Question
Briefly exlpain protein carrier molecules
Solution
(a) Protein carrier molecules : Carrier proteins facilitate the diffusion of different molecules, to which they have specificity, one molecule at the time is allowed to bind to carrier protein and is released on the other side of the membrane. These are present in plasmalemma. These molecules take energy from ATP molecules and then pick up mineral molecules from the soil and carry them inward and release into cytoplasm. 
Mineral absorption through carrier molecules
