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Doctors Medicines MCQs Q&A

Consider the following pairs. S.No Plant hormone Function 1. Auxin Cell elongation of stems and roots 2. Gibberellin Induces parthenocarpy 3. Cytokinin Stimulate the formation of chloroplast in leaves Which among the above pairs is/are correct?

Consider the following pairs. S.No Plant hormone Function 1. Auxin Cell elongation of stems and roots 2. Gibberellin Induces parthenocarpy 3. Cytokinin Stimulate the formation of chloroplast in leaves Which among the above pairs is/are correct? Correct Answer All pairs are correct

The correct answer is All pairs are correct.

Key Points

  • Auxin:
    • They are involved in cell growth and cell expansion.
    • It is produced in the stem tip that promotes cell elongation. (pair 1 correct)
    • The concentration of auxin is highest at the top of the plant and decreases as one gets closer to the roots.
  • Gibberellin:
    • ​It stimulates elongation of the stem, flowering and germination.
    • It also induces parthenocarpy, i.e. the production of fruits without the fertilisation of ovules. (pair 2 is correct)
  • Cytokinin:
    • ​It promotes lateral and adventitious shoot growth and used to initiate shoot growth in culture.
    • It also stimulates the formation of chloroplast in leaves. (pair 3 is correct)
  • Abscisic acid:
    • It is a growth-inhibiting hormone.
    • It is also called “stress hormone” as it increases tolerance of plants.
    • It inhibits plant metabolism.
  • Ethylene:
    • It acts as a growth promoter as well as an inhibitor.
    • It is widely used for ripening fruits and for the production of more flowers and fruits.

Additional Information

  • Plant hormones are regulators of almost all aspects of plant development and plant responses to their environment.
    • These hormones are produced in almost all parts of the plant and play an important role in the processes like vernalisation, phototropism, seed germination, dormancy etc.
    • They are derivatives of indole (auxins), terpenes (Gibberellins), adenine (Cytokinins), carotenoids (Abscisic acid) and gases (Ethylene). 

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