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The Cell and Its Environment - SS1 Biology Past Questions and Answers - page 1

1

__________ refers to the movement of molecules or ions from an area of higher concentration to an area of lower concentration, across a semi-permeable membrane or within a fluid medium.

A

diffusion

B

osmosis

C

plasmolysis

correct option: a

diffusion

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2

__________ refers to the movement of solvent molecules (usually water) across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

A

diffusion

B

osmosis

C

1.     hemolysis

correct option: b

osmosis

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3

In a biological system, when the solute concentration inside and outside the cell is the same, the solution is said to be ________

A

isotonic

B

hypotonic

C

hypertonic

correct option: c

isotonic

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4

A situation when a cell swells and potentially bursts is known as _______

A

Hypolysis

B

lyse

C

Neurolysis

correct option: b

lyse

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5

What are the key differences between plasmolysis and lyse

(a) Plasmolysis is a situation where cells shrink whilst lyse is a situation where cells

(b) Plasmolysis takes place in hypertonic solutions whilst lyse occurs in hypotonic solutions.

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