ZIMSEC O-Level Biology Paper 1 June 2019 Question Paper

ZIMBABWE SCHOOL EXAMINATIONS COUNCIL <br> General Certificate of Education Ordinary Level

**BIOLOGY** **PAPER 1 Multiple Choice**

**JUNE 2019 SESSION**

Additional materials: Multiple Choice answer sheet Soft clean eraser Soft pencil (type B or HB is recommended) Mathematical tables/Electronic calculator (optional)

1 hour

**TIME 1 hour**

INSTRUCTIONS TO CANDIDATES

Do not open this booklet until you are told to do so. Write your name, Centre number and candidate number on the answer sheet in the spaces provided unless this has already been done for you.

There are forty questions in this paper. Answer all questions. For each question, there are four possible answers, A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the separate answer sheet.

Read very carefully the instructions on the answer sheet.

INFORMATION FOR CANDIDATES

Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet.

Question 1

The diagram shows a safety symbol used in a science laboratory.

The symbol is a warning against

A fires.

B smoke.

C radiation.

D fans.

Question 2

Which branch of Biology involves the study of cells?

A botany

B anatomy

C ecology

D cytology

Question 3

Which carbohydrate is a polysaccharide?

A glucose

B maltose

C starch

D sucrose

A coolant.

B catalyst.

C solvent.

D reagent.

Question 5

The organelle that contributes to the osmotic properties of a plant cell is the

A cell wall.

B chloroplast.

C cytoplasm.

D vacuole.

Question 6

Which feature of a red blood cell increases its surface area?

A presence of haemoglobin

B absence of a nucleus

C thin membrane

D thin cross section

Question 7

The diagram shows an animal cell. In which part, A, B, C or D, does aerobic respiration take place?

Question 8

Which statement about enzymes is not true?

A they are biological catalysts

B they are used up during catalysis

C they are substrate specific

D they are protein in nature

Question 9

Enzyme activity

A increases with increase in pH then remains constant

B decreases with increase in pH then remains constant

C increases with increase in pH then decreases

D decreases with increase in pH then increases

Question 10

The diagram illustrates a mode of action of enzymes.

This mode of action is called

A activation and binding.

B activation and breakdown.

C lock and catalysis.

D lock and key.

Question 11

Which factor is not necessary for the germination of seeds?

A light

B warmth

C oxygen

D moisture

Question 12

The diagram shows a cross section of a dicotyledonous root. Which part, A, B, C or D, is responsible for transporting organic molecules?

Question 13

Which condition results in rapid transpiration?

A low humidity

B low light intensity

C low temperature

D low wind speed

Question 14

Which one is an advantage of sexual reproduction?

A increase in genetic variation

B maintenance of desirable characteristics

C intense colonisation of an area

D reduction in competition with other species

Question 15

The diagram shows a bean seed cut in half. In which part, A, B, C or D, is food stored?

Question 16

The diagram shows one of the steps in testing a leaf for starch.

What is liquid X?

A water

B limewater

C alcohol

D iodine solution

Question 17

The graph shows results of an investigation on factors affecting the rate of photosynthesis.

Which factor is limiting the rate of photosynthesis when the curves are flat?

A carbon dioxide

B temperature

C light

D water

Question 18

A long term effect of smoking on the respiratory system is

A constriction of bronchioles.

B destruction of alveoli.

C increased mucus production.

D paralysis of cilia.

Question 19

Memory, intelligence and consciousness in the brain is controlled by the

A cerebellum.

B cerebrum.

C hypothalamus.

D medulla oblongata.

Question 20

Shortage of vitamin A in the diet leads to

A bleeding under the skin.

B formation of soft bones.

C poor healing of wounds.

D reduced resistance to disease.

Question 21

Which type of immunity will be acquired through vaccination?

A natural active

B artificial active

C natural passive

D artificial passive

Question 22

The diagram shows the structure of a tooth. Which part, A, B, C or D, is the hardest?

Question 23

The diagram shows the positions of the human endocrine glands.

Which hormone is secreted by gland 3?

A thyroxine

B adrenaline

C testosterone

D glucagon

Question 24

The diagram shows the growth curve of a rabbit.

Which is the best time to slaughter the rabbit?

A 6 weeks

B 8 weeks

C 10 weeks

D 12 weeks

Question 25

The diagram represents the menstrual cycle. At which stage, A, B, C or D, is fertilisation most likely to occur?

Question 26

Fungi are used in the production of

A yoghurt.

B penicillin.

C thyroxine.

D glucagon.

Question 27

The diagram shows the stages in the production of insulin by gene technology in random order.

The correct order of the stages is

A \(5 \rightarrow 3 \rightarrow 2 \rightarrow 4 \rightarrow 1 \rightarrow 6\).

B \(1 \rightarrow 2 \rightarrow 3 \rightarrow 4 \rightarrow 5 \rightarrow 6\).

C \(3 \rightarrow 5 \rightarrow 4 \rightarrow 6 \rightarrow 2 \rightarrow 1\).

D \(2 \rightarrow 4 \rightarrow 6 \rightarrow 5 \rightarrow 1 \rightarrow 3\).

Question 28

The approximate monohybrid ratio is

A \(1:1\).