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Respiration in Plants Test - 16

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Respiration in Plants Test - 16
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  • Question 1
    1 / -0
    Foul smell in the water of tanks, ponds etc., is due to:
    Solution
    Organic loading is occurrence of excess organic matter inside water. Its putrefaction decreases dissolved oxygen. Anaerobic putrefaction or anaerobiosis produces pollutants like methane, hydrogen sulphide and ammonia. They kill aquatic plants and animals. The water body comes to have foul smell, brown colouration, bad taste and oil.
  • Question 2
    1 / -0
    The value of RQ at compensation point is 
    Solution
    • The respiratory quotient (RQ) is defined as the ratio of the volume of carbon dioxide released to the volume of oxygen utilized during the process of respiration. 
    • At the compensation point, there is no net exchange of gases in plants, that is, the release of $$O_2$$ in photosynthesis is equal to its utilization in respiration. 
    • Therefore, the exchange of $$CO_2$$ and $$O_2$$ is equal and RQ becomes one.

    Hence, the correct answer is '1'
  • Question 3
    1 / -0
    Which of the following respiratory material requires the highest numbers of $$O_{2}$$ molecules for its complete oxidation?
    Solution
    • Respiratory materials that are more oxidized require less number of oxygen for their complete oxidation. 
    • They have higher respiratory quotients. For example, glucose has high respiratory quotients. 
    • Similarly,  respiratory materials that are less oxidized require more number of oxygen for their complete oxidation. 
    • They have lower respiratory quotients. For example, fatty acids have low respiratory quotients. 
    • Triolein has the lowest respiratory quotients. It has an RQ of 0.7. 
    • RQ of malic acid, tartaric acid, and oleic acid are 1.3, 1.6, and 0.71 respectively.
    • Hence, triolein requires the highest number of oxygen molecules for its complete oxidation.

    Thus, the correct answer is 'Triolein'.
  • Question 4
    1 / -0
    Which of the following causes RQ to vary?
    Solution
    • The respiratory quotient is the value obtained by dividing the number of CO$$_{2}$$ molecules eliminated to that of O$$_{2}$$ molecules consumed. 
    • Most energy sources are food containing carbon, hydrogen, and oxygen such as fats, carbohydrates, and proteins. Therefore, the value of RQ depends on the respiratory substrate.

    So, the correct answer is 'Respiratory substrate'
  • Question 5
    1 / -0
    The correct relationship of value of respiratory quotient is
    Solution
    In the case of respiratory quotient, the more the amount of CO$$_2$$ eliminated and lesser the amount of O$$_2$$ consumed, more will be its value. In the case of fats it is generally the opposite and thus, have very less value (less than 1) for R.Q. Whereas hexose sugars like glucose have R.Q. = 1, because the volume of CO$$_2$$ and volume of O$$_2$$ stays the same. Organic acids will have their R.Q. values more than 1, because of the elimination of more CO$$_2$$ molecules than the consumption of Oxygen molecules.
    So, the correct answer is option D.
  • Question 6
    1 / -0
    R.Q. is more than one in which of the following case?
    Solution
    R.Q. is generally more in the case of organic acids. It is due to the reason that it eliminates more $$CO_2$$ than the $$O_2$$ consumed. E.g., in oxalic acid R.Q is 4.
    So, the correct answer is option D.
  • Question 7
    1 / -0
    In succulents respiratory quotient is always zero because of 
    Solution
    Respiratory quotient is defined as the ratio of carbon dioxide eliminated to that of oxygen consumed. Dark succulents undergo incomplete oxidation. When incomplete oxidation takes place, the value of R.Q. is zero. It is because during incomplete oxidation no carbon dioxide is released. Thus, the correct answer is option C.
  • Question 8
    1 / -0
    R.Q. of malic acid is
    Solution
    The ratio of the volume of carbon dioxide evolved to that of oxygen consumed by an organism, tissue, or cell in a given time. Generally organic acids have their R.Q. value greater than 1. Oxidation of malic acid is as follows-
    $$C_4H_6O_5 + 3O_2 \rightarrow 4CO_2 + 3H_2O$$
    R.Q. = 4$$CO_2$$/ 3$$O_2$$ = 1.33.
    So, the correct answer is option C.
  • Question 9
    1 / -0
    RQ is zero, when the respiratory substrate is 
    Solution
    Respiratory quotient is the ratio, which defined as the ratio between $$CO_2$$ eliminated to that of $$O_2$$ consumed. When respiratory substrate is incompletely oxidized the value of R.Q. = 0. In succulent plants like Opuntia the carbohydrate is incompletely oxidized and do not produce any $$CO_2$$. So, $$CO_2$$ / $$O_2$$ = 0 / no. of $$O_2$$ = 0.
  • Question 10
    1 / -0
    In germinating castor seeds the R.Q is
    Solution
    Respiratory substrate is fat in the case of germinating of castor seeds. Fats generally have an R.Q. value less than 1. It is because of more oxygen consumed than the number of $$CO_2$$ eliminated.
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