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Subjects
Science CBSE
Class 10
Control and coordination
Control and coordination in plants

19. Movements and hormones in plants

Exercise condition:

5 m.

Assertion and reason type questions:

1. Plant hormones:

Assertion:	Application of cytokinin to marked vegetables can keep them fresh for several days.
Reason:	Cytokinins delay senescence of leaves and other organ by mobilisation of nutrients.

Both A and R are false
Both, A and R, are true and R is the correct explanation of A
Both, A and R, are true but R is not the correct explanation of A
If A is false but R is true
If A is true but R is false

2. Phototropism in plants

Assertion:	Apical dominance is the supression of the growth of axillary buds.
Reason:	Apical dominance is due to the effect of downward movement of auxin from the apical region to lower side.

Both, A and R, are true and R is the correct explanation of A
Both, A and R, are true but R is not the correct explanation of A
Both A and R are false
If A is false but R is true
If A is true but R is false

3. Cytokinins and ABA

Assertion:	Application of cytokinins promotes the Richmond Lang effect.
Reason:	Application of auxins promotes delays ageing in plants.

Both, A and R, are true and R is the correct explanation of A
If A is false but R is true
If A is true but R is false
Both, A and R, are true but R is not the correct explanation of A

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