Tag: transport of water in plants

Questions Related to transport of water in plants

J.C.Bose supported 

botany water absorption and ascent of sap in plants apoplast and symplastic pathway transport of water in plants water transport

  1. The ascent of sap takes place due to cohesive force.

  2. The ascent of sap takes place due to adhesive force.

  3. The ascent of sap takes place due to pulsatory activity of living cell.

  4. None of the above.

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Correct Option: C
Explanation:

The movement of water in the plants is known as the ascent of the sap. This upward movement is due to the pulsatory activity of the living cell. This theory was supported by J. C. Bose. he explained that there is rhythmic form of pulse-like movement which helps the water to be transported in the upward direction. 

Thus, the correct answer is option C. 

Which of the following statements was supported by Westermaier?

botany water absorption and ascent of sap in plants apoplast and symplastic pathway transport of water in plants water transport

  1. The upward conduction of water is provided by cohesive force.

  2. The upward conduction of water is provided by xylem parenchyma cells.

  3. The upward conduction of water is provided by pulsatory action of living cells.

  4. None of the above.

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Correct Option: B
Explanation:

There are several vital theories which help in understanding the concept of the conduction of water by xylem. Westermaier explained the theory that the upward conduction of water is due to xylem parenchyma cells. The tracheids and the vessels act as water reservoirs. This allows the movement of the water in upward direction. 

Thus, the correct answer is option B. 

Which part helps the plant absorb water and mineral from the soil?

botany water absorption and ascent of sap in plants apoplast and symplastic pathway transport of water in plants water transport

  1. Root hairs

  2. Roots

  3. Root cap

  4. Tap root

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Correct Option: A
Explanation:

Tap root is a type of roots which has a major big central root and small branching. These go very deep in the soil and are very strong.

Root cap helps the root to grow in length by cell division.
Roots are the general organs of the plants that absorb water but more specifically it is the root hair present on the root that significantly increase the surface area available for absorption of water and minerals.
So, the correct answer is 'Root hairs'.

Water in plants is transported by or ascent of sap takes place through 

botany water absorption and ascent of sap in plants apoplast and symplastic pathway transport of water in plants water transport

  1. Cambium

  2. Phloem

  3. Xylem

  4. Epidermis

Show answer
Correct Option: C
Explanation:
Xylem contributes in ascent of sap by the following phenomena.
1) The rate of transpiration is high. 
2) The water is lost from guard cell which leads to decrease in the water potential of guard cell as compared to the surrounding cell. 
3) To stabilize the water potential in the guard cell water rushes from the neighbouring cell which creates a cohesion pull in the xylem vessels to pull the water up to the guard cell. 
So, the correct answer is option C.

Ascent of sap is

botany water absorption and ascent of sap in plants apoplast and symplastic pathway transport of water in plants water transport

  1. Upward movement of water in the plant.

  2. Downward movement of organic nutrients.

  3. Downward and upward movement of water in the plant.

  4. Redistribution of inorganic substances in the plant.

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Correct Option: A
Explanation:
  • Down to upwards movement is known as ascent and Top to downwards movement is known as descend.
  • In plants sap is water and minerals.
  • Ascent of sap in the xylem tissue of plants is the upward movement of water and minerals from the root to the top. 

The gridling or ringing experiment to prove that the water moves through the xylem vessels was performed by

botany water absorption and ascent of sap in plants apoplast and symplastic pathway transport of water in plants water transport

  1. Stocking

  2. Malpighi

  3. Molisch

  4. Askenasy

Show answer
Correct Option: B
Explanation:

This experiment was introduced by Malpighi in 1675. It involves the removal of a ring of bark (girdle), that is, all tissues outside the vascular cambium. Thus, the correct answer is (B).

The transport of sap from root to top of the plant is

botany water absorption and ascent of sap in plants apoplast and symplastic pathway transport of water in plants water transport

  1. Ascent of sap

  2. Conduction

  3. Transport

  4. Translocation

Show answer
Correct Option: A
Explanation:

When any material movement is from down to upwards it is called as ascending movement.

When material movement is from top to downwards it is called as descending movement.
The upward movement of water and minerals from the root to the top of the plant is called as ascent of sap. Plants absorb water through the root hairs and transpire through leaves. The water moves from the root to the tip portion of the plant body against the force of gravity by transpiration pull.

Sir J.C. Bose proposed a theory of ascent of sap known as 

botany water absorption and ascent of sap in plants apoplast and symplastic pathway transport of water in plants water transport

  1. Pulsation theory

  2. Transpiration pull theory

  3. Relay pump theory

  4. Capillary force theory

Show answer
Correct Option: A
Explanation:

Sir J.C. Bose proposed a theory of ascent of sap known as pulsation theory. The pulsation theory states that water is absorbed by the plants due to the metabolic activity of living cells which are in constant state of rythmatic pulsation. But it was not accepted as water can be passively absorbed by the roots even the cells were dead.

So, the correct answer is option A.

Transportation is helpful to plants in 

botany water absorption and ascent of sap in plants apoplast and symplastic pathway transport of water in plants water transport

  1. Cooling

  2. Loss of excess nutrients

  3. Upward conduction/ascent of sap

  4. Loss of excess water

Show answer
Correct Option: C
Explanation:

Transportation is the process involving the transfer of materials from one place to another place.

(A)In plants, cooling occurs through transpiration.
(B)Plants loss excess nutrients and water through their aerial parts.
(C)Transportation helps in the ascent of sap or food.
(D)Transpiration is the loss of excess water.
So, the correct answer is 'Upward conduction/ ascent of sap'.

According to the vital force theory, ascent of sap is due to active pulsation of the innermost layer of cortex. This theory was given by 

botany water absorption and ascent of sap in plants apoplast and symplastic pathway transport of water in plants water transport

  1. J. C. Bose

  2. Dixon

  3. Strasburger

  4. Sachs

Show answer
Correct Option: A
Explanation:

According to the vital force theory, ascent of sap is due to active pulsation of the innermost layer of cortex. This theory was given by J.C Bose. The pulsation theory states that water is absorbed by the plants due to the metabolic activity of living cells which are in constant state of rythmatic pulsation. But it was not accepted as water can be passively absorbed by the roots even when the cells were dead.

So, the correct answer is option A.