Tag: absorption by roots - the processes involved

Questions Related to absorption by roots - the processes involved

Aquatic plants lose most of their metabolic wastes by .......... process.

bio-chemistry absorption by roots - the processes involved diffusion transport across membrane means of transport

  1. Diffusion

  2. Osmosis

  3. Reverse osmosis

  4. Dialysis

Show answer
Correct Option: A
Explanation:

Aquatic plants lose most of their metabolic wastes by diffusion directly into the water, surrounding them as the concentration of that metabolic wastes is more in the cell as compared to the surroundings. They do not have to store the waste products as terrestrial plants do. Thus, the correct answer is option A.

Name the process which is useful for the movement of substances like CO$ _2$ and O$ _2$ across the cell membrane.

bio-chemistry absorption by roots - the processes involved diffusion transport across membrane means of transport

  1. Diffusion

  2. Osmosis

  3. Active diffusion

  4. Reverse osmosis

Show answer
Correct Option: A
Explanation:

CO$ _2$ and O$ _2$ are gases so, they move in and out of the cell by diffusion. Diffusion is a process in which the gaseous molecules spreads, due to their kinetic energy and movement of molecules is from higher concentration to lower concentration. 

Which is incorrect ?

bio-chemistry absorption by roots - the processes involved diffusion transport across membrane means of transport

  1. Rate of diffusion is directly proportional to concentration.

  2. Rate of diffusion is inversely proportional to concentration.

  3. Diffusion is movement of particles from low to high electrochemical potential.

  4. Example of diffusion is opening of scent or ammonia in one corner.

Show answer
Correct Option: C
Explanation:

Diffusion is the movement of water molecules from higher concentration to lower concentration. It also transfers the molecule along the electrochemical potential gradient.

So, the correct answer is 'Diffusion is the movement of particles from low to high electrochemical potential.'

The given table shows properties of four cells systems A, B, C and D. The maximum rate of inward diffusion of water will be observed in which of these systems?

System Intracellular concentration of water  Extracellularconcentration of water
A 0.09 M 0.11 M
B 0.2 M 0.5 M
C 0.05 M 0.6 M
D 0.03 M 0.7 M
bio-chemistry absorption by roots - the processes involved diffusion transport across membrane means of transport

  1. System A

  2. System B

  3. System C

  4. System D

Show answer
Correct Option: C
Explanation:

A.In the system A, inward diffusion of water takes place with slow rate

B. In the system B, inward diffusion of water takes place with medium rate.

C.In the system C, inward diffusion of water takes place with maximum rate

D.In the system D, inward diffusion of water takes place with high rate

So, the correct option is ‘System C’.

The factor which does not affect the rate of alveolar diffusion is

bio-chemistry absorption by roots - the processes involved diffusion transport across membrane means of transport

  1. solubility of gases

  2. thickness of the membranes

  3. pressure gradient

  4. reactivity of the gases.

Show answer
Correct Option: D
Explanation:

$O _{2}$ and $CO _{2}$ are exchanged in the alveoli by simple diffusion. The factors that affect the diffusion are pressure gradient of the gases, solubility of the gases and the thickness of the membranes involved in diffusion.