EASY
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What happens to an animal cell when kept in a hypertonic solution?

Important Questions on Cell Membranes and Transport

MEDIUM
Which one of the following statements is NOT correct?
EASY
The water potential ψp of pure water at standard temperature and atmospheric pressure is:
MEDIUM
Define BOD. What is its significance in an aquatic ecosystem?
MEDIUM

Assertion (A): The flow of solvent molecules from a pure solvent to the solution through semipermeable membrane is osmosis.

Reason (R): Pure solvent molecules flow out of the solution through semipermeable membrane if a pressure larger than the osmotic pressure is applied to the solution side.

The correct answer is:

HARD
Which of the following elements is responsible for maintaining turgor in cells?
MEDIUM
What is biomagnification? Write two effects of biomagnification.
EASY

The containers X and Y have 1 litre of pure water and 1 litre of 0.1 M sugar solution, respectively. Which one of the following statements would be correct regarding their water potential Ψ and osmotic potential Ψs?

*Note: There were errors in original KVPY papers, and thus the options are modified here.

EASY
In an area where DDT has been used extensively, the population of birds declined significantly because -
EASY
Which of the following physico-chemical techniques is commonly used to desalinate brackish water?
HARD
What is biomagnification? List out the effects of biomagnification.
HARD
Explain the effects on the characteristics of a river when urban sewage is discharged into it.
EASY

Describe the events shown in the figure in terms of water potential.

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EASY
Give any five functions of plasma membrane found in prokaryotic cells.
EASY
Explain why water molecules can pass through visking tubing, but starch molecules cannot.