Obami | Digital Stakeholder Experiences

SECTION A

QUESTION 1

1.1 - Various options are provided as possible answers to the following questions. Choose the correct answer and write only the letter (A to D) as your answer.

Marks: 20

Question 1:

Insects are attracted to a flower by its …

Your Answer:

sepals

petals

anthers

carpels

Question 2:

Which ONE of the following statements about sexual reproduction is CORRECT?

Your Answer:

Spores are produced by the fusion of two haploid gametes.

Offspring are genetically identical to their parents.

Diploid gametes are produced by mitosis.

Fertilisation results in the formation of a diploid zygote.

Question 3:

The net change in a population could be determined by …

Your Answer:

adding births and deaths and subtracting emigration and immigration.

adding births and immigration and subtracting deaths and emigration.

adding births and emigration and subtracting deaths and immigration.

adding deaths and immigration and subtracting births and emigration.

Question 4:

Drinking a large volume of water will lead to ...

Your Answer:

increased production of ADH and kidney tubules becoming more permeable to water.

decreased production of ADH and kidney tubules becoming less permeable to water.

increased production of ADH and kidney tubules becoming less permeable to water.

decreased production of ADH and kidney tubules becoming more permeable to water.

Question 5:

Sensory data supplied to the cerebellum is used to …

Your Answer:

initiate voluntary movement.

coordinate motor movement.

provide conscious information on muscular movement.

control reflexes of the gut and blood system.

Question 6:

Which growth hormone is most abundant in the tips of these coleoptiles/shoots?

Attached Resource:

b8c9a266-034f-424d-9fcc-691f4a0bcb94.png

Your Answer:

Gibberellin

Abscisic acid

Auxin

Cytokinin

Question 7:

After light exposure from one side for several hours, where will the highest percentage of growth hormone referred to in the question above most likely occur?

Attached Resource:

56194c01-6bfc-4ac8-b798-dc2a0d790055.png

Your Answer:

1

2

3

4

Question 8:

The following events occur during a reflex action:

1. The effector produces a response.
2. A sensory organ is stimulated.
3. An impulse passes along a sensory neuron.
4. An impulse passes along a motor neuron.

Which of the following represent these events in the CORRECT sequence?

Your Answer:

2, 3, 4, 1

2, 1, 4, 3

1, 2, 3, 4

3, 4, 1, 2

Question 9:

Four species of kangaroo were studied in their natural environment and were found to have the following food preferences (see attached resource)

Competition is likely to be the greatest between species ...

Attached Resource:

b50cca4f-f826-446c-8c1c-140adfeb11d5.png

Your Answer:

I and II

I and III

II and IV

III and IV

Question 10:

When there is a decrease in human body temperature, which ONE of the following pathways shows the CORRECT response by blood vessels in the skin?

Attached Resource:

1123e10d-e9ff-463d-95d6-4a7fcc4351c2.png

Your Answer:

I

II

III

IV

1.2 - Give the correct biological term for each of the following descriptions. Write only the term as your answer.

Marks: 8

Question 1:

A group of plants that colonise land that has never been occupied before

Your Answer:

Question 2:

The type of development in birds where the young are incapable of moving around soon after hatching

Your Answer:

Question 3:

The changes that occur in the life cycle of an insect

Your Answer:

Question 4:

A habitat where all the living organisms and abiotic factors interact with each other

Your Answer:

Question 5:

A community interaction where the competing species coexist in the same habitat since they use the resources in slightly different ways

Your Answer:

Question 6:

A symbiotic relationship in which both species benefit from the association

Your Answer:

Question 7:

The maximum number of individuals that can be supported by an environment under prevailing conditions

Your Answer:

Question 8:

The movement of a part of a plant in response to gravity

Your Answer:

1.3 - Indicate whether each of the statements in COLUMN I applies to A ONLY, B ONLY, BOTH A AND B or NONE of the items in COLUMN II. Write A only, B only, both A and B or none as your answer.

Marks: 14

Question 1:

Match the following.

Attached Resource:

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Your Answer:

Question 2:

Match the following.

Attached Resource:

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Your Answer:

Question 3:

Match the following.

Attached Resource:

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Your Answer:

Question 4:

Match the following.

Attached Resource:

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Your Answer:

Question 5:

Match the following.

Attached Resource:

39d19ca2-3533-4d24-beec-e0591d080dd5.png

Your Answer:

Question 6:

Match the following.

Attached Resource:

22623423-522b-4d07-9dfd-eb5ed2920904.png

Your Answer:

Question 7:

Match the following.

Your Answer:

1.4 - The diagram below shows the structure of the female reproductive system. Give the LETTER and NAME of the following:

Marks: 8

Attached Section Resource:

37bae6c7-f3bb-49a0-8011-b3a9506fc92c.png

Question 1:

The part that breaks down when the levels of progesterone and oestrogen drop

Your Answer:

Question 2:

The part that plays a role during copulation

Your Answer:

Question 3:

The part where the zygote will be formed

Your Answer:

Question 4:

The part where the Graafian follicles develop

Your Answer:

SECTION B

QUESTION 2

2.1 - Study the information in the table below showing the growth of a foetus in the uterus of a woman.

Marks: 16

Attached Section Resource:

b0f69819-01b8-4f1d-a760-2f1d67645109.png

Question 1:

Between which TWO months did the foetus grow the most?

