S2 B
KBTC International School
Examination and Evaluation Board
NAME
ROLL NUMBER
LEVEL
Secondary - 2
BATCH NUMBER
Batch 1 (
EXAM
Year-End
)
BIOLOGY
APRIL 2024
50 Marks
1 hr 30 mins
READ THESE INSTRUCTIONS FIRST.
Write your answers in the space provided.
Write in dark blue and black pen.
You may use an HB pencil for any lines, diagrams
or graphs.
Do not use correction fluid.
ANSWER ALL QUESTIONS.
100
Score
This document consists of (10) pages.
[1]
SECTION A
Questions 1 to 15 carry 1 mark each. For each question, the options are given. Choose the one that you
consider correct and write its letter in the space provided.
(15×1 = 15 marks)
1. Which of the following prevents the collapse of trachea?
A. Jugular foramen
B. Cartilage
C. Diaphragm
D. None of the above
1._____________
2. Which of the following is the correct equation for aerobic cellular respiration?
A. Glucose + Oxygen --> Lactic acid + Carbon dioxide
B. Glucose + Oxygen --> Carbon dioxide + Water
C. Carbon dioxide + Water --> Glucose + Oxygen
D. Carbon dioxide + Water --> Glucose + Water
2._____________
3. The diagram shows blood as seen under a microscope.
Which identifies parts P, Q, R and S of the blood?
A.
B.
C.
D.
Plasma
P
Q
R
S
Platelet
Q
P
S
R
White blood cell
R
S
Q
P
Red blood cell
S
R
P
Q
3._____________
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KBTC International School
[2]
4. Study the information about plant X below.
Which of the following is the most likely purpose of the adaptations of plant X shown below?
A. To prevent predators from eating the leaves
B. To reduce the rate of water loss on hot days
C. To prevent herbivores from eating the leaves
D. To allow the branches to climb and reach towards sunlight
4._____________
5. Study the food web below.
If the whole population of J is killed by a disease, which of the following populations will be most
affected?
A. F
B. G
C. K
D. L
5._____________
6. The place where an organism lives, which provides it with shelter, food and water.
A. Ecosystem
B. Population
C. Community
D. Habitat
6._____________
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KBTC International School
[3]
7. Some insecticides are _________. This means that they can be broken down by microorganisms in the
environment, or inside an animal’s body.
A. Non-biodegradable
B. Biodegradable
C. Persistent
D. Imperishable
7._____________
8. Which trophic level is usually most affected by biomagnification?
A. Producers
B. Primary consumers
C. Secondary consumers
D. Top predators
8._____________
9. Arun added few drops of iodine solution to three test tubes A, B and C containing food samples. A
blue-black colour appeared on the test tube A and C.
What was the correct order of the food samples in the test tubes?
A. Rice, peas, potatoes
B. Rice, potatoes, peas
C. Peas, rice, potatoes
D. Peas, potatoes, peas
9._____________
10. A person with deficiency of X may get an illness called scurvy. What does X represent?
A. Vitamin D
B. Vitamin A
C. Vitamin C
D. Iron
10.____________
11. The table shows the nutrients in different parts of a meal. Which food would be most useful in
preventing constipation.
11.____________
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KBTC International School
[4]
12. The table describes some characteristics of four people. Which person requires the highest energy
intake in their diet?
A.
B.
C.
D.
Age
5
20
40
65
Sex
Male
Male
Female
Female
Level of activity
High
High
Low
Low
Body weight/kg
18
85
82
75
12.____________
13. Which substance in cigarettes can increase the chance of bearing underweight babies?
A. Nicotine
B. Carbon monoxide
C. Tar
D. Particulates
13.____________
14. The diagram shows an X ray of the lower leg. Which bone is broken in the diagram?
A. Tibia
B. Fibula
C. Radius
D. Ulna
14.____________
15. The diagram shows the bones of the forelimb.
Which labels show where the muscle that straightens the hinge joint is attached?
A. 1 and 2
B. 3 and 4
C. 4 and 5
D. 4 and 6
Secondary 2
15.____________
KBTC International School
[5]
SECTION B
Questions 16 to 20 carry 3 marks each.
(5×3 = 15 marks)
16. Pierre says,
‘I predict that animals with a larger mass will have red blood cells with a larger diameter.’
He decides to look for secondary information from the internet.
Here is the information that Pierre finds.
(a) Use the information from the table. Does this information support Pierre’s prediction? Explain
your answer.
