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Absorption By Roots - The Process Involved

Question

A candidate in order to study the process of osmosis has taken 3 potato cubes and put them in 3 different beakers containing 3 different solutions. After 24 hours, in the first beaker the potato cube increased in size, in the second beaker the potato cube decresed in size and in the third beaker there was no change in the size of the potato cube. The following diagram shows the result of the same experiment:

i. Give the technical terms of the solution used in beaker 1, 2 and 3.
ii. In beaker 3 the size of the potato cube remains the same. Explain the reason in brief
iii. Write the specific feature of the cell sap of root hair a which helps in absorption of water.
iv. What is osmosis?
v. How does a cell wall and a cell membrane differ in their permeability?

Solution

i. The technical terms are ;
1. Hypotonic
2. Hypertonic
3. Isotonic

ii. The third beaker contains isotonic solution that is the concentration of the solution is the same as that of the potato cube, Thus, there is no osmosis taking place as there is no concentration gradient. Thus the cube remains the same as no water is taken or released.

iii. Cell sap is present at a higher concentration that that of the surrounding soil and thus it absorbs water through the process of osmosis.

iv. Osmosis – Is the process of the movement of the solvent molecule from the region of its higher concentration to the region of its lower concentration. Through a semi-permeable membrane.

v. Cell wall is freely permeable while cell membrane is semi-permeable

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Some More Questions From Absorption By Roots - The Process Involved Chapter

Match the items in column I with those in column II

Differentiate between the following pairs on the basis of what is mentioned within brackets:

i. Diffusion and osmosis (Definition)

Explain the following term

ii. Turgor pressure

A. An apparatus as shown below was set-up to investigate a physiological process in plants. The setup was kept in sunlight for two hours. Droplets of water were then seen inside the bell jar. Answer the questions that follows:

i. Name the process being studied.
ii. Explain the process named above in Q 3 a i.
iii. Why was the pot covered with a plastic sheet?
iv. Suggest a suitable control for this experiment.
v. Mention two ways in which this process is beneficial to plant.
vi . List three adaptations in plants to reduce the above mentioned process.

Differentiate between the following pairs on the basis of what is mentioned within brackets:

Turgor pressure and wall pressure (Explain)