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Plant Physiology Test - 7

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Plant Physiology Test - 7
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  • Question 1
    1 / -0
    What is imbibition?
    Solution
    Imbibition is the displacement of one fluid by another immiscible fluid.
  • Question 2
    1 / -0
    Metabolism will be adversely affected when the leaves are coated with wax on their upper surfaces in which of the following plants?
    Solution
    Metabolism will be adversely affected when the leaves are coated with wax on their upper surfaces in lotus. The reason is the upper surface is above the water and receives sunlight and air directly in contact with the atmosphere.
  • Question 3
    1 / -0
    The ripening of fruits can be accelerated by which of the following methods?
    Solution
    The ripening of fruits can be accelerated by artificial exposure of developing fruits to ethylene.
  • Question 4
    1 / -0
    Which chemical is present in the cell-sap of the members of compositae family?
    Solution
    The cell sap in members of compositae has a unique chemical known as insulin.
  • Question 5
    1 / -0
    Which of the following is/are required for auxin synthesis?
    Solution
    Auxin is a plant hormone produced in the stem tip that promotes cell elongation. Lower concentrations of zinc increased both plant growth and the biosynthesis of tryptophan and auxins. lndole-3-acetic acid (IAA), the most important natural auxin in plants, is mainly synthesized from the amino acid tryptophan (Trp). Zinc is required for the activity of carbonic anhydrase, auxin (Indole acetic acid, IAA) biosynthesis. Zinc is also an activator of certain carboxylases and dehydrogenases. It has also been reported that zinc deficiency induces oxidative environment, which results in degradation of auxin.
  • Question 6
    1 / -0
    In phosphorus deficiency, the first leaves which become yellow are
    Solution
    In phosphorus deficiency, the first leaves to become yellow are mature leaves at the base.
  • Question 7
    1 / -0
    Which of the following is never a limiting factor for photosynthesis?
    Solution
    Oxygen is never a limiting factor for photosynthesis. It means that the quantity of oxygen does not affect the rate of photosynthesis.
  • Question 8
    1 / -0
    The Starch cannot move from cell to cell: how does it accumulate in the potato tubers?
    Solution
    This option is correct. It is translocated in the form of sugar, which on accumulating in tubers are enzymatically converted into starch.
  • Question 9
    1 / -0
    One of the following gases was absent in the past and came into the atmosphere with the coming of the green plants on earth. Which was that element?
    Solution
    Oxygen was absent in the past and came into the atmosphere with the coming of the green plants on earth.
  • Question 10
    1 / -0
    Which of the following is a device for growing plants in a controlled environment?
    Solution
    Phytotron is a device for growing plants in controlled environment. A phytotron is an enclosed research greenhouse used for studying interactions between plants and the environment. Here, plants can be grown on a large scale in a range of rigidly controlled conditions of light, temperature of air and soil, humidity and composition of air water and nutrient content of soil
  • Question 11
    1 / -0
    Opening and closing of stomata in angiosperms is due to which of the following phenomenon?
    Solution
    Opening and closing of stomata in angiosperms is due to changes in turgor pressure of guard cells. As the turgor pressure of the guard cells changes, the opening and closing of stomata occurs.
  • Question 12
    1 / -0
    In which of the following processes is light energy converted to chemical energy?
    Solution
    In photosynthesis, light energy is converted to chemical energy.
  • Question 13
    1 / -0
    When simple sugar is formed in the leaves it is _________.
    Solution
    When simple sugar is formed in the leaves it is transported.
  • Question 14
    1 / -0
    What do you mean by girdling of plant?
    Solution
    Girdling of the plant is complete removal of a strip of bark (consisting of cork cambium, phloem, cambium and sometimes going into the xylem) from around the entire circumference of either a branch or trunk of a woody plant.
  • Question 15
    1 / -0
    Organic substances such as sugars translocated in the phloem, can be demonstrated by __________.
    Solution
    Organic substances such as sugars translocated in the phloem, can be demonstrated by ringing the stem.
  • Question 16
    1 / -0
    Which of the following is a growth inhibitor?
    Solution
    Ethylene is a growth inhibitor.
  • Question 17
    1 / -0
    Gibberellins do not _________.
    Solution
    Gibberellins are a group of plant hormones responsible for growth and development. They are important for initiating seed germination . Low concentrations can be used to increase the speed of germination, and they stimulate cell elongation so plants grow taller. They are naturally produced by barley and other seeds. Gibberellins (GAs) affect flowering in a species-dependent manner: in long-day and biennial plants they promote flowering, whereas in other plants, including fruit trees, they inhibit it.
  • Question 18
    1 / -0
    Which is the circadian rhythmic nastic movement of higher plants in response to the onset of darkness?
    Solution
    Nyctinasty is the circadian rhythmic nastic movement of higher plants in response to the onset of darkness.
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