25. In conifers the water uptake is not much efficient because

(a)  Such plants are acquired much of height

(b)  They have poorly developed or entirely absent root hairs

(c)   Their roots are much branched

(d)  All the above

Ans. (b)      In orchids, aerial roots are found which have velamen tissue, this tissue is able to convert water vapour into water drops from air.

(63)