(A) The movement in the leaves of $Mimosa \text{ } pudica$ (touch-me-not plant) upon touching is known as seismonasty or thigmonasty.This is a non-dir

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(A) The movement in the leaves of $Mimosa \text{ } pudica$ (touch-me-not plant) upon touching is known as seismonasty or thigmonasty.This is a non-directional movement in response to a mechanical stimulus (touch).It occurs due to the sudden loss of turgor pressure in the pulvinus cells at the base of the leaflets.Therefore, the correct answer is $A$ (Seismonasty).

Class 11 Biology Plant Growth and Development Mix Examples-Plant Growth and Development

Easy

On touching the leaves of $Mimosa \text{ } pudica$ droop down because of:

A
Seismonasty
B
Hydrotropism
C
Chemonasty
D
Thigmotropism

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Column $I$	Column $II$
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On touching the leaves of $Mimosa \text{ } pudica$ droop down because of:

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Describe the following plant growth regulators:
$(1)$ Gibberellins
$(2)$ Cytokinins

Match the following:

Column $I$ Column $II$

$a.$ Auxin $(i)$ Root hair formation

$b.$ Cytokinin $(ii)$ Seed development

$c.$ Ethylene $(iii)$ Xylem differentiation

$d.$ $ABA$ $(iv)$ Nutrient mobilisation