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Plant Growth and Development

Home > Botany > Plant Growth and Development

Q1. Ethylene exhibits its characteristic triple response in seedlings, which includes:

Inhibition of stem elongation, thickening of the stem, and horizontal growth.
Increased leaf expansion, root elongation, and faster seed germination.
Acceleration of flowering, increased transpiration, and decreased chlorophyll content.
Suppression of fruit ripening, promotion of seed dormancy, and increased stomatal closure.

Q2. Consider the two statements:

Assertion (A):	Gibberellins are used to increase the length of grape stalks.
Reason (R):	Gibberellins help overcome apical dominance.

Both(A)and(R)are True and(R)correctly explains(A).
Both(A)and(R)are True but(R)does not correctly explain(A).
(A)is True;(R)is False.
(A)is False;(R)is True.

Q3. All the following are functions of auxins in plants except:

They help to initiate rooting in stem cuttings.
They promote flowering e.g. in pineapples.
They help to prevent fruit and leaf drop at early stages.
They prevent the abscission of older mature leaves and fruits.