Normally, when the seeds are mature, ethylene production increases and builds-up within the fruit, resulting in a climactic event that means:

 

1.	A sudden spurt of growth	2.	Leaf expansion
3.	Rise in respiratory rate	4.	Death of radicle

Which PGR is used to initiate flowering and for synchronizing fruit set in pineapple?

Which PGR stimulates the closure of stomata in the epidermis and increases the tolerance of plants to various kinds of stress?

In most situations, which PGR acts as an antagonist to GAs?

The site of perception of light/dark duration in plants is:
1. Root apex                 
2. Shoot apex
3. Flower                     
4. Leaves

Match the following :

Options:

The term synergistic action of hormones refers to
1. When two hormones act together but bring about opposite effects.
2. When two hormone act together and contribute to the same function.
3. When one hormone affects more than one function.
4. When many hormones bring about any one function.

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