Co-ordinated Sciences - Biology
March, 2019
Additional Materials:
None
READ THESE INSTRUCTIONS FIRST
Write in dark blue or black pen.
You may use an HB pencil for any diagrams or graphs.
Do not use staples, paper clips, glue or correction fluid.
Answer all questions.
You may lose marks if you do not show your working or if you do not use appropriate units.
The number of marks is given in brackets [ ] at the end of each question or part question.
The test consists of 10 multiple choice questions worth [1] mark each and a selection of
longer problems with a mark value under each question.
The total amount of marks in this examination is 42.
1
1. Which rows correctly match characteristics of living things with their descriptions?
Characteristic
description
1 excretion
removing the waste products of metabolism
2 growth
making more living things of the same type
3 nutrition
taking in or producing food
4 respiration
obtaining energy from food
A. 1, 2 and 4
B. 1, 3 and 4
C. 1 and 3 only
D. 2 and 4 only
[1]
2. Which chemical element is found in proteins, but not in carbohydrates or fats?
A. Carbon.
B. Hydrogen.
C. Oxygen.
D. Nitrogen.
[1]
3. During photosynthesis, where does most of the carbon dioxide and water enter a leaf?
carbon dioxide
Water
through cuticle
in phloem
A.
through cuticle
in xylem
B.
through stomata
in phloem
C.
through stomata
in xylem
D.
[1]
4. The diagram shows part of a plant root in the soil. The root is absorbing water.
At which labelled point is the water potential highest?
[1]
2
5. Which statements about enzymes are correct?
1.
2.
3.
4.
Their activity is always increased at a higher temperature.
Their activity is affected by the pH of the solution they are in.
They are carbohydrates.
They function as biological catalysts.
A. 1, 2 and 3
B. 1, 3 and 4
C. 2 and 3
D. 2 and 4
[1]
6. Which row states the basic units from which the large molecules are made?
[1]
7. The width of the plant cell in the diagram is 30 mm when it is magnified by a
microscope (magnification shown in brackets).
What is the actual width of the cell?
A. 0.003 mm
B. 0.03 mm
C. 0.3 mm
D. 30 mm
[1]
8. The diagram shows two different cells. Which feature do they both have?
A. cell membrane
B. cell wall
C. central vacuole
D. chloroplasts
[1]
3
9. The graph shows the effect of pH on a particular enzyme-controlled reaction.
When is the enzyme not active?
A. at pH 1 and pH 13
B. at pH 3 and pH 11
C. at pH 5 and pH 9
D. at pH 7
[1]
10. Which nutrient produces a purple colour when mixed with biuret solution?
A. fat
B. protein
C. reducing sugar
D. starch
[1]
11.Figure shows some of the regions of the alimentary canal in a human.
(a) Name the structures labeled A, B and C.
A ………………………………..
B ………………………………...
C ………………………………..
[3]
(b) State one function of the pancreas.
…………………………...........................................
[1]
4
(c) (i) With reference to the alimentary canal, define the term absorption.
……………………………………………………………………………………………
……………………………………………………………………………………….
………………………………………………………………………………………. [2]
(ii) Name the parts of the alimentary canal in which there is the most absorption of:
sugars ………………………………………….
water ……………………………………………
[2]
(iii) Explain how assimilation differs from absorption.
……………………………………………………………………………………….
……………………………………………………………………………………….
[2]
12. In the seventeenth century, it was believed that plants obtained all their food from the
soil. A scientist called Jan van Helmont did an experiment to investigate this. He weighed a
young willow tree, and then planted it in a large tub containing a weighed amount of dry soil.
He added water to the soil, and kept the tree for five years, watering it regularly. After five
years, the tree had grown.
After the five years, he weighed the tree again, and he also dried and reweighed the soil in the
tub. Table shows his results.
(a) (i) Name the process by which plants manufacture carbohydrates from raw materials.
…………………………………………………………………..
[1]
(ii) Write the word equation for this process.
…………………………………………………………………………………………..
[2]
5
(b) (i) Describe how the mass of the soil changed over the five years of the experiment.
……………………………………………………………………………………………
[1]
(ii) Suggest an explanation for this result.
…………………………………………………………………………………………………
…………………………………………………………………………………………… [1]
(c) Van Helmont thought that the growth of his tree was entirely due to the water that he had
added. This conclusion was only partly correct.
(i) Explain in what way the conclusion was correct.
……………………………………………………………………………………………
[1]
(ii) State which other part of the environment contributed to the mass of the tree.
……………………………………………………………………………………………
[1]
13. Picture shows part of a transverse section of a leaf, as seen through a microscope.
In this leaf, name:
(a) a tissue where photosynthesis occurs,
...............................................................................................................
[1]
(b) two tissues specialised for transport,
1 .................................................................................
2 ..................................................................................
[2]
(c) a place where water loss occurs from the leaf.
......................................................................................
[1]
6
14. A balanced diet should contain some fat.
(a) (i) State one function of fat in the body.
…………………………………………………………………………
[1]
(ii) List the six other components of a balanced diet.
……………………………………………….
……………………………………………….
……………………………………………….
……………………………………………….
……………………………………………….
……………………………………………….
[6]
(b) Too much fat in the diet is a form of malnutrition.
Describe the harmful effects of too much fat in the diet.
…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………… [2]
c) Match each deficiency disease on the left with correct description on the right.
A. Scurvy
i. Lack in vitamin D
B. Anaemia
ii. Lack in vitamin A
C. Rickets
iii. Lack in iron
D. Night blindness
iv. Lack in vitamin C
[2]
7