Q11
1 markMCQSection A

In plants the role of cytokinin is :

Control and Coordination
Plant Hormones

Options

(a)Promote cell division.
(b)Wilting of leaves.
(c)Promote the opening of stomatal pore.
(d)Help in the growth of stem.
Official Answer

The correct option is (a).

cytokinincell divisionplant hormonegrowth promoter

Marking Scheme

  • 11 mark for selecting the correct option (a).

Hint

Think of the prefix 'cyto-' which refers to cells (as in cytology), and 'kinin' which relates to division (kinesis).

Quick Oral Answer

Cytokinin is a plant hormone whose primary role is to promote cell division, especially in areas of active growth like fruits and seeds.

Analysis & Explanation

Analysis of Options:

  • Option (a) is correct: Cytokinins are plant hormones that promote rapid cell division. They are present in greater concentrations in areas of rapid cell division, such as in developing fruits and seeds.
  • Option (b) is incorrect: Wilting of leaves is a growth-inhibiting effect caused by the plant hormone Abscisic Acid (ABA).
  • Option (c) is incorrect: The opening of the stomatal pore is not the primary, defining function of cytokinin taught in the Class 10 curriculum; its primary role is promoting cell division.
  • Option (d) is incorrect: Gibberellins and auxins are primarily responsible for helping in the growth of the stem.

Common Mistakes

  1. 1Confusing the function of cytokinin with gibberellins (stem elongation) or abscisic acid (wilting of leaves).

Interesting Facts

Cytokinins were first discovered when researchers found that autoclaved herring sperm DNA strongly stimulated plant cell division in culture media.

Spotted a mistake or something unclear?

Tell us — we fix reported answers fast.

Frequently Asked Questions

How many marks does this question carry in CBSE Class 10 Science 2023?

This question carries 1 mark in the CBSE Class 10 Science 2023 examination.

Which chapter does this question come from in Science?

This question is from the chapter "Control and Coordination" in the CBSE Class 10 Science syllabus.

What topic does this question cover in Science?

This question covers the topic "Plant Hormones" from CBSE Class 10 Science.

What type of question is this in the CBSE Class 10 Science 2023 paper?

This is a MCQ question from Section A in the CBSE Class 10 Science 2023 paper.