Apical dominance - Auxin; Reversal of dwarfism - Gibberellins

True

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False

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Solution

The correct option is A True
Auxins are present in high concentrations in the tip of apical bud and their presence inhibits the growth of lower buds and branches. Thus one shoot becomes the tallest stem and other remain lower. This type of growth shown by apical bud in herbaceous plants is known as apical dominance.
The major function of gibberellins is stem elongation causing the plants to grow taller. Gibberellins are responsible for increase in the internodal length in some genetically dwarf varieties such as Pea, Maize.
Thus, the correct answer is option A.

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Similar questions

Q. Apical dominance is the function of Auxin.

Identify the pair that is correctly matched from the given.

Auxin – cell division
Gibberellin – internodal elongation
Cytokinin – fruit ripening
Ethylene – apical dominance

Q. Which statements are correct?

a

- Cytokinins suppress the synthesis of chlorophyll

b

- Auxins control apical dominance

c

- Gibberellins promote shoot elongation

d

- Abscisic acid enables seeds to with-stand desication.

Auxin induces apical dominance which is supression of apical buds.

Pick out the correct statements.
I. Cytokinins especially help in delaying senescence.
II. Auxins are involved in regulating apical dominance.
III. Ethylene is especially useful in enhancing seed germination.
IV. Gibberellins are responsible for immature falling of leaves.

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