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Microbes in Human Welfare Test - 21

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Microbes in Human Welfare Test - 21
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Mycorrhiza represents
    Solution
    Mycorrhiza is the symbiotic relationship between fungi and roots of the higher plants where fungi help in increasing the surface area of absorption. They also help in the mineral uptake by the plant in return plant provides protection and shelter and food to the fungi
    So, the correct answer is 'Symbiosis'
  • Question 2
    1 / -0
    Which one of the following is not biofertilizer?
    Solution
    Agrobacterium is a gene transfer agent. Agrobacterium tumefaciens causes crown gall disease of a wide range of dicotyledonous (broad - leaves) plants, especially members of the rose family such as apple, pear, peach, cherry, almond, raspberry, and roses.
    So, the correct answer is option B.
  • Question 3
    1 / -0
    Clostridium acetobutylicum helps in the production of 
    Solution
    Clostridium acetobutylicum is a commercially valuable bacterium. It produces acetone, ethanol, and butanol from starch at the same time.
    So, the correct answer is 'All of the above'.
  • Question 4
    1 / -0
    Citric acid is produced by
    Solution
    Aspergillus is a genus of fungi. The largest application of Aspergillus niger is as the major source of citric acid. The bacteria is useful for the commercial production of citric acid. 
    Thus, the correct answer is option A. 
  • Question 5
    1 / -0
    Rhizosphere is the region where ?
    Solution
    The rhizosphere is the small region or zone of soil that is directly influenced by root secretions and associated soil microorganisms. It is an area of soil immediately surrounding the roots along with root surface. This region influences plant roots. A major characteristic of the rhizosphere is the release of organic compounds by plant roots into the soil. Due to this, the environment of rhizosphere is very much different from rest of the soil. 
    Thus, the correct answer is option C.
  • Question 6
    1 / -0
    Find out the pairs, which are correctly matched.
    A. Cyanobacteria                      (i.) Biopesticides
    B. Mycorrhiza                          (ii.) Solubilization of phosphate
    C. Bacillus thuringiensis          (iii.) Cry protein
    D. Single-cell protein               (iv.) Rhizobia
    Solution
    Bacillus thuringiensis (Bt) is commonly used as a biopesticide. It is sporulating, a gram-positive facultative-aerobic soil bacterium. It synthesizes the proteins known as delta endotoxins or cry proteins which infect the insects by paralyzing the digestive tract and makes it porous.
    So, the correct answer is option B.
  • Question 7
    1 / -0
    Yield of paddy field can be increased by application of
    Solution
    Blue-green algae are ideally suited for propagation in rice fields because blue -green algae form a self-sufficient system which is capable of fixing atmospheric nitrogen in organic forms and which grows upon a free water surface. It increases nitrogen content of moist soil and water bodies, which can be used in increasing paddy yield
    So, the correct answer is 'Nostoc/Anabaena'
  • Question 8
    1 / -0
    VAM is important for
    Solution
    Vesicular-arbuscular mycorrhiza (VAM) is formed by the symbiotic association between certain phycomycetous fungi and angiosperm roots. It improves plant growth through phosphorous nutrition. In addition to phosphorous, they also help in the uptake of other nutrient elements. Nutrient absorption by fungal symbionts is due to external hyphae of the fungus proliferating beyond the nutrient depletion zone and reaching the source of nutrients. Mycorrhizal fungi appear to be extremely advantageous to crops grown in soils with low fertility.
    So, the correct answer is 'Phosphate nutrition'
  • Question 9
    1 / -0
    Which of the following can use molecular nitrogen as nutrient?
    Solution
    Rhizobium fixes the nitrogen symbiotically. The nitrogen-fixing bacteria enter the roots and lead to the incessant growth of the cortical cells which form nodules that act as a primary site for the nitrogen fixation. The enzyme nitrogenase is primarily used for the conversion of molecular nitrogen.
    So, the correct answer is option C.
  • Question 10
    1 / -0
    Biofertilizers
    Solution
    Biofertilizers are used because they increase soil fertility, crop productivity, and production. Use of biofertilizers is both economical as well as environment-friendly. They remain symbiotically associated with the roots while some are free living. They solubilize the undissolved minerals.
    So, the correct answer is option C.
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