Name
KS3 Bio EQ 7A 2010 to 1995 Cells 4Teachers 126marks
Q8.
The diagrams below represent what happens to the energy in the food eaten by a
herbivore and a carnivore.
The width of each pathway indicates the amount of energy gained or used in a
particular way.
(a)
(i)
What percentage of the total energy, taken in by a herbivore, is stored in its
tissues? Use the diagram to help you answer.
................ %
1 mark
(ii)
The energy stored in an animal’s tissues is passed on to the next animal in the
food chain.
Use information in the diagrams above to explain why there are usually no more
than four or five stages in a food chain.
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1 mark
(b)
Respiration takes place in cells, in structures called mitochondria. Why do muscle
cells contain large numbers of mitochondria?
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1 mark
(c)
Cows eat plants, but cannot digest the cellulose cell walls.
Micro-organisms in the cow’s stomach are able to digest the plant cell walls.
Suggest why cows cannot digest the cell walls but micro-organisms can.
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1 mark
Patrick Brannac
www.SmashingChemistry.com
Page 1 of 8
(d)
The diagram below shows cells from the inner lining of a mammal’s intestine.
The cell membranes in contact with the food are folded.
Explain why it is an advantage that these cells are adapted in this way.
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2 marks
Maximum 6 marks
Q9.
The diagram below shows details of Chlamydomonas which is a single-celled
organism adapted for living in ponds and ditches.
(a)
Explain how the eyespot, the flagella and the chloroplast enable Chlamydomonas to
photosynthesise.
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3 marks
Patrick Brannac
www.SmashingScience.org
Page 2 of 8
(b)
(i)
Water diffuses into Chlamydomonas from the pond. Water is also produced by
respiration inside the cell.
Give one function of water inside the cell.
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1 mark
(ii)
If there is too much water in the Chlamydomonas cell, the water collects in two
small vacuoles. The vacuoles can contract to get rid of the water.
What effect does extra water have on the cell?
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1 mark
(c)
Large numbers of Chlamydomonas cells are found in ponds rich in nitrates. Nitrates
are a source of nitrogen.
What compound does Chlamydomonas make from nitrogen?
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1 mark
Maximum 6 marks
Q10.
The drawing shows part of a blackberry plant.
(a)
Photosynthesis takes place in the leaves of the blackberry plant. Complete the word
equation for photosynthesis.
water + carbon dioxide
........................................ + oxygen
1 mark
(b)
Jonathan studied a blackberry plant growing in a shady place and a blackberry plant
growing in a sunny place.
(i)
Jonathan found that the plant in the shady place had larger leaves. Why is it
an advantage for plants in the shade to have leaves with a large surface
area?
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1 mark
Patrick Brannac
www.SmashingScience.org
Page 3 of 8
(ii)
Both blackberry plants had green leaves. What part of the leaf cells makes the
leaf green?
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1 mark
(c)
The diagram below shows a cell from a leaf of a blackberry plant.
The names of four parts of the cell are listed in the table below.
(i)
part
Match the name of each part with a letter from the diagram. Write your
answers in the table.
letter of part
cell wall
cytoplasm
nucleus
vacuole
4 marks
(ii)
Which two of the labelled parts are also present in an animal cell? Give the
correct letters from the diagram.
.......................... and ..........................
2 marks
Maximum 9 marks
Q11.
The drawing shows a plant called Tillandsia.
(a)
(i)
The leaves of this plant absorb light.
Why do plants need light?
1 mark
Patrick Brannac
(ii) Tillandsia plants grow on the high branches of
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Page 4 of 8
trees in rain forests.
These plants cannot grow well on the lowest branches.
Explain why.
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1 mark
(b)
Tillandsia plants do not have root hairs on their roots.
What two substances do most plants absorb through their root hairs?
1. ................................................................................................................
2. ................................................................................................................
2 marks
(c)
Which diagram below shows a root hair?
Tick the correct box.
A
B
C
D
1 mark
Maximum 5 marks
Patrick Brannac
www.SmashingScience.org
Page 5 of 8
Q12.
(a)
The diagrams below show an animal cell and a plant cell.
(i)
The lines from the boxes show the positions of two of the parts that are
present in both cells.
In the boxes, write the names of these two parts.
2 marks
(ii)
Give the names of two parts which are present in plant cells but not in animal
cells.
1. ...........................................
