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Cells, Difusion & Osmosis Questions
(a) This student is examining plant cells.
This shows the students labeled diagram of one of the plant
cells.
V a c u o l e
C h l o r o p l a s t s
C y t o p l a s m
N u c l e u s
C e l l m e m b r a n e
C e l l w a l l
Complete each, of the following sentences.
(i) The cell wall is made of
.....................................................................
.
(ii) The function of the cell wall is to
........................................... the cell.
(iii) Chloroplasts contain
........................................... which is needed for
...................................... .
(i) The acuole contains .......................................
which is mostly water.(5
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(b) This student is inestigating en!ymes.
(i) "hat is the temperature of the water in the bea#er$
................................... %C(1
(ii) "hat does an en!yme do$
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................(2
(iii) &n!ymes hae many uses. 'or example they are used in
some washing powders. ietwo examples of other uses for which
en!ymes, or products containing en!ymes, are
sold.
.
.....................................................................................................................
*.
....................................................................................................................(2
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(c) +n en!yme is used in a chemical reaction. The graph shows
the speed of the reaction at
different temperatures.
, p e e do f
r e a c t i o n
' a s t
, l o w
- . % C T e m p e r a t u r e
(i) Complete the following sentence in your own words.
+t - %C the reaction
........................................................................................
...........................................................................................................................(1
(ii) "hat ma#es you thin# that this en!yme could wor# well in
the human body.$
...........................................................................................................................
...........................................................................................................................(1
(Total 12 marks)
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The drawing below shows a light/sensitie (receptor) cell from
the eye. The structures labeled +, 0 and C,
can be found in most animal cells.
A
B
C
(a) Name the structures labeled +, 0 and C.
+
.................................................................................
0
.................................................................................
C
.................................................................................(3
(b) 1escribe, as fully as you can, what happens in the nerous
system when this receptor cell is
stimulated by light.
.....................................................................................................................................
.....................................................................................................................................
.....................................................................................................................................
.....................................................................................................................................(3
(Total 6 marks)
