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Control and Coordination Test 31

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Control and Coordination Test 31
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  • Question 1
    1 / -0
    GH promotes :
    Solution
    Growth hormone is a 191-amino acid, single-chain polypeptide that is synthesized, stored and secreted by somatotropic cells within the lateral wings of the anterior pituitary gland. GH is a stress hormone that raises the concentration of glucose and free fatty acids.growth hormone promotes the growth of bones, muscles and various other organs, too much of it causes abnormal growth of all these tissues, a condition that is referred to as gigantism when it applies to children and acromegaly when it applies to adults. It synthesizes protein also.
  • Question 2
    1 / -0
    Geotropic response of root is due to
    Solution
    Auxin is a plant hormone that plays important role in the growth of stem and roots to gravity. Gravitropism is a plant growth response to gravity. Root shows positive gravitropism and shoot shows negative gravitropism. Auxin content is lower on the upper side and more concentration occurs in lower side of the root and stem. This stimulates stem elongation and thus stem grows upwards. In roots, higher growth on upper side occurs due to lower auxin content. This inhibits root elongation and thus root grows downwards showing geotropic response. 
    Thus, the correct answer is option B.
  • Question 3
    1 / -0
    Leaves of touch-me-not plant fold in response to:
  • Question 4
    1 / -0
    Tendrils and twiners come in contact with their support by means of
    Solution
    Nutation is the bending movements shown by some plant parts due to the unequal rate of growth of different parts of plants. Thigmonasty is the nastic response of a plant to touch. The movements of tentacles of Drosera when comes in contact with insect is due to thigmonasty. The movement of plant part in response to contact with a solid touch is called as thigmotropism. The curvature movements due to support seen in tendrils and twiners is an example of thigmotropism. The movement of parts of a plant in response to air current is called as anemotropism. 
    Thus, the correct answer is option C.
  • Question 5
    1 / -0
    More concentration of auxin in horizontally placed plants, under the influence of gravity, occurs in
    Solution
    Auxin is a plant hormone that plays important role in the growth of stem and roots to gravity. Gravitropism is a plant growth response to gravity. Root shows positive gravitropism and shoot shows negative gravitropism. When plant is placed horizontally, more concentration occurs in lower side of the root and stem. This stimulates stem elongation and thus stem grows upwards. This inhibits root elongation and thus root grows downwards. 
    Thus, the correct answer is option B.
  • Question 6
    1 / -0
    Movement caused by injury is
    Solution
    The movement of plant part as a result of injury is called as traumatropism. It this, due to injury or wound, plant changes its orientation. Growth of plant part in response to the current of water is called as rheotropism. Folding of leaves in response to injury is called as traumonasty. 
    Thus, the correct answer is option A.
  • Question 7
    1 / -0
    Klinostat is employed in the study of
    Solution
    Clinostat is a device which is used in the study the rate of growth in plant. It uses rotation to negate the effects of gravitational pull on plant growth and development. It is also used to study the effects of microgravity on cell cultures and embryos.
    Thus, the correct answer is option B.
  • Question 8
    1 / -0
    Tendrils exhibit/twining of tendrils is due to
    Solution
    The movement of plant part in response to contact with a solid touch is called as thigmotropism. The twining movements due to support seen in tendrils and twiners is an example of thigmotropism. Seismonasty is the nastic response of a plant to touch or vibration. Dropping of leaves of Mimosa pudica upon touching is due to seismonasty. Heliotropism is a growth movement or bending of stem in the direction of the light. It is also called as solar tracking. Diageotropism is plant part response to the gravity such that it grows horizontal to the gravity.
    Thus, the correct answer is option A.
  • Question 9
    1 / -0
    Hormones used to speed up malting in barley, promote flowering in pineapple and delaying leaf senescence in plants are------------------ respectively.
    Solution

    • Gibberellin regulates a wide range of processes involved in plant growth, organ development, and environmental responses. Hence, it is used in the brewery industry to speed up the malting process of barley.
    • Auxin induces the synthesis of ethylene, resulting in the flowering of pineapples. 
    • Cytokinin is a plant hormone that stimulates cell division and delays senescence in leaves. 

    Thus, the correct answer is option C.

  • Question 10
    1 / -0
    Choose the correct answer from the alternatives given.
    The plant hormone that causes cell elongation is:
    Solution
    Plant cells elongate irreversibly only when load-bearing bonds in the walls are cleaved. Auxin causes the elongation of stem and coleoptile cells by promoting wall loosening via cleavage of these bonds. This process may be coupled with the intercalation of new cell wall polymers.
    So, the correct option is 'indole 3-acetic acid'.
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