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B2 5.1c – Student worksheet
Questions of respiration
1
a
Copy and complete the word equation for respiration:
glucose + _______  ________ + __________ + energy (3 marks)
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4
b
Where does the glucose come from? (1 mark)
c
Where does the O2 come from? (1 mark)
d
Describe how CO2 gets from a cell where it is made into the air. (2 marks)
The reactions of respiration mostly take place in small structures in each cell.
a
What are these structures called? (1 mark)
b
Why are these structures found in every cell? (1 mark)
c
In which type of cell would you expect to find more of these structures – a heart muscle cell
or a bone cell? Explain your answer. (2 marks)
Respiration releases energy.
a
Write down three things that your body uses this energy for. (3 marks)
b
Write down one thing that a plant uses energy for that is the same in an animal. Explain
why this is the same in plants and animals. (1 mark)
c
Write down one thing a plant uses energy for that an animal doesn’t. Explain why this is
different in plants and animals. (2 marks)
d
Write down one thing that mammals and birds use energy for that other animals, such as
reptiles, don’t. (1 mark)
Some students used the apparatus opposite to test whether
woodlice produce carbon dioxide during respiration. They knew
that when carbon dioxide dissolves in water it makes an acid, so
they used Universal Indicator to test for it.
a
The indicator showed that the pH was neutral at the start. What
colour was it? (1 mark)
b
Suggest how the colour changed when the experiment was
running. (1 mark)
c
By the end of the experiment, the indicator showed the water
had become more acidic. The students concluded that this
proved that carbon dioxide had been released by the woodlice.
Do you agree with their conclusion? Give a reason for your
answer. (2 marks)
d
How could the students improve their experiment so that they
could get a more reliable result? (1 mark)
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