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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.

Understand the statement and analyse the answer based on the given reason:

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

2. Phototropism in plants

Assertion:	Phototropism is a directional growth movement.
Reason:	It occurs in the direction of light.

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

3. Gibberellins and ethylene

Assertion:	Usage of ethylene on plants stimulates tremendous elongation of internodes.
Reason:	Ethylene induces bolting in plants.

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

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