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AGA KHAN UNIVERSITY EXAMINATION BOARD

SECONDARY SCHOOL CERTIFICATE

CLASS X EXAMINATION

MAY 2015

Biology Paper II

Time: 2 hours 25 minutes Marks: 40

INSTRUCTIONS

Please read the following instructions carefully.

1. Check your name and school information. Sign if it is accurate. 

2. RUBRIC. There are EIGHT questions. Answer ALL questions. Questions 7 and 8 each offer

TWO choices. Attempt any ONE choice from each.

3. When answering the questions:

Read each question carefully.

Use a black pencil for diagrams. DO NOT use coloured pencils.

DO NOT use staples, paper clips, glue, correcting fluid or ink erasers.

Complete your answer in the allocated space only. DO NOT write outside the answer box.

4. The marks for the questions are shown in brackets ( ).

I agree that this is my name and school.

Candidate's signature

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 blood in

 blood out

air in and out

Q.1. (Total 4 Marks)

a. The diagram below shows some characteristics of alveoli.

Which TWO characteristics, visible in the diagram, enable alveoli to perform their function

efficiently? (2 Marks)

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 b. How do kidneys keep the composition of blood constant? (2 Marks)

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receptor

sensory neurone

motor neurone

effector

spinal cord

Q.2. (Total 4 Marks)

The diagram shows the path of a nervous impulse in case of a reflex action.

There are TWO errors (mistakes) in the diagram. Highlight these errors (mistakes) in the diagram

using circles and redraw the correct diagram.

Space for drawing

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Q.3. (Total 4 Marks)

a. Categorize the following parts of the human skeleton as axial or appendicular. (2 Marks)

Axial Skeleton Appendicular Skeleton

 b. How do hinge joints work? Give an example of a hinge joint present in the human body.

(2 Marks)

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Q.4. (Total 4 Marks)

a. Why is parthenogenesis considered a type of asexual reproduction? (2 Marks)

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rib cage skull pectoral girdle vertebral column

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 b. The given diagram shows a part of a flower labelled M. What role does it play in the formation

of a fruit? (2 Marks)

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Q.5. (Total 4 Marks)

A male black-haired cat is crossed with a female white-haired cat. Determine the expected genotypes

of the offspring.

(Your answer should include working of both the possible crosses.)

Cross 1 Cross 2

Expected Genotype: Expected Genotype:

M

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Q.6. (Total 5 Marks)

a. In what ways genetic engineering has benefited agriculture? (2 Marks)

i. _____________________________________________________________________________

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ii. ____________________________________________________________________________

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 b. Three persons Mr X, Y and Z are addicted to sedatives, narcotics and hallucinogens respectively.

Write any TWO effects that can be observed on the metabolism of each individual.

(3 Marks)

Person Addicted to Effect on Metabolism

Mr X Sedatives

Mr Y Narcotics

Mr Z Hallucinogens

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Q.7. (Total 7 Marks)

EITHER

a. What is the significance of structural adaptation to function? Describe how the structure of eachlabelled part of the nephron is related to its respective function.

OR

 b. Define the term hormone. Describe the effects of vasopressin, calcitonin and thyroxin on the

 body metabolism when released in excess and in less than required amount.

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I

 III

II

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Q.8. (Total 8 Marks)

EITHER

a. Why is sun considered to be the principle source of energy for all forms of life? Describe theways in which the flow of material and the flow of energy in an ecosystem are similar and

different.

OR

 b. Describe any TWO harmful effects of each, deforestation and acid rain, on plant and animal life.

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