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Biology
Plant Growth and Development
NCERT Solutions
NCERT Solutions
Plant Growth and Development
10 Solutions
Q1
Exercises
Define growth, differentiation, development, dedifferentiation, redifferentiation, determinate growth, meristem and growth rate.
Q2
Exercises
Why is not any one parameter good enough to demonstrate growth throughout the life of a flowering plant?
Q3
Exercises
Describe briefly:
(a)
Arithmetic growth
(b)
Geometric growth
(c)
Sigmoid growth curve
(d)
Absolute and relative growth rates
Q4
Exercises
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.
Q5
Exercises
Why is abscisic acid also known as stress hormone?
Q6
Exercises
'Both growth and differentiation in higher plants are open'. Comment.
Q7
Exercises
'Both a short day plant and a long day plant can produce can flower simultaneously in a given place'. Explain.
Q8
Exercises
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.
Q9
Exercises
Would a defoliated plant respond to photoperiodic cycle? Why?
Q10
Exercises
What would be expected to happen if:
(a)
G
A
3
GA_3
G
A
3
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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