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NCERT solutions Biology Class 11 chapter 15 Plant Growth and Development


NCERT Biology Class 11

Biology Textbook for Class 11

Chapter 15 - Plant Growth and Development

Pages 253 - 254

Define growth

Q 1.1 | Page 253

Define differentiation

Q 1.2 | Page 253

Define Development,

Q 1.3 | Page 253

Define Redifferentiation

Q 1.5 | Page 253

Define determinate growth

Q 1.6 | Page 253

Define Growth rate

Q 1.7 | Page 253

Define Meristem

Q 1.7 | Page 254

Why is not any one parameter good enough to demonstrate growth throughout the life of a flowering plant?

Q 2 | Page 253

Describe briefly Arithmetic growth

Q 3.1 | Page 253

Describe briefly Geometric growth

Q 3.2 | Page 253

Describe briefly Sigmoid growth curve

Q 3.3 | Page 253

Define De-differentiation

Q 3.4 | Page 253

Describe briefly Absolute and relative growth rates

Q 3.4 | Page 253

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 4 | Page 253

What do you understand by photoperiodism and vernalisation? Describe their significance

Q 5 | Page 254

Why is Abscisic acid also known as stress hormone?

Q 6 | Page 254

Both growth and differentiation in higher plants are open’. Comment.

Q 7 | Page 254

Both a short day plant and a long day plant can flower simultaneously in a given place. Explain.

Q 8 | Page 254

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.

Q 9 | Page 254

Would a defoliated plant respond to photoperiodic cycle? Why?

Q 10 | Page 254

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 11 | Page 254

NCERT Biology Class 11

Biology Textbook for Class 11