study the diagrams given below and answer the following questions. a.) name the structures shown in X and Y in the figures (A) and (B), respectively. b.) write the functions performed by The structures X and Y. c.) name the phenomenon depicted and define it. d.) how do the structures X and Y differ from each other. e.) give examples of the plant which show the said phenomenon.
Answers
a.) X is a stem tendril and Y is a leaf tendril.
b.) They help in holding weak stemmed plants like climbers upright.
c.) The phenomenon depicted is thigmotropism. Thigmotropism means moment of the plant in response to touch.
d.) X arises from an axillary bud and Y arises directly from the branch of the plant.
e.) X is found in vitis and passiflora etc and Y is found in pea, sweet pea and wild pea etc.
X: Stem tendrils, Y: Leaf tendrils.
(ii) Functions : Stem and leaf tendrils enable the plant to climb up a support.
(iii) Thigmotropism is depicted here in the figure. It is the growth movement of plant parts in response to touch stimulus.
(iv) Stem tendrils arise from the stem while leaf tendrils arise from the leaf of the plant.
(v) Sweet pea, vines and Cuscuta.