2. ...........................................
2 marks
(b)
Organs can carry out their functions because of the special cells they have.
Draw a straight line from the name of each type of cell to the function of the cell and
then to the process it carries out.
One has been done for you.
Patrick Brannac
www.SmashingScience.org
Page 6 of 8
3 marks
Maximum 7 marks
Mark Scheme
M8.
(a) (i)
10
accept answers from 7 to 13
chloroplast’
1
1
(ii) any one from
• only some or 10% of the energy intake is
passed on to the
next level in the food chain
• only some or 10% of the energy is stored in
tissues
• some energy is wasted at each stage
• less energy is passed on to the carnivore
consequential marking applies
accept the percentage given in part (a) (i)
1
(b) (i)
any one from
• it is a solvent
• for photosynthesis
• it maintains the shape of the cell
• it provides a medium for chemical reactions
to take place
• it is a constituent of cytoplasm
accept ‘it is part of cytoplasm’
1
(ii) it dilutes the cytoplasm
accept ‘it makes the cell swell up’ or ‘it makes
the cell turgid’
1
(b) a lot of energy is needed for muscle
contraction
1
(c) any one from
• a cow cannot produce the correct enzyme
• micro-organisms produce the correct
enzyme or cellulase
(c) any one from
• protein
• amino acids
• enzymes
accept any correct nitrogen-containing
compound
1
(d)
1
any one from
• more absorption takes place
• absorption takes place more efficiently
• absorption takes place more quickly
1
(a)
M10.
(a) glucose
accept ‘sugar’ or ‘carbohydrate’
1 (L6)
[6]
M9.
1
[6]
folds increase the surface area
(b) (i)
to absorb enough or more light
accept ‘to absorb as much light as possible’
accept ‘to absorb lots of light’
accept ‘more photosynthesis takes place’
light is detected by the eyespot
1
the flagella are used to move towards light
1 (L6)
(ii) chloroplasts
accept ‘chlorophyll’
1
the chloroplast absorbs light
accept ‘the photosynthesis takes place in the
Patrick Brannac
1 (L6)
(c)
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(i)
part
letter of part
Page 7 of 8
cell wall
cytoplasm
nucleus
vacuole
D
F
A
C
4 (L5)
(ii) any two from
• A
• E
• F
2 (L5)
[9]
M11.
(a) (i)
any one from
• to make food or glucose or sugar or starch
• photosynthesis
accept ‘for growth’
1 (L3)
(ii) any one from
• there is not enough light
accept ‘no light’ or ‘no Sun’
• there is less light
accept ‘light cannot reach them’
do not accept ‘because plants need light’
3 (L6)
[7]
M13.
(a) (i)
C and E
answers may be in any order
both answers are required for the mark
1 (L6)
1 (L3)
(b) any two from
• oxygen
• water
• minerals or nutrients
accept a named mineral such as ‘nitrate’
accept for two marks two named minerals such
as ‘nitrates’
and ‘phosphates’
2 (L4)
(c) B
if more than one box is ticked, award no mark
1 (L4)
[5]
M12.
(a) (i)
accept ‘membrane’
cell membrane
1 (L6)
cytoplasm
answers must be in the correct order
(ii)
C
1 (L6)
(iii) any one from
to trap or absorb light photosynthesis
accept ‘to make glucose or sugar
or starch or carbohydrate or food’
1 (L6)
(b)
(i)
A
1 (L6)
(ii) any one from
• windpipe
• trachea
• airways
• bronchus
• bronchiole
• oviduct or fallopian tube
accept ‘lungs’
1 (L6)
1 (L6)
(ii) any two from
• cell wall
• chloroplast
accept ‘chlorophyll’
• large vacuole
accept ‘vacuole’
2 (L6)
(b)
if more than one line is drawn from any cell or
function,
award no mark for those linkages
(iii) to remove mucus
accept ‘to remove bacteria’
accept ‘to move mucus along’
accept ‘to move or remove bacteria or dust
particles’
‘it is a self cleaning mechanism’ is insufficient
do not accept ‘they clean dust or bacteria out
of the lungs
‘accept ‘to move an ovum or egg along’ if the
oviduct
or fallopian tube is given as the answer to part
ii
1 (L6)
(c)
B
1 (L6)
[7]
Patrick Brannac
www.SmashingScience.org
Page 8 of 8