________________________________________________________________________________
______________________________________________________________________________[2]
(b) Complete the sentence.
Gases move between blood and air in the lungs by ________________.
[1]
17. The diagram shows the concentration of DDT in each trophic level. DDT is persistent chemical and
cause biomagnification.
(a) What is meant by the term persistent?
______________________________________________________________________________[1]
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KBTC International School
[6]
(b) Describe two possible ways in which DDT gets to the water.
________________________________________________________________________________
______________________________________________________________________________[1]
(c) How many times greater is the concentration of DDT in a fish-eating bird’s body than in water?
______________________________________________________________________________[1]
18. We need a varied diet. The diagram shows a food pyramid, indicating how much we need to eat of
each food type.
(a) Which food type is in part A on the pyramid?
______________________________________________________________________________[1]
(b) Name the nutrients provided by food group A.
______________________________________________________________________________[1]
(c) According to the pyramid, which food type should we eat the least to stay healthy? Explain your
answer.
________________________________________________________________________________
______________________________________________________________________________[1]
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KBTC International School
[7]
19. The table shows the recommended daily amount of calcium for a person in four stages of the human
life cycle.
(a) Use information in the table to estimate how much calcium a breast-feeding woman should have
each day.
______________________________________________________________________________[1]
(b) Explain why she should need this amount of calcium.
______________________________________________________________________________[1]
(c) Name the essential vitamin which is needed to absorb calcium.
______________________________________________________________________________[1]
20. The diagram shows the relationship between the number of cigarettes and baby birthweight.
(a) What is the weight of the babies born by non-smoking mothers?
______________________________________________________________________________[1]
(b) Why do smokers tend to have babies with lower birthweight?
______________________________________________________________________________[1]
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KBTC International School
[8]
(c) Why is it difficult to give up smoking, once you have started?
______________________________________________________________________________[1]
SECTION C
Questions 21 to 24 carry 5 marks each.
(4×5 = 20 marks)
21. The diagram shows two red blood cells.
(a) Copy the white blood cell and label the cell membrane and cytoplasm.
_____________________________________________________________________________[1]
(b) Name two structures that most cells have, but that red blood cells do not have.
______________________________________________________________________________[2]
(c) The white blood cells kill pathogens by phagocytosis. Describe how it does this.
________________________________________________________________________________
______________________________________________________________________________[2]
22. The following shows the food chains in the Arctic ecosystem.
•
•
Fish --> Seal --> Polar bear
Algae --> Shrimp-like organism --> Fish
•
Fish --> Sea bird --> Arctic fox
(a) Construct the food web based on the given food chains.
[3]
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KBTC International School
[9]
(b) Humans introduced red king crabs to new areas within the Arctic to expand commercial fisheries.
Red king crabs are an invasive species. What is meant by the term “invasive species”?
______________________________________________________________________________[1]
(c) Here is a picture of red king crab.
What type of skeleton do the red king crabs have?
______________________________________________________________________________[1]
23. The table shows the daily nutrient needs of children of different ages.
(a) A 9-year-old-boy needs 10 mg of iron per day. Calculate the percentage change in daily mass of
iron needed when the same boy is 14 years old.
______________________________________________________________________________[1]
(b) The daily mass of iron needed by boys changes as they get older, but the mass of iron needed by
girls does not change. Suggest and explain one reason why.
______________________________________________________________________________[1]
(c) Explain why boys and girls aged 12 - 16 need more protein than boys and girls aged 5 - 11.
______________________________________________________________________________[1]
(d) Describe the pattern shown in the need for calcium of children of different ages.
______________________________________________________________________________[1]
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KBTC International School
[10]
(e) Why does a child need fats and oils?
______________________________________________________________________________[1]
24. Look at the diagram. It shows muscles and bones in the human arm.
Muscle 1
Joint 1
Joint 2
Muscle 2
(a) Label Muscles 1 and 2.
Muscle 1 __________________
Muscle 2 __________________
(b) Choose the joint that allows 360 ° movement.
Joint A
[1]
Joint B
[1]
(c) Name the joint 2. How many directions does joint 2 allow movement?
______________________________________________________________________________[1]
(d) To make the arm move the biceps and triceps either relax or contract. Write contract or relax after
biceps and triceps to say what is happening in each diagram.
_________________________________________________________________________________
______________________________________________________________________________[1]
Secondary 2
KBTC International School