BIOMOLECULES AND ENZYMES

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BIOLOGY

HORMONES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Under certain conditions, seeds need to prevent growth of a new plant, for example, when there is a drought and a new plant would not survive. Which hormone is involved in making seeds dormant?
A
Gibberellin
B
Auxin
C
Cytokinin
D
ABA
Explanation: 

Detailed explanation-1: -Plant hormones, mainly abscisic acid (ABA) and gibberellin (GA), are the major endogenous factors that act antagonistically in the control of seed dormancy and germination; ABA positively regulates the induction and maintenance of dormancy, while GA enhances germination.

Detailed explanation-2: -Abscisic acid (ABA) is the sole plant hormone known to maintain seed dormancy; it acts through a gene expression network involving the transcription factor ABSCISIC ACID INSENSITIVE 3 (ABI3).

Detailed explanation-3: -Fruit growth is mainly dependent on auxin and cytokinin.

Detailed explanation-4: -Seed dormancy can be defined as the state or a condition in which seeds are prevented from germinating even under the favourable environmental conditions for germination including, temperature, water, light, gas, seed coats, and other mechanical restrictions.

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