Q. Cuscuta climbs up with the help of loop formation around the support. This type of movement is called :
(a)Nutation
(b)Nastic movement
(c)Hygroscopic movement
(d)None of the above
Solution :
Correct option : A (a) Nastic movements are non-directional responses to stimuli and are usually associated with plants. (b) The movement can be due to changes in turgor or changes in growth. (c)Nastic movements differ from tropic movements in that the direction of tropic responses depends on the direction of the stimulus, whereas the direction of nastic movements is independent of the position of the stimulus. So, option A is correct.