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Assertion: Auxins promote apical dominan...

Assertion: Auxins promote apical dominance by suppressing the activeity of lateral buds.
Reason : In Moriculture , periodic pruning of shoot tips is done to make mulberry plants bushy.

A

If both the assertion and the reason are true and the reason is a correct explanation of the assertion.

B

If both the assertion and reason are true but the reason is not a correct explanation of the assertion

C

If the assertion is true but the reason is false

D

If the assertion and reason is false but reason is true

Text Solution

Verified by Experts

The correct Answer is:
A
(a) Auxin is produced by shoot tip and acts as a growth promoter for apical bud and inhibit the growth of lateral buds. When a terminal bud is removed, the nearest axillary buds begin to grow and the plant branches rapidly. In case of mulberry plants, pruning is done to remove apical dominance and cause more branching of the main body of the plant.
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Assertion The shoot apical meristems are the only source of auxin synthesis. Reason Dormancy of lateral buds over apical buds is due to auxin.

Assertion : Decapitation is widely used in tea plantation and hedge-making. Reason : Removal of shoot tips usually results in the growth of lateral buds.

Knowledge Check

  • Statement a. Auxins promote apical dominance by suppressing activity of lateral buds. Statement b. In moricultrue, periodic pruning of shoot tips is done to make Mulberry plants bushy.

    A
    a and b correct with a being reason for b
    B
    a is correct, b is wrong
    C
    a is wrong, b is correct
    D
    Both a and b correct but a is not reason for b.

  • Assertion: The apical bub is the only source of auxins Reason: Removal of apical bud promotes lateral bud growth.

    A
    If both the assertion and the reason are true and the reason is a correct explanation of the assertion.
    B
    If both the assertion and reason are true but the reason is not a correct explanation of the assertion
    C
    If the assertion is true but the reason is false
    D
    If the assertion is false but reason is true

  • Assertion : Auxillary buds, in actively growing herbaceous plants, generally remain dormant Reason :This is due to apical dominance which is under the influence of auxins

    A
    If both Assetion and Reason are true and the Reason is a correct explanation of the Assertion
    B
    If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion
    C
    If Assertion is true but the Reason is false
    D
    If both Assertion and Reaon are false

    • Similar Questions

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    The following statements are given about different plant growth hormones : I. Cytokinin suppresses the synthesis of chlorophyll. II. Auxins control apical dominance. III. Gibberellins promote shoot elongation. IV. Abscisic acid enables seeds to withstand desication. Which of the above statements are correct?

    (i) Promote nutrient mobilisation (ii) Overcome the apical dominance (iii) Lateral shoot growth All the above physiological effects are related to which of the following plant growth regulators?

    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 desiccation.

    [A]: Auxillary buds, in actively growing herba- ceous plants generally, remain dormant. [R]: This is due to apical dominance which is under the influence of auxins

    Consider the following statements and select the correct option stating which one is true(T) and which one is false (F) i) Vemalisation can help in shortening the juvenile or vegetative period of plant and bring early flowering ii) Phytochrome is a pigment protein complex which exists in two inter-convertible forms - P_r and P iii) Sugar beet flowers after getting the inductive cycle of long dark periods and short photoperiods iv) 2,4-D acts as weedicide to remove broad leaved weeds. V) Auxins promote growth of lateral buds whereas cytokinins inhibit it

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