revision questions

some things to help you revise

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  • Created on: 10-01-10 15:07
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SUMMARY QUESTIONS
a) How so plant cells differ from animal cells?
b) Root cells in a plant do not have chloroplasts'. Why?
c) A nucleus and mitochondria are important structures in
almost all cells. Why are they important?
d) What are enzymes made of?
e) Fill in the empty columns by putting a tick
STRUCTURE ANIMAL CELL PLANT CELL
nucleus
cytoplasm
cell wall
cell membrane
chloroplast
vacuole
a) Complete using words below:
DIFFUSION GAS HIGH LOW RANDOM SOLUTE
................. is net movement of particles of a ............. or a
........... from an area of ................ Concentration to an area of
................ concentration of the particles.
a) What is meant by the net movement of
particles?
b) Explain why diffusion takes place faster as the
temperature increases.
c) Explain in terms of diffusion why so many cells
have folded membranes along at least one
surface.

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Page 2

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What is the difference between diffusion and
osmosis?
b) How does osmosis help maintain the body cells
at the same concentration?
c) Define the word partially permeable.
a) What is the word equation for photosynthesis?
b) What is the word equation for photosynthesis?
c) What is chlorophyll?
d) Why are the broad shapes of leaves help photosynthesis to
take place?
e) Complete using words below:
CARBON DIOXIDE CHLOROPHYLL ENERGY GAS GLUCOSE
LIGHT OXYGEN WATER
During photosynthesis ..................... energy is absorbed
by............…read more

Page 3

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What is photosynthesis?
d) What are the three main limiting factors that effect the rate
of photosynthesis in a plant?
e) Which factors do you think would be limiting photosynthesis
in the fallowing situation? In each case, explain why the rate
of photosynthesis is limited.
(i) Plants growing on woodland floor in winter
(ii) Plants growing on woodland floor in summer.
(iii) A field of barley first thing in the morning.
(iv) The same field later on that day.…read more

Page 4

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There are two transport tissues in a plant. One is
the phloem. What is the other one?
(iii) Which transport tissue carries food around the
plant?
(iv) Which transport tissue carries water around the
plant?
a) What are the products of photosynthesis?
b) Why do plants need nitrates?
c) Why do plants need magnesium ions?
d) Where do plants get mineral ions from?
e) Which mineral ion is needed by plants to form protein?
f) Plants need to obtain mineral salts in order to survive.…read more

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Draw the pyramids of numbers and the pyramids of biomass
you would expect from the fallowing two food chains:
(i) Stinging nettles caterpillars
robin
(ii) Marine plants small fish large fish
seals polar bear
a) Why are biomasses lost in faeces?
b) Why do animals that move around a lot use up more
of the biomass they eat than animals which don't
move much?
c) Copy and complete using the words below:
BIOMASS BODY TEMPERATURE ENERGY FOOD CHAIN
GROWTH MOVEMENT PRODUCERS RESPIRATION WASTE
The amounts…read more

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What are the costs for a farmer of rearing animals
intensively?
e) What are the advantages of intensive rearing for a
farmer?
f) What are the advantages of less intensive rearing
methods?
g) What are the disadvantages of these more natural
methods?
a) Which group of organisms take materials out
of the soil?
b) Which type of organisms are the
decomposers?
Copy and complete using the words below:
BACTERIA CARBON DIOXIDE DEAD DECOMPOSERS
DIGEST FUNGI MICROORGANISM MINERALS NUTRIENTS
WASTE DROPPINGS WATER
The ..............…read more

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Food may be stored in a vacuum pack ­ with all
the air sucked out.
d) Food may be tinned ­ it is heated and sealed in
an airtight container.…read more

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Why are enzymes so important in your
body?
1) Copy and complete using the words below:
ACTIVE SITE CELLS DENATURED ENZYME INCREASES
PROTEIN REACTIONS SHAPE TEMPERATURE 40°C
The chemical ...........which takes place in living ......... happen at
relatively low............. . The rate of these .................. controlled
reactions .......... with an increase in temperature. However this is
only true up to temperatures of about ............. .
After this the ..................... structure of the enzyme is affected
and the .............. of the ..................... ................ is changed.…read more

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Bile is an .............. liquid produced by your .............. . It is stored in
the ............... ................. and released onto food as it comes
into the ................ ................. . It .................. the acid food
from the stomach and makes it alkaline. It also ............. fats.…read more

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