Tag: absorption by roots - the processes involved

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

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

  1. Diffusion

  2. Osmosis

  3. Reverse osmosis

  4. Dialysis
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. Diffusion

  2. Osmosis

  3. Active diffusion

  4. Reverse osmosis
Reveal answer Fill a bubble to check yourself
A Correct answer
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. 

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

Which is incorrect ?

  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.
Reveal answer Fill a bubble to check yourself
C Correct answer
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.'

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

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

  1. System A

  2. System B

  3. System C

  4. System D
Reveal answer Fill a bubble to check yourself
C Correct answer
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’.

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

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

  1. solubility of gases

  2. thickness of the membranes

  3. pressure gradient

  4. reactivity of the gases.
Reveal answer Fill a bubble to check yourself
D Correct answer
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.