When a molecule moves across a membrane independent of other molecules the process is called

(i) Uniport

(ii) Symport

(iii) Antiport

• (i) only

• (i) and (ii) only

• (i) and (iii) only

• (ii) and (iii) only

• (ii) and (iii) only

Apopalstic movement of water occurs exclusively through the

(i) Intercelluar spaces

(ii) Walls of the cells

(iii) Plasmodesmata

(iv) Cytoplasm

• (i), (ii) and (iv) only

• (iii) and (iv) only

• (i) and (ii) only

• (ii) and (iv) only

• (ii) and (iv) only

Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following

• flaccidity of buliform cells

• shrinkage of air spaces in spongy mesophyll

• tyloses in vessels

• closure of stomata

104.

What is the direction of movement of sugars in phloem?

• Upward

• Downward

• Bi-directional

• Non-multidirectional