Your Answer:

Question 2:

Draw a line graph to represent the data from the table above.

Your answer: Resource(s)

Question 3:

State ONE general conclusion that can be drawn from the data about the growth of the foetus in the uterus.

Your Answer:

Question 4:

State TWO functions of the amniotic fluid that surrounds the foetus during its development.

Your Answer:

Question 5:

Name and describe the stage that signals the start of the natural birth process once the foetus is fully developed.

Your Answer:

2.2 - A young couple, who already have three children, are planning to use contraceptives. They do not know which options for contraception are available.

Marks: 3

Question 1:

Give ONE reason why this couple may not want to have any more children.

Your Answer:

Question 2:

Name any TWO barrier methods they can use for contraception.

Your Answer:

2.3 - The blood glucose level is regulated by hormones. The human body attempts to maintain a glucose concentration of approximately 1 mg per mℓ of blood. The graph below shows the fluctuations in an individual's blood glucose level over a five-hour period.

Marks: 6

Attached Section Resource:

dafecbf7-6e5b-4d8d-9859-5713ec062cc7.png

Question 1:

From the information above and your knowledge of hormones, name the hormone released at:
(a) B
(b) D

Your Answer:

Question 2:

The individual ate a meal at point D. Explain the pattern of the graph for the next two hours.

Your Answer:

2.4 - The diagram below shows a cross section through the human ear.

Marks: 5

Attached Section Resource:

d279b6da-b281-4e40-965c-35398b0b2653.png

Question 1:

Identify part:
(a) B
(b) C

Your Answer:

Question 2:

What does structure A consist of?

Your Answer:

Question 3:

Explain what would happen if structure D had a hole in it.

Your Answer:

QUESTION 3

3.1 - Read the passage below and answer the questions that follow. Explain the following:

Marks: 4

Attached Section Resource:

7b3388c7-ece7-4d1c-a636-9b423f874abb.png

Question 1:

ONE disadvantage of having only one breeding female in the colony

Your Answer:

Question 2:

ONE advantage of the different workers carrying out different functions

Your Answer:

3.2

Marks: 6

Attached Section Resource:

5b6fdd11-c300-445a-93cc-fb4e3cd2a2f7.png

Question 1:

Use the following formula to estimate the total population of mice in the field.

P = `(FxxS)/(M)`

Where:

P = The estimated number of mice in the field
F = The number of mice caught and marked in the first catch
S = The number of mice caught in the second catch
M = The number of marked mice in the second catch

Your Answer:

Question 2:

State TWO precautions that should be taken in capturing and tagging the mice to ensure validity of the procedure.

Your Answer:

Question 3:

Give TWO reasons why the estimated population may differ significantly from the actual population.

Your Answer:

3.3 - The age-gender pyramids below represent the population distribution of two different countries, A and B.

Marks: 5

Attached Section Resource:

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Question 1:

In age-gender pyramid A, which gender has the higher proportion reaching old age (65+)?

Your Answer:

Question 2:

In age-gender pyramid B, which age group makes up exactly 4% of the male population?

Your Answer:

Question 3:

Which age-gender pyramid represents the population of a developing country?

Your Answer:

Question 4:

Give TWO reasons for your answer to the question above.

Your Answer:

3.4 - Study the graph below which shows the changes in two age groups in Norway, from 1860 to 2010, as a percentage of the total population and an estimation for 2060.

Marks: 7

Attached Section Resource:

cbcca02d-2d29-4dbb-ad00-cd0be5fc366f.PNG

Question 1:

From 1860 to 2060, what trend can be observed about the proportion of people:
(a) Older than 65 years
(b) Younger than 15 years

Your Answer:

Question 2:

Give THREE reasons for the changes referred to in the question above.

Your Answer:

Question 3:

State TWO problems which these changes in age structure might cause in future.

Your Answer:

3.5 - Study the graph below and answer the questions that follow.

Marks: 7

Attached Section Resource:

c49a2185-050d-4c22-89f6-688df933ab8f.png

Question 1:

Which part of the curve (A, B, C or D) shows the following the best:

(a) The years in which the death rate was equal to the birth rate
(b) The years in which the birth rate was slightly higher than the death rate
(c) The years in which the birth rate was much higher than the death rate

Your Answer:

Question 2:

Explain how the trend in the graph above could change if a population of sheep was introduced in the area in the 10th year.

Your Answer:

SECTION C

QUESTION 4

4.1

Attached Section Resource:

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4.2 - A farmer did an investigation to determine the changes in the population size of two types of insects (A and B) on her farm, from March to October. One insect is a type of green blowfly, and the other is a beetle which feeds on green blowflies. The farmer also discovered that the green blowflies are pests and carry diseases that affect her cattle.

Marks: 9

Attached Section Resource:

91929d3f-b66e-4113-aa08-12d8e307d43e.png

Question 1:

Which curve (A or B) represents the population size of the green blowflies?

Your Answer:

Question 2:

Give a reason for your answer to the question above.

Your Answer:

Question 3:

Explain why the two curves are similar in shape.

Your Answer:

Question 4:

Explain how the farmer can use her knowledge about the relationship between A and B in the graph above to prevent diseases in her cattle.

Your Answer:

4.4

Marks: 20

Question 1:

Describe the negative feedback mechanism involving TSH and thyroxin and describe the consequences if this mechanism does NOT function well.

Content: (17)
Synthesis: (3)

Your Answer: