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Microbes in Human Welfare Test - 26

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Microbes in Human Welfare Test - 26
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which of the following, grows symbiotically in the leaves of water fern?
    Solution
    Filaments of Anabaena are found living within ovoid cavities inside the leaves of the Azolla plant. Anabaena azollae maintains a mutually beneficial symbiotic relationship with the water fern Azolla and atmospheric nitrogen with the help of the enzyme nitrogenase present in the heterocysts of the Anabaena. Whereas in return water fern leaves provide shelter to the Anabaena. 
    Thus, the correct answer is option D. 

  • Question 2
    1 / -0
    One of the following, aquatic weed has been exploited for biogas production
    Solution
    Eicchornia is an aquatic plant. This plant can be easily cultivated. The plant can be used as an organic fertilizer. They are also used for bioremediation by taking up the chemicals and other elements from the water. The plant is composed of many fibrous tissue. The plant is also being used in various processes for producing biogas, compost and fibre-based material etc. The fibres are acted upon by the organisms to produce biogas. 
    Thus, the correct answer is option C.
  • Question 3
    1 / -0
    VAM is characterized by
    Solution
    Vesicular arbuscular mycorrhizal (VAM) fungus is a type of mycorrhiza characterized by the formation of unique structures, arbuscules and vesicles by fungi of the phylum Glomeromycota. Vesicular arbuscular mycorrhizae are important in helping the plant to increase the nitrate and phosphate uptake. Thus, the correct answer is option C. 
  • Question 4
    1 / -0
    Fertilizers applied to crop plants, pollute
    Solution
    The excessive use of fertilizers has many serious disadvantages like it kills the microorganism of the soil which decreases the fertility of the soil. Nitrate rich water is unfit for drinking and is rather difficult to treat. When nitrate rich water is carried off into surface water bodies such as ponds, rivers, and lakes it proliferates (accelerates) the growth of Algae. These Algae consume dissolved oxygen from water and thus deplete the water of its oxygen content leading to the death of useful aquatic life, such as fish. Such an increase in the growth of Algae in the lakes, ponds etc. resulting in the reduction of oxygen content in water is called as eutrophication.
    So, the correct answer is option D.
  • Question 5
    1 / -0
    Vesicular arbuscular mycorrhizae (VAM) are important in
    Solution
    An arbuscular mycorrhizal (AM) fungus is a type of mycorrhiza characterized by the formation of unique structures, arbuscules and vesicles. VAM fungi help plants to capture nutrients such as phosphorus, nitrogen and micronutrients from the soil. Vesicular-arbuscular mycorrhizae are important in helping the plant's nitrate and phosphate uptake. 
    Thus, the correct answer is option C.
  • Question 6
    1 / -0
    The most quickly available source of nitrogen to plants are
    Solution
    The chemical compound ammonium nitrate, the nitrate salt of ammonium. It is a white crystalline solid and is highly soluble in water. It is predominantly used in agriculture as a high-nitrogen fertilizer.
    Nitrate fertilizers are preferred due to the highest absorbing ability of nitrates by plants, than in any other form. So, the correct answer is option A.
  • Question 7
    1 / -0
    The main sources of biofertilizers are
    Solution
    Biofertilizer is a type of fertilizer containing living microorganisms, that enrich the nutrient quality of the soil. The main sources of biofertilizers are bacteria, fungi, and cyanobacteria (blue-green algae). They form a symbiotic relationship with plants, in which the partners derive benefits from each other.
    So, the correct answer is option D.
  • Question 8
    1 / -0
    Biopesticides are
    Solution
    Biopesticides are the types of pesticides produced by plants, bacteria and certain minerals. It is made up of living organisms or its product that destroys the pest without affecting plants. 
    Thus, the correct answer is option B. 
  • Question 9
    1 / -0
    The angiosperms having mycorhizzae are
    Solution
    A mycorrhiza is a symbiotic association of a fungus and roots of a vascular plant. This association is generally mutualistic, but occasionally weakly pathogenic. These fungi help in mineral uptake. The mycorrhizal fungus is found to be associated with all the three plants like orchids, Sarcodes and Monotrapa.
    Thus, the correct answer is option D.
  • Question 10
    1 / -0
    Which gas is produced during anaerobic fermentation of agricultural wastes?
    Solution
    • Biogas is an alternate source of energy produced by the anaerobic fermentation of domestic sewage, animal wastes, and agricultural wastes in the marshy environment by the microbes. 
    • It is mainly comprised of carbon dioxide, methane, and hydrogen. 

    Thus, the correct answer is option A. 
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