Embed Size (px)
Citation preview
Paper Reference(s)
4325/03 4437/07
London Examinations IGCSE
Biology – 4325
Paper 3
Science (Double Award) – 4437
Paper 7
Foundation and Higher Tiers
Tuesday 17 November 2009 – Morning
Time: 1 hour 15 minutes
Materials required for examination Items included with question papers
Nil Nil
Instructions to Candidates
In the boxes above, write your centre number, candidate number, your surname, initial(s), the paper reference and your signature. The paper references are shown above. Write the one for which you have been entered. Check that you have the correct question paper.Answer ALL the questions. Write your answers in the spaces provided in this question paper.Do not use pencil. Use blue or black ink.Show all stages in any calculations and state the units. Calculators may be used.
Information for Candidates
The marks for individual questions and the parts of questions are shown in round brackets: e.g. (2).There are 6 questions in this question paper. The total mark for this paper is 50.There are 16 pages in this question paper. Any blank pages are indicated.
Advice to Candidates
Write your answers neatly and in good English.
Examiner’s use only
Team Leader’s use only
Question Leave Number Blank
1
2
3
4
5
6
Total
Surname Initial(s)
Signature
Centre
No.
*N34898A0116*Turn over
Candidate
No.
Paper Reference
This publication may be reproduced only in accordance with
Edexcel Limited copyright policy.
©2009 Edexcel Limited.
Printer’s Log. No.
N34898AW850/U4335/57570 6/6/7/3/
2
*N34898A0216*
BLANK PAGE
Leave
blank
3
Turn over*N34898A0316*
Answer ALL the questions. Write your answers in the spaces provided.
1. Food tests can be carried out on a sample of food to see if it contains certain substances.
(a) Use the correct words from the list to complete the table to show the solutions used,
the colour of the solutions at the start and the colour of the solutions at the end.
Benedict’s Biuret blue iodine pink black red white yellow
Substance
tested for
Solution
used
Colour of
solution at start
Colour of
solution at end
Heat
required
starch no
glucose yes
(3)
(b) In the test for glucose the solution needs to be heated.
Give two precautions you would use to heat the solution safely.
1 ....................................................................................................................................
.......................................................................................................................................
2 ....................................................................................................................................
.......................................................................................................................................
(2) Q1
(Total 5 marks)
Leave
blank
4
*N34898A0416*
2. Plants absorb gas through their leaf surfaces.
The photographs show the lower surfaces of the leaves of two plant species.
The images are of the same high magnification.
Leaf A Leaf B
(a) (i) Name the pores labelled on the photographs.
................................................................................................................................
(1)
(ii) Describe how these pores change when the plant leaf is exposed to bright light in
the morning.
Explain how this change benefits the plant.
................................................................................................................................
................................................................................................................................
................................................................................................................................
................................................................................................................................
................................................................................................................................
................................................................................................................................
(3)
pores
epidermis cells
Leave
blank
5
Turn over*N34898A0516*
(b) Look at the photographs and complete the table.
Feature Leaf A Leaf B
number of pores
shape of epidermis cells
(3)
(c) The diagram shows apparatus that can be used to measure water loss from a leafy
shoot.
leafy shoot
water
capillary
tube
air bubble
Leave
blank
6
*N34898A0616*
(i) Describe how the apparatus is used to measure the rate of water loss.
................................................................................................................................
................................................................................................................................
................................................................................................................................
................................................................................................................................
................................................................................................................................
................................................................................................................................
(3)
(ii) State one precaution you should take to make sure that the apparatus works
correctly.
................................................................................................................................
................................................................................................................................
(1)
(iii) The rate of water loss from a leafy shoot changes with a higher wind speed.
Describe how you could show this using this apparatus.
................................................................................................................................
................................................................................................................................
................................................................................................................................
................................................................................................................................
(2) Q2
(Total 13 marks)
Leave
blank
7
Turn over*N34898A0716*
3. Ian set up an experiment to measure the carbon dioxide gas released when bean seeds start
to germinate.
He wanted to compare the rate of gas production at two different temperatures, 10 °C and
20 °C.
(a) To make sure that the gas released is carbon dioxide, Ian uses an indicator.
What indicator should Ian use, and what changes would he see, as the gas is
released?
.......................................................................................................................................
.......................................................................................................................................
.......................................................................................................................................
.......................................................................................................................................
(2)
(b) Name two variables that need to be kept constant at each temperature.
1 ....................................................................................................................................
2 ....................................................................................................................................
