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Test: Microbes as Biofertilisers (January 13) - NEET MCQ


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10 Questions MCQ Test - Test: Microbes as Biofertilisers (January 13)

Test: Microbes as Biofertilisers (January 13) for NEET 2024 is part of NEET preparation. The Test: Microbes as Biofertilisers (January 13) questions and answers have been prepared according to the NEET exam syllabus.The Test: Microbes as Biofertilisers (January 13) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Microbes as Biofertilisers (January 13) below.
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Test: Microbes as Biofertilisers (January 13) - Question 1

Organic farming does not include:

Detailed Solution for Test: Microbes as Biofertilisers (January 13) - Question 1

Organic farming includes serval methods to enhance soil fertility. In such farming, methods of biological origin are used, e.g., biopesticides, biogertilisers, IPM (Integrated Pest Management) green manure, bioherbicides, keeping pess and pathogens under control, etc. chemical fertilisers are not used in organic farming.

Test: Microbes as Biofertilisers (January 13) - Question 2

Farmers have reported over 50% higher yields of rice by using which of the following biofertilisers?

Detailed Solution for Test: Microbes as Biofertilisers (January 13) - Question 2

Azolla pinnata is a small free floating freshwater fern which multiplies rapidly, doubling every 5-7 days. The fern can live with Anabaena symbiotically in rice field to fix atmospheric nitrogen. It does not interfere with their growth. In some South-East Asian countries, especially China, the rice fields are regularly provided with Azolla.

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Test: Microbes as Biofertilisers (January 13) - Question 3

Biofertilisers are organisms that enrich the nutrient quality of the soil. Which of the following can be used as biofertilisers?

Detailed Solution for Test: Microbes as Biofertilisers (January 13) - Question 3

Biofertilisers are microorganisms which bring about nutrient enrichment of soil by enhancing the availability of nutrients to crops. Microorganisms which act as biofertilisers are bacteria, cyanobacteria (blue green algae) and mycorrhizal fungi. Bacteria and cyanobacteria have the property of nitrogen fixation while mycorrhizal fungi preferentially withdraw minerals from organic matter for the plant with which they are associated. They maximize ecological benefits and minimize environmental hazards.

Test: Microbes as Biofertilisers (January 13) - Question 4

The reason that the chemical/synthetic fertilisers should be replaced by biofertilisers is that the former:

Detailed Solution for Test: Microbes as Biofertilisers (January 13) - Question 4

Chemical fertilisers are being used in increasing amounts to increase output in high yielding varieties of crop plants. However, chemical fertilisers cause pollution of water bodies as well as groundwater, besides getting stored in crop plants. They are expensive and also require a lot of energy resources in their manufacture. 

Test: Microbes as Biofertilisers (January 13) - Question 5

 Which of the following statements is not correct regarding mycorrhiza?

Detailed Solution for Test: Microbes as Biofertilisers (January 13) - Question 5

Several fungi are known to form symbiotic association with plants, i.e., Mycorrhiza. The most common fungi partners of mycorrhiza are Glomus species. Mycorrhiza roots show a sparse or dense wooly growth of fungus hyphae on their surface. The fungus remains restricted to the cortex of the root. The vascular strands and growing parts are not affected. The fungal symbionts in these associations absorb phosphorus from soil and pass it to the plant. Plants having such associations show other resistance to root-borne pathogens and drought and an overall increase in plant growth and development.

Test: Microbes as Biofertilisers (January 13) - Question 6

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 N2 - 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.

Detailed Solution for Test: Microbes as Biofertilisers (January 13) - Question 6

Biofertilizers are available commercially in our country for farmers.

Test: Microbes as Biofertilisers (January 13) - Question 7

A nitrogen fixing microbe associated with the fern Azolla in rice fields is:

Detailed Solution for Test: Microbes as Biofertilisers (January 13) - Question 7

Anabaena azollae, a cyanobacterium that lives in symbiotic association with the free-floating water fern Azolla. Anabaena azollae can grow Photo-autotrophically and fixes atmospheric nitrogen. The inoculation of cyanobacteria in rice crops significantly influences the growth of rice crop by secretion of ammonia in flood water.

Test: Microbes as Biofertilisers (January 13) - Question 8

Which one of the following pairs is correctly matched?

Detailed Solution for Test: Microbes as Biofertilisers (January 13) - Question 8

Mycorrhiza is a symbiotic association of a fungus with the roots of a higher plant. Ectomycorrhiza, which lie on surface of the root, help in direct absorption of minerals from the soil over a large area. Rhizobium is a Parasite and Azospirillum is a free living nitrogen fixing bacteria. Methanogenic bacteria help in production of biogas

Test: Microbes as Biofertilisers (January 13) - Question 9

Match column I with column II and select the correct answer from the codes given below.

Detailed Solution for Test: Microbes as Biofertilisers (January 13) - Question 9
  • Mycorrhizae helps in phosphorus uptake from the soil.
  • Bacillus thuringiensis is a bioinsecticide.
  • Leghaemoglobin is present in the root nodules in leguminous plants.
  • Azadiractin is a secondary metabolite present in the neem seeds and it acts as a biopesticide.
Test: Microbes as Biofertilisers (January 13) - Question 10

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

Detailed Solution for Test: Microbes as Biofertilisers (January 13) - Question 10

Cotton is a dicotyledonous crop. The best biofertiliser for cotton is Bacillus cereus and Azotobacter chroococcum. These are free-living N2 fixing bacteria and enhance the fertility of the soil.

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