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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…

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a) 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…

Page 3

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c) 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…

Page 4

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(ii) 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)…

Page 5

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e) 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…

Page 6

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d) 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…

Page 7

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c) 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.




a) What are the main sources of carbon on
Earth?
b) What effect does photosynthesis have on the
distribution…

Page 8

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g) 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…

Page 9

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they and how does this explain the symptoms of starvation
described above?













1) Copy and complete these sentences, matching the pairs.

ABOSORBED BROKEN DOWN CELLS DIGESTIVE ENZYMES
FOOD INSOLUBLE SOLUBLE

The .......... you eat is made up if large .............. molecules which
need to be ................. ................. to form smaller,…

Page 10

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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.


2) At what pH does…

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