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.

Answer

(a) (i) Leaf tendril (ii) Stem tendril (b) Thigmotropism (c) Touch (of support) (d) Tropic movement (e) Organs like P (lead tendrils): Pea plant; Organs like Q (stem tendrils): Bitter gourd plant