What are the control points where a plant adjusts the quantity and types of solutes that reach the xylem?
1. Suberin deposited casparian strips
2. Transport proteins of endodermal cell
3. Sclerenchyma around the pericycle
4. The root hairs themselves
Substances which are soluble in lipids…….a…...But which have a hydrophilic moiety……..b……
1. a- move slowly
2. a- move similarly as that of others
3. b- move faster
4. a- move faster
Molecules moves across a membrane independent of other molecules, by the means of membrane protein, the process is called
Osmotic pressure is the
(1) Pressure required to stop the water diffusing in
(2) Function of solute concentration
(3) More the solute, more is the pressure needed to stop endosmosis
(4) All of these
In germination of seed, what is absorbent?
(1) Seed
(2) Water
(3) Environment
(4) Seedling
Mass flow or bulk flow system is the movement of substances in bulk or en masse from one point to another point as a result of
(1) Pressure Difference between two points
(2) Osmotic gradient between two points
(3) Concentration gradient between two points
(4) Cannot be predicted
Most of the movement in roots through apoplast is due to
(1) Cortical cells are loosely packed and hence no resistance to water movement
(2) Endodermal cells are loosely packed and hence no resistance to water movement
(3) Pericycle cells are loosely packed and hence no resistance to water movement
(4) Medullary cells are loosely packed and hence no resistance to water movement
Elements most readily mobilized are
1. P, S and Ca
2. N, K and P
3. N, P and Fe
4. S, Zn and P
Rate of diffusion of substances is affected by all, except
1. Gradient of concentration
2. Temperature but not pressure
3. Density
4. Both temperature and pressure
The cell gets swell up, when placed in
1. Hypertonic solution
2. Hypotonic solution
3. Ultratonic solution
4. Isotonic solution