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The climbing organs of plants like tendr...

The climbing organs of plants like tendrils grow towards any suppory which they happen to touch and wind around the support. This is an example of:

A

chemotropism

B

nastic movement

C

thigmotropism

D

geotropism

Text Solution

Verified by Experts

The correct Answer is:
C
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P and Q are two types of plants having weak stems which cannot stand upright on their own. The plants P and Q have organs R and S respectively which can grow towards and support which they happen to touch and wind around that support. It is observed that organ R originated from the leaves of the plant whereas organ S originates directly from the stem of the plant. (a) What is (i) R, and (ii) S? (b) What is the name of growth movement exhibited by the organs R and S? (c) Name the stimulus involved in this case. (d) State whether the behaviour of organs R and S is a tropic movement or a nastic movement. (e) Name one plant like P and another plant like Q.

Fill in the following blanks: (a) A plant's response to light is called........ (b) A plant's response to gravity is called..... . (c) Plant shoot grows upward in response to....... (d) Plant roots grow downward in response to ....... (e) Tendrils wind around a support in response to ........ (f) Plant roots grow towards.... and in the direction of force of ........ (g) A root of a plant grows downward. This is knows as......... (h) ......is the hormone that causes phototropism in plants (i) The response of leaves to the sunlight is called ...............

Knowledge Check

  • The twinning of tendrils around a support is a good example of

    A
    Photoperiodism
    B
    Chemotropism
    C
    Nastic movements
    D
    Thigmotropism

  • Coiling of graden pea tendrils around any support is an example of

    A
    thigmotaxis
    B
    thigmonasty
    C
    thigmotropism
    D
    thermotaxis

  • A sensitive thread-like structure which can coil around a support is

    A
    Spring
    B
    Tendril
    C
    Rachis
    D
    Twiner.

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