Tag: water absorption organ

Questions Related to water absorption organ

The cells of the roots contain cell sap at a .................. concentration than that of surrounding soil water.

biology absorption by roots - the processes involved manure manures and fertilisers water absorption organ

  1. Higher

  2. Lower

  3. Equal

  4. All of the following

Show answer
Correct Option: A
Explanation:

The cells of the roots contain cell sap (solution) at a higher concentration than that of surrounding soil water. As a result, the water is absorbed by the root hairs. This is because the water always travels from a region of high water potential to the region of lower water potential. Here, the soil possesses a higher water potential as compared to the root hair.

Mineral absorption occurs.

biology absorption by roots - the processes involved manure manures and fertilisers water absorption organ

  1. If soil solution is hypotonic

  2. If soil solution is hypertonic

  3. Independent of water potential

  4. Independent of water absorption

Show answer
Correct Option: D

Rupture and fractionation of water column present in tracheary elements does not occur during ascent of sap due to

biology absorption by roots - the processes involved manure manures and fertilisers water absorption organ

  1. Transpiration pull

  2. Weak gravitational pull

  3. Cohesion and adhesion

  4. Lignified thick walls

Show answer
Correct Option: C
Explanation:

Transpiratioal or gravitational pull exert strain so they are factors that can cause rupture of the column. 

Lignified walls are only present for structural support.
Cohesion ( attraction of water molecules towards each other) and adhesion (attraction of water molecules and the walls of the tube ) is the reason why  the column doesn't break as these attractive forces overcome the strain developed by Transpiration pull. 
So the correct answer is 'Cohesion and adhesion'.

In root hair, water enters due to.

biology absorption by roots - the processes involved manure manures and fertilisers water absorption organ

  1. Diffusion

  2. WP

  3. T.P.

  4. O.P.

Show answer
Correct Option: A

If a cell A with OP $10$ bars and TP $4$ bars is connected to cells B, A and D having OP and TP respectively $4$ and $4$, $10$ and $5$ and $7$ and $3$ bars, the flow of water will be.

biology absorption by roots - the processes involved manure manures and fertilisers water absorption organ

  1. C to A, B and D

  2. B to A, C and D

  3. D to A, B and C

  4. A to B, C and D

Show answer
Correct Option: A

Which of the following elements are most readily mobilised?

biology absorption by roots - the processes involved manure manures and fertilisers water absorption organ

  1. Phosphorus, sulphur, nitrogen and potassium

  2. Calcium, sulphur, nitrogen and phosphorus

  3. Phosphorus, sulphur, nitrogen and calcium

  4. Potassium, sulphur, nitrogen and calcium

Show answer
Correct Option: A
Explanation:

Phosphorus, sulphur, nitrogen and potassium most readily mobilise while calcium is structural component which is not remobilised.