Question

Study the following cells of Hydra?
(1) nerve cells
(2) sensory cells
(3) nematocyst
(4) gastrodermal cells
(a) only '2'
(b) only '1'
(c) '1'and'2'
(d) '3'and'4'

Answer 1

study all
importance sequence is..3;4;2;1
all are important
you shouldn't leave any one of them