The bending of root of a plant in response to water is called _________ 

(a)

thigmonasty

(b)

phototropism

(c)

hydrotropism

(d)

photonasty

The root of the plant is __________.
i) positively phototropic but negatively geotropic
ii) positively geotropic but negatively phototropic
iii) negatively phototropic but positively hydrotropic
iv)negatively hydrotropic but positively phototropic

(a)

(i) and (ii)

(b)

(ii) and (iii)

(c)

(iii) and (iv)

(d)

(i) and (iv)

The non-directional movement of a plant part in response to temperature is called ________.

(a)

thermotropism

(b)

Thermonasty

(c)

chemotropism

(d)

thigmonasty

During photosynthesis plants exhale _______. 

(a)

Carbon dioxide

(b)

oxygen

(c)

hydrogen

(d)

helium

A plant is kept in a dark room for about 24 hours before conducting any experiment on photosynthesis in order to _______.

(a)

remove chlorophyll from the leaf

(b)

remove starch from the leaves

(c)

ensure that photosynthesis occurred

(d)

to prove transpiration