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 any support which they happen to touch and wind around that support. It is observed that organ R originates 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?

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Solution

(i) R is a leaf tendril and (ii) S is a stem tendril.

Tendrils are the thin, thread-like growths on the stems or leaves of climbing plants and are considered as the climbing organ.

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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 any support which they happen to touch and wind around that support. It is observed that organ R originates 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?

(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.

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

(a) chemotropism

(b) nastic movement

(d) geotropism

Q. 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 any support which they happen to touch and wind around that support. It is observed that organ R originates from the leaves of the plant whereas organ S originates directly from the stem of the plant.

(c) Name the stimulus involved in this case.

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Flora and Fauna

Standard VII Chemistry

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(i) R is a leaf tendril and (ii) S is a stem tendril. Tendrils are the thin, thread-like growths on the stems or leaves of climbing plants and are considered as the climbing organ.

(i) R is a leaf tendril and (ii) S is a stem tendril.

Tendrils are the thin, thread-like growths on the stems or leaves of climbing plants and are considered as the climbing organ.