Class 11 Biology - Chapter Plant Growth and Development NCERT Solutions | Which one of the plant growth regulators
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Question 9
Which one of the plant growth regulators would you use if you are asked to:
Which one of the plant growth regulators would you use if you are asked to:
(a) Induce rooting in a twig
(b) Quickly ripen a fruit
(c) Delay leaf senescence
(d) Induce growth in axillary buds
(e) Bolt a rosette plant
(f) Induce immediate stomatal closure in leaves.
Answer
(a) Induce rooting in a twig – Auxins
(b) Quickly ripen a fruit – Ethylene
(c) Delay leaf senescence – Cytokinins
(d) Induce growth in axillary buds – Cytokinins
(e) ‘Bolt’ a rosette plant – Gibberellic acid
(f) Induce immediate stomatal closure in leaves – Abscisic acid
More Questions From Class 11 Biology - Chapter Plant Growth and Development
- Q:- What would be expected to happen if:
(a) GA3 is applied to rice seedlings
(b) Dividing cells stop differentiating
(c) A rotten fruit gets mixed with unripe fruits
(d) You forget to add cytokinin to the culture medium. - Q:- Describe briefly:
(a) Arithmetic growth
(b) Geometric growth
(c) Sigmoid growth curve
(d) Absolute and relative growth rates - Q:- What do you understand by photoperiodism and vernalisation? Describe their significance.
- Q:- Why is Abscisic acid also known as stress hormone?
- Q:- List five main groups of natural plant growth regulators. Write a note on discovery, physiological functions and agricultural/horticultural applications of any one of them.
- Q:- Both a short day plant and a long day plant can flower simultaneously in a given place. Explain.
- Q:- Both growth and differentiation in higher plants are open. Comment.
- Q:- Would a defoliated plant respond to photoperiodic cycle? Why?
- Q:- Define
(a) Growth
(b) Differentiation
(c) Development
(d) De differentiation
(e) Re differentiation
(f) Determinate growth
(g) Meristem
(h) Growth rate. - Q:- Why is not any one parameter good enough to demonstrate growth throughout the life of a flowering plant?
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List the hormones secreted by the following:
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