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Biological Classification Test - 42

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Biological Classification Test - 42
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which of the following is not a characteristic of a virus?
    Solution

    A virus is an infectious agent which needs a host or living cell to replicate itself. It cannot be cultivated in a lifeless media and cannot grow outside the living cell. IT can affect all living organisms i.e. humans, plants animals etc.

    The correct answer is E.

  • Question 2
    1 / -0
    Lichens do not like to grow in cities because of
    Solution
    Lichens are used as the indicators of air pollution. These structures grow on tree bark and rocks. Air pollutants which are in the gaseous forms get dissolved in the rainwater, especially SO$$_2$$ (sulfur dioxide) can damage lichens, and check them from growing. In places where lichens are not growing, it indicates that the air is heavily polluted with sulfur dioxide and other pollutants. In cities, SO$$_2$$ is one of the most common air pollutants as it releases from the vehicles.
    Thus, the correct answer is option A. 
  • Question 3
    1 / -0
    The denitrifying bacteria are
    Solution
    Denitrifying bacteria are microorganisms that convert nitrates in soil into free atmospheric nitrogen. This results in depleting the soil fertility and reducing agricultural productivity, Micrococcus denitrificans, Thiobacillus denitrificans, Paracoccus denitrificans, Pseudomonas aeruginosa are examples of denitrifying bacteria. In absence of denitrification, the earth’s supply of nitrogen will accumulate in the oceans, as nitrates are continuously leached from the soil into nearby bodies of water. Thus the correct answer is option D.
  • Question 4
    1 / -0
    Which among the following is not a locomotory organ in protozoa?
    Solution
    The term parapodium refers to two different organs. In annelids, parapodia are paired, un-jointed lateral outgrowths that bear the chaetae. It is not present in protozoans.
    The organelles of protozoa have functions similar to the organs of higher animals. The plasma membrane enclosing the cytoplasm also covers the projecting locomotory structures such as pseudopodia, cilia, and flagella.
    Hence the correct option is B.
  • Question 5
    1 / -0
    Select a binucleate cell from the following
    Solution
    Nuclear dimorphism is a phenomenon in which there are two types of nucleus in the cell. The lower organisms like Paramoecium shows this property of having two different type of nucleus. The smaller nucleus is known as the micronucleus which is involved in the reproductive processes. The larger nucleus is known as the macronucleus involved in the regulation and control of metabolism.
    Thus, the correct answer is option D. 
  • Question 6
    1 / -0
    Diatomaceous earth is the wall deposition of
    Solution
    Diatomaceous earth is the fossil remain of the tiny organisms knows as diatoms. It is highly absorptive and made up of silica. Cells of diatoms are surrounded by the cell wall, having a higher concentration of silica called as frustules which are composed of two overlapping halves (the epitheca and the hypotheca). Shells of diatoms are highly resistant to decomposition due to the presence of silica and are deposited in ocean beds leading to the formation of the diatomaceous earth. Thus, the correct answer is option D.
  • Question 7
    1 / -0
    Which among the following is a good source of a natural dye of litmus? 
    Solution
    The species of the lichen Rocella is used for the extraction of the dye which serves in the formation of litmus. The litmus papers are used for testing of the pH. The litmus paper turns blue at alkaline pH and red at acidic pH. The change in the pH can be analysed using the litmus papers. 
    Thus, the correct answer is option C. 
  • Question 8
    1 / -0
    Lichens show the symbiotic association between
    Solution
    A lichen is a stable symbiotic association between a fungus and algae and/or cyanobacteria. The lichen symbiosis is thought to be a mutualism, as both the fungi and the photosynthetic partners, called as photobionts, benefit. The algal component photosynthesize and provide food for the fungus while the fungal component provide protection from the environment by its filament.
    Thus, the correct answer is option A.
  • Question 9
    1 / -0
    Lichens are important in the studies on atmospheric pollution because they
    Solution
    Lichens are used as the indicators of air pollution. These structures grow on tree bark and rocks. Air pollutants which are in the gaseous forms get dissolved in the rainwater, especially pollutants like SO$$_2$$ can damage lichens, and check them from growing. In places where lichens are not growing, it indicates that the air is heavily polluted with sulphur dioxide and other pollutants. 
    Thus, the correct answer is option C. 
  • Question 10
    1 / -0
    Which one of the following is not true for lichens?
    Solution
    Lichens are formed by the symbiotic association between algae and fungi and have a unique morphology distinct from both partners. Litmus is a blue dye extracted from various species of lichens especially Rocella tinctoria. Lichens are very sensitive to sulphur dioxide pollution in the air. If air is very badly polluted with sulphur dioxide there may be no lichens present. They are sensitive to sulphur dioxide, because their efficient absorption systems result in rapid accumulation of sulphur when exposed to high levels of sulphur dioxide pollution. The growth rate of lichen is very slow even less than a millimeter per year and this property is used to determine the age of exposed rock.
    So, the correct answer is option C.
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