(2)
thermometer
bean seeds
indicator
boiling tube
test tube
cotton wool
Leave
blank
8
*N34898A0816*
(c) Ian counted the number of bubbles of gas released in a minute at 10 °C and at 20 °C.
He wrote his results as follows.
In the space below draw a suitable table and use it to show Ian’s results.
(3)
10°C
1st minute 11 bubbles2nd minute 9 bubbles3rd minute 7 bubbles4th minute 8 bubbles
20°C
1st minute 16 bubbles2nd minute 15 bubbles3rd minute 13 bubbles4th minute 11 bubbles
Leave
blank
9
Turn over*N34898A0916*
(d) Describe and explain Ian’s results.
.......................................................................................................................................
.......................................................................................................................................
.......................................................................................................................................
.......................................................................................................................................
(2)
(e) Ian measured the rate of gas production by counting the bubbles released in a minute.
Suggest a more accurate way of measuring the rate of gas production.
.......................................................................................................................................
.......................................................................................................................................
.......................................................................................................................................
.......................................................................................................................................
(2)
(f) (i) Ian’s teacher explained that the gas in the boiling tube expands as the temperature
increases. Explain how this could have affected Ian’s results.
................................................................................................................................
................................................................................................................................
................................................................................................................................
................................................................................................................................
(2)
(ii) Suggest how Ian could modify his experiment to take account of this effect.
................................................................................................................................
................................................................................................................................
(1) Q3
(Total 14 marks)
Leave
blank
10
*N34898A01016*
4. Describe an investigation you could do to find out the effect of carbon dioxide concentration
on the movement of insect larvae.
..............................................................................................................................................
..............................................................................................................................................
..............................................................................................................................................
..............................................................................................................................................
..............................................................................................................................................
..............................................................................................................................................
..............................................................................................................................................
..............................................................................................................................................
..............................................................................................................................................
..............................................................................................................................................
..............................................................................................................................................
..............................................................................................................................................
..............................................................................................................................................
..............................................................................................................................................
..............................................................................................................................................
.............................................................................................................................................. Q4
(Total 6 marks)
Leave
blank
11
Turn over*N34898A01116*
5. The graph shows how the concentration of starch changes as it is digested by an
enzyme.
(a) Describe how the concentration of starch changes with time.
.......................................................................................................................................
.......................................................................................................................................
.......................................................................................................................................
(2)
(b) Starch is being digested less quickly at ten minutes than at two minutes.
Suggest an explanation for this.
.......................................................................................................................................
.......................................................................................................................................
.......................................................................................................................................
(1)
(c) State one variable that should have been kept constant during this experiment.
For this variable describe how you could keep it constant.
Variable .........................................................................................................................
.......................................................................................................................................
How variable kept constant ..........................................................................................
.......................................................................................................................................
(2) Q5
(Total 5 marks)
starch
concentration
time in minutes
0 105
Leave
blank
12
*N34898A01216*
6. Bethany wanted to investigate where plants of two different species tend to grow.
She wanted to see if plant species A and plant species B grew equally on the slope of a hill
and on level ground in the same field.
She used a 0.5 m 0.5 m quadrat to sample the number of the two different plant species
found on the slope of a hill and on level ground.
She sampled each area three times and recorded her results in the following tables.
Slope of hill
QuadratTally of
plant A
Number of
plant A
Tally of
plant B
Number of
plant B
1 1111 4 1111 111 8
2 11 2 1111 1111 11 12
3 1111 4 1111 11
Level ground
QuadratTally of
plant A
Number of
plant A
Tally of
plant B
Number of
plant B
1 1111 1111 111 13 1111 4
21111 1111
111114 1111 5
3 1111 1111 9 1111 1 6
(a) Complete the table to show the number of plant B in quadrat 3 on the slope of the
hill.
(1)
(b) (i) Complete the table below by calculating the mean number of plant B per quadrat
growing on the slope of the hill.
Area Mean number of plant A Mean number of plant B
Slope of hill 3.33
Level ground 12.00 5.00
(1)
Leave
blank
13
*N34898A01316*
(ii) On the grid below, plot a bar chart to show the mean number of plants per quadrat
growing in each area.
(3)
(c) Describe how the distribution of plants A and B varies in each area.
.......................................................................................................................................
.......................................................................................................................................
.......................................................................................................................................
.......................................................................................................................................
(2)
TOTAL FOR PAPER: 50 MARKS
END
Q6
(Total 7 marks)
14
*N34898A01416*
BLANK PAGE
15
*N34898A01516*
BLANK PAGE
16
*N34898A01616*
BLANK PAGE
