ICSE Class 10 Biology Competency Focused Practice Questions Solution:
Fill in the Blank (1 mark each)
Question 22
Osmosis is controlled by the concentration of …………… molecules.
Answer:
Osmosis is controlled by the concentration of water molecules.
Question 23
An animal cell is kept in a lower solute concentration fluid. The cell will …………… . (Enlarge / Shrink)
Answer:
An animal cell is kept in a lower solute concentration fluid. The cell will enlarge.
Question 24
Plants absorb water from the roots because the cell sap is …………… (more, less) concentrated than the surrounding fluids.
Answer:
Plants absorb water from the roots because the cell sap is more concentrated than the surrounding fluids.
Question 25
Human red blood cells, when kept in a hypertonic solution, …………… occurs. (Osmosis, endosmosis, exosmosis)
Answer:
Human red blood cells, when kept in a hypertonic solution, exosmosis occurs.
Question 26
Given below is an experimental setup. Read the information given below the diagram and answer the questions from 26-30.
Concentrated sugar solution is taken in the thistle funnel. The mouth of the thistle funnel is covered with cellophane paper. The thistle funnel is inverted in a beaker containing water.
The above experiment demonstrates …………… .
Answer:
The above experiment demonstrates osmosis .
Question 27
After a few hours, the level of the sugar solution …………… in the thistle funnel.
Answer:
After a few hours, the level of the sugar solution increases in the thistle funnel.
Question 28
It allows only …………… molecules to pass through it freely.
Answer:
It allows only water molecules to pass through it freely.
Question 29
It prevents the passage of …………… molecules.
Answer:
It prevents the passage of sugar molecules.
Question 30
A control experiment can be set up by taking plain …………… in the thistle funnel and placing it in another beaker containing water.
Answer:
A control experiment can be set up by taking plain water in the thistle funnel and placing it in another beaker containing water.
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