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
A.
(i) only
Uniporter is an integral membrane protein that is involved in facilitated diffusion. They can be either ion channels or carrier proteins.
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
What is the direction of movement of sugars in phloem?
Upward
Downward
Bi-directional
Non-multidirectional
