Plasticity in plant growth means that
1. Plant roots are extensible
2. Plant growth is dependent on the environment
3. Stems can extend
4. None of the above

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R): 

In the light of the above statements choose the correct answer from the options given below:

Assertion: At root tips the cells of the zone of elongation attain their maximal size in terms of wall thickening and protoplasmic modifications.
Reason: The zone of elongation is the most proximal zone at the root tip.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false

In the light of the above statements choose the correct answer from the options given below:

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):

In the light of the above statements choose the correct answer from the options given below:

Assertion: Seeds on the ground under deciduous plants are more apt to germinate in the spring.
Reason: Phytochrome is involved in the germination of the seeds in deciduous plants.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false

Assertion: Etiolation is an energy conserving strategy in plants.
Reason: It helps plants growing in the dark reach the light before they die.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false

Assertion: Many plant biologists prefer the term ‘plant growth regulator’ rather than ‘plant hormone’ to describe organic compounds that modify or control one or more physiological processes within a plant.
Reason: Plant hormones do not activate a signal transduction pathway.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false

Assertion: Auxin, produced predominantly in shoot tips, is transported from cell to cell down the stem and this is called as polar transport.
Reason: The polar transport is due to the gravitational forces.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false

Assertion: Over a certain concentration range, Auxin stimulates elongation of cells within young developing shoots.
Reason: In shoot’s region of elongation, auxin stimulates the plasma membrane proton pumps.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false