Tag: ascent of sap

Questions Related to ascent of sap

The phenomenon related to active water absorption is

botany water absorption and ascent of sap in plants factors affecting the transport of water and minerals in plants ascent of sap long distance transport of water

  1. Transpiration

  2. Root pressure

  3. Osmotic pressure

  4. Translocation

Show answer
Correct Option: B
Explanation:

 Root pressure is the force in root region that helps to drive water or sap upwards into tracheary elements of xylem. Water is absorbed through the root hairs from the soil. When during low transpiration there is no transpiration pull that time root pressure increases and water moves upwards in xylem elements. Root pressure is actively push up the water to small height in the stem.

So the correct answer is 'Root pressure '.

Choose the correct answers from the alternatives given :
In which of the following plants metabolism would be hindered if leaves are coated with vaseline on their upper surface ?

botany water absorption and ascent of sap in plants factors affecting the transport of water and minerals in plants ascent of sap long distance transport of water

  1. Pistia

  2. VaIlisneria

  3. Lotus

  4. Mango

Show answer
Correct Option: C
Explanation:

Lotus have stomata on the upper surface of its leaves. Hence, Coating of Vaseline on its upper surface will hinder transpiration. 

Mango is a terrestrial plant which has stomata in the lower surface of leaves. Hence transpiration will not be affected in mango because of coating Vaseline on the upper surface.
So, the correct answer is lotus.

Choose the correct answers from the alternatives given.
When a cell is placed in 0.5 M solution of salt and no change in the volume of the cell is observed; the concentration of cell sap would be

botany water absorption and ascent of sap in plants factors affecting the transport of water and minerals in plants ascent of sap long distance transport of water

  1. 0.5 M

  2. 0.05 M

  3. 5.0 M

  4. 50 M

Show answer
Correct Option: A
Explanation:

When the concentrations of both the solution (cell sap as well surrounding solution) are same, there is no net movement in the cell. Such solutions are called isotonic solutions. Since it is specified that no change in volume occurs it means that the concentration of the cell sap will be same as that of the concentration of salt.

Hence, the correct answer is '0.5 M'.