Name________________________
Date________________________
THIRD BOLOGY
DIFFUSION, OSMOSIS AND ACTIVE TRANSPORT
SECTION A
Instructions
Question 1- 10 are multiple choice, circle the correct answers, (1 mark each)
(1) Which one of the following structures is described as being semi – permeable?
A. Cell Wall
B. Chloroplasts
C. Cell Membrane
D. Starch Grain
(2) What substance is the cell wall of the plants made of?
A. Glucose
B. Proteins
C. Cellulose
D. Starch
(3) Which one of the following structures is responsible for determining an
organism’s characteristics?
A. Cytoplasm
B. Chloroplast
C. Chromosomes
D. Mitochondria
(4) Which one of the following is responsible for the release of energy from the cell?
A. Chloroplast
B. Chromosomes
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C. Mitochondria
D. Cell Membrane
(5) The movement of molecules from a high concentration to a low concentration of
the same molecules is called
A. Osmosis
B. Diffusion
C. Active Transport
D. Mass Flow
(6) Which statement is NOT correct:
A. Molecules tend to distribute themselves evenly throughout the space they
occupy.
B. Molecules and ions are constantly on the move.
C. Molecules move only in one direction.
D. An increase in temperature results in an increase in movement
(7) For osmosis to occur there must be a :
A. Permeable membrane
B. Solution
C. Concentration gradient
D. Random movement of molecules.
(8) Diffusion allows the movement of all of the following EXCEPT:
A. Oxygen
B. Carbon dioxide
C. Blood cells
D. Nutrients
(9) Which of the following processes is responsible for the movement of minerals
from the soil into plant roots?
A. Filtration
B. Diffusion
C. Osmosis
D. Active Transport
(10)
The diagram below shows a cell from the epidermis of an onion. Which
part allows some, but not all, substances to pass into and out of the cell?
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Figure 1
SECTION B
(1)
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4
5
6
(2)
Explain what a hypertonic, hypotonic and isotonic solution is.
3marks
(d) Using the words turgid and flaccid and plasmolysis. Explain what will happen to a
plant cell when placed in a hypotonic and hypertonic solution.
5 marks
(e) Explain what will happen if an animal cell is placed in a hypotonic and hypertonic
solution.
4 marks
TOTAL 37 MARKS
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