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Class 11 Biology NCERT Solutions For Chapter 15 Plant Growth and Development

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Download NCERT Solutions for Class 11 Biology

Chapter 15 Plant Growth and Development

(Link of Pdf File is given below at the end of the Questions list)

In this pdf file you can see answers of following Questions

 

Question 1:
Define growth, differentiation, development, dedifferentiation, redifferentiation, determinate growth, meristem and growth rate.
Question 2:
Why is not any one parameter good enough to demonstrate growth throughout the life of a flowering plant?
Question 3:
Describe briefly:
(a) Arithmetic growth
(b) Geometric growth
(c) Sigmoid growth curve
(d) Absolute and relative growth rates
Question 4:
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.
Question 5:
What do you understand by photoperiodism and vernalisation? Describe their significance.
Question 6:
Why is Abscisic acid also known as stress hormone?
Question 7:
‘Both growth and differentiation in higher plants are open’. Comment.
Question 8:
‘Both a short day plant and a long day plant can flower simultaneously in a given place’. Explain.
Question 9:
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.
Question 10:
Would a defoliated plant respond to photoperiodic cycle? Why?
Question 11:
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.

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