Grade 12 Biology Paper 1 2015 Quiz

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Created on August 04, 2020

G12 Biology Paper 1 2015

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The diagram illustrates the effect of osmosis on a plant cell that has been placed in
liquid Q for several minutes.

Distilled water

Hypertonic solution

Hypotonic solution

Isotonic solution

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An organism being examined under a microscope was found to have three body
parts and three pairs of legs.
To which class of organisms does it belong?

Arachnida

Arthropoda

Diplopoda

Insecta

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The diagram shows a photosynthesising water plant. The rate of photosynthesis is
measured by bubbles of gas released.

Carbon dioxide

Chlorophyll

Light

water

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The table shows the results of two food samples that were tested.

Sample 1 contains starch and sugars

Sample 1 contains starch only.

Sample 2 contains starch and protein.

Sample 2 contains protein only.

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The diagram represents a cross section of a part of a plant.

dicotyledonous root

dicotyledonous stem

monocotyledonous root

monocotyledonous stem

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A green plant starts to wilt. It is then watered, and after a short time it recovers.
What process causes this recovery?

Assimilation

Active transport

Respiration

Transpiration

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When the skin is cut, the blood clots. In which order would the components of blood
become involved?

Fibrin → platelets → red blood cells → fibrinogen

fibrinogen → red blood cells → platelets → Fibrin

platelets → Fibrin → fibrinogen → red blood cells

platelets → fibrinogen → Fibrin → red blood cells

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The diagram below shows a double circulatory system. Which vessels carry oxygenated blood?

1 and 2

1 and 4

2 and 3

2 and 4

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Each alveolus has a large blood supply.

There are numerous alveoli in the lungs.

The walls of the alveoli are only one-cell thick.

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The diagram below shows the respiratory organs in fish.

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Chemicals in tobacco smoke lead to the break down of the tissue of the alveoli walls.
What name is given to this condition?

Bronchitis

Emphysema

Heart disease

Lung Cancer

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The diagram shows a simple dialysis machine.

amino acids.

fatty acids.

glucose.

urea.

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Which of the following is excreted by plants only?

Alkaloids

Carbon dioxide

Excess salts

Urea

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The diagram shows a shoot which has been placed horizontally. The shoot begins to
grow upwards.

increased cell division by meiosis at P.

Increased cell division by mitosis at P.

More cell elongation at P than at Q.

More cell elongation at Q than at P.

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Which two bones form the ball and socket joint of the shoulder?

Femur and pelvic girdle

Femur and Tibia

Humerus and Scapula

Ulna and Humerus

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The diagram below shows a vertebra.

Cervical

Lumbar

Thoracic

Sacral

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What type of seed dispersal is shown in the diagram?

Animal dispersal

Self dispersal

Water dispersal

Wind dispersal

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The diagram shows Irish potatoes in natural vegetative propagation.

Bulb

Corm

Root tuber

Stem tuber

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How is Bilharzia transmitted?

Inhaling contaminated air.

Shaking hands with an infected person.

Swimming in contaminated water.

Walking bare foot on the ground.

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BCG vaccination against tuberculosis is an example of ....

artificial active immunity.

natural active immunity

natural immunity.

natural passive immunity.

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1KJ

10KJ

100KJ

1000KJ

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Which of the following human features is an example of continuous variation?

Blood group

Foot size

sex

Types of teeth

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Which of the following effect of man on the ecosystem is reduced by proper
treatment of sewage?

Acid rain

Death of fish due to lack of oxygen

Increase in Carbon dioxide in atmosphere

Lack of soil nutrients

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A person with Down’s Syndrome is born with 47 chromosomes in each of his or her
cells instead of 46. What could cause this?

A mutation happened during the production of the ovum

More than one sperm fused with ovum at fertilization

Radiation caused a change in structure of gene in the father’s sperm

The mother was exposed to harmful chemicals while she was pregnant.

Your score is

The average score is 43%