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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:	Plants lack a nervous system that helps control and coordinate the physiological processes.
Reason:	The control and coordination in plants are performed by chemical substances known as hormones.

Both A and R are false
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
Both, A and R, are true and R is the correct explanation of A

2. Phototropism in plants

Assertion:	Phototropism is caused by auxin.
Reason:	When light enters from one side of the plant, auxin diffuses towards the shady side of the shoot.

If A is false but R is true
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 true but R is false

3. Cytokinins and ABA

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