Kampus Teras Murni
First Term Examinations
CANDIDATE
NAME
YEAR 8
BIOLOGY PAPER 2
Candidates to answer on the space
provided
Additional Materials: None
READ THESE INSTRUCTIONS FIRST
Write your name in the space provided.
Write in black ink ball point pen.
Write your answer to each question in space provided.
Answer all questions.
The total mark for this paper is 60
MARCH 2022
1 hour 30 minutes
1) Table 1.1 shows diagrams of some blood cells. Complete the table.
(ii) Describe the function of structure X in the cell shown in Table 1.1.
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...................................................................................................................................... [1]
2) Fig. 7.1 shows a diagram of an enzyme molecule and some other smaller molecules.
Enzymes function as biological catalysts.
3) (a) Fig. 1.1 shows diagrams of two plant cells as seen using a light microscope.
4) (a) The pie chart in Fig. 10.1 shows the proportion of different nutrients contained in a
meal.
5) (a) Fig. 4.1 shows a drawing of a single-celled organism called Euglena as seen using a
light microscope. This organism has features of both plants and animals
6.) (a) A balanced diet for a person contains all nutrients in the correct amounts for their
needs. Iron is needed in the diet. If a person does not take in enough iron they suffer from
anaemia.
7) A student investigated the diffusion of substances through Visking tubing, an artificial
membrane which has some of the properties of cell membranes. The student made a bag of
Visking tubing as shown in Fig. 4.1.
(ii) State three factors that influence the movement of molecules through membranes.
1 .............................................................................................................................
2 .............................................................................................................................
3 ............................................................................................................................. [3]
8) Blood is distributed through the body of a mammal in blood vessels. The blood supply to
muscles changes considerably at the start and at the end of exercise. Fig. 4.1 shows a cross
section of a blood vessel as seen with an electron microscope.
(b) State three substances that move across the wall of the blood vessel at Z. [3]
1. _______________________________________________________________________
2. _______________________________________________________________________
3. _______________________________________________________________________
9) Enzymes are used in biological washing powders.
(i) Describe how the presence of these enzymes may increase the efficiency of the washing
powder in removing stains from clothes.
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_______________________________________________________________________[3]
(ii) Suggest a suitable temperature for a wash using a biological washing powder. Explain
your answer.
Suitable temperature ---------------------------------------------------------------------------------Explanation. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ [1]
(iii) Explain why the temperature of the wash needs to be carefully controlled.
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___________________________________________________________________[3]
10) Name the carbohydrate that is transported in the phloem. [1]
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