are used for control of weeds. insects and pathogons.

Fill in the blanks: A. Chemical _______ and ___________ are the sources of widespread pollution. B. Spores of Bacillus ___________ Bacillus _________ Produce insecticidal_______Protein. C. Biofertilisers promote plant growth and protect plants from soil _______ D. Mycorrhizae help in solubilisation of ________ which is present in soil in the insoluble forms E. Rhizobia form root ______ in ________ crops and some_______ form symbiotic association with the fern Azolla. F. Different varieties of cheese are known by their characteristic___________ G. Single cell protein (SCP) provides a valuable _____ rich supplement in _______ diet. H. The sewage water is treated till the BOD is found to be_____ I. The bacteria responsible for production of biogas are collectively called _______ J. ______ grwo in milk and convert it to curd.

Knowledge Check

  • Which of the following statement/s is/are wrong? I. Drug can be used for generation of biogas, commonly called gobar gas. II. Biofertilisers are organisms that enrich the nutrient quality of the soil. III. Cyanobacteria are heterotrophic microbes widely distributed in aquatic and terrestrial environments. IV. Many members of the genus Glomus form mycorrhiza. V. Biogas produced by microbes is used as a source of energy in urban areas.

    A
    III and V only
    B
    I, II and III only
    C
    II and IV only
    D
    IV and V only

  • Which of the followig 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
    (v) only
    B
    (iv) only
    C
    (iii) only
    D
    None of these

  • Biofertilisers include

    A
    Nitrogen fixing bacteria
    B
    Mycorrhiza
    C
    Nitrogen fixing cyanobacteria
    D
    All the above

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