Self Studies
Self Studies
Self Studies
Self Studies
Selfstudy
Selfstudy

Plant Growth and Development Test - 42

Result Self Studies

Plant Growth and Development Test - 42
  • Score

    -

    out of -
  • Rank

    -

    out of -
TIME Taken - -
Self Studies

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Self Studies Self Studies
Weekly Quiz Competition
  • Question 1
    1 / -0
    Which plant hormone help in active absorption of water?
    Solution
    Auxin is synthesized at the shoot and root tips and is responsible for tropic growth in plants. This hormone controls phototropism as well as geotropism. Auxin enters the root cells and makes it more elastic. As a result the absorption of water by root increases. Thus the correct answer is option A.
  • Question 2
    1 / -0
    Which hormone is used to induce ripening in banana?
    Solution
    Ehtylene is a simple gaseous plant growth regulator. It is synthesized in large amounts by tissues undergoing senescence and ripening of fruits. It enhances the respiration rate during ripening of fruit. This rise in rate of respiration is called as respiratory climacteric. 
    Exposure of plants to ethylene causes drooping of leaves and flowers, a phenomenon known as epinasty.
    Thus, the correct answer is option B.
  • Question 3
    1 / -0
    Richmond-Lang effect is shown by
    Solution
    Kinetins are a type of phytohormone (cytokinin). One of the important physiological effect of cytokinins is that they delay senescence. This delay in senescence of mature plant parts is known as Richmond Lang effect.
    Thus, the correct answer is option C.
  • Question 4
    1 / -0
    Hormone which breaks seed dormancy is
    Solution
    Gibberellins are inducers of hydrolytic enzymes like alpha amylase which helps mobilize the reserve food starch stored in cotyledons or endosperms. Thus, gibberellins induce seed germination.
    Therefore, the correct answer is option B.
  • Question 5
    1 / -0
    Which one of the following is not a synthetic auxin?
    Solution

    Solution:

    • Correct answer is option D

    • Explanation for the correct option
    • Auxins are growth promoting phytohormones. Indoleacetic acid (IAA) is a natural plant auxin. 
    • The 2,4-dichlorophenoxyacetic acid (2, 4-D) and 2,4,5-trichlorophenoxyacetic acid (2, 4, 5-T) are artificial auxins used as weedicides. 
    • Naphthalene acetic acid (NAA) is also an artificial auxin widely used in agriculture.
  • Question 6
    1 / -0
    Which plant hormone causes fruit ripening?
    Solution
    During the early 20th century, scientists observed that the gas ethylene (C$$_2$$H$$_4$$) has several effects on plant growth, but not until 1934 did they demonstrate that plants produce ethylene. This natural hormone influences many plant processes. Ethylene inhibits cell elongation, promotes seed germination, promotes apical dominance and is involved in plant responses to wounding or invasion by disease causing microorganisms. Ethylene also has a major role in many aspects of senescence, including fruit ripening. As a fruit ripens, it produces ethylene, which triggers an acceleration of the ripening process. This induces the fruit to produce more ethylene, which further accelerates ripening.
    Thus, the correct answer is option C.
  • Question 7
    1 / -0
    Which among the following is a synthetic plant hormone?
    Solution

    Synthetic plant hormones are synthetic growth inhibitors which have a pronounced effect on the growth and development of plants. 2 morphactins, flurenol and chloroflurenolmethyl are well known. Morphactins in combination with 2, 4- D have been found to be effective weedicides. Synthetic auxins are extensively used as herbicides, the most widely known being 2, 4-D and the notorious 2, 4, 5-T, which were used in a 1:1 combination as agent orange during the Vietnam war and sprayed over the Vietnam forests as a defoliant. Thus, the correct answer is option C.

  • Question 8
    1 / -0
    Ethylene gas is used for 
    Solution
    Ethylene is a simple gaseous plant growth regulator (PGR). It is synthesised in large amounts by tissues undergoing senescence and ripening fruits. Influences of ethylene on plants include horizontal growth of seedlings, swelling of the axis and apical hook formation in dicot seedlings. Ethylene promotes senescence and abscission of plant organs especially of leaves and flowers. Ethylene is highly effective in fruit ripening. It enhances the respiration rate during ripening of the fruits. This rise in rate of respiration is called as respiratory climacteric.
    Thus, the correct answer is option C.
  • Question 9
    1 / -0
    Which of the following plant hormone is extracted from fungus?
    Solution
    Gibberellins were discovered from diseased rice seedlings. The bakane (foolish seedling) is a disease of rice seedlings, was caused by a fungal pathogen; Gibberalla fujikuroi. Japanese scientist, E. Kurosawa reported the appearance of symptoms of the disease in uninfected rice seedlings when they were treated with sterile filtrates of the fungus. The active substances were later identified as gibberellic acid (gibberellin).
    Thus, the correct answer is option B.
  • Question 10
    1 / -0
    Highest concentration of auxin is found in 
    Solution
    Auxins (from Greek auxein: to grow) was first isolated from human urine. The term auxin is applied to the indole-3-acetic acid (IAA) and to other natural and synthetic compounds having certain growth regulating properties. They are generally produced by the growing apices of the stems and roots, from where they migrate to the regions of their action.
    Thus, the correct answer is option A.
Self Studies
User
Question Analysis

  • Correct -

  • Wrong -

  • Skipped -

My Perfomance
  • Score

    -

    out of -
  • Rank

    -

    out of -
Re-Attempt Weekly Quiz Competition
Self Studies Get latest Exam Updates
& Study Material Alerts!
No, Thanks
Self Studies
Click on Allow to receive notifications
Allow Notification
Self Studies
Self Studies Self Studies
To enable notifications follow this 2 steps:
  • First Click on Secure Icon Self Studies
  • Second click on the toggle icon
Allow Notification
Get latest Exam Updates & FREE Study Material Alerts!
Self Studies ×
Open Now