2022 - JAMB Biology Past Questions & Answers - page 1

1

sources of air pollutants are?

A

industrial chimneys, burning fossil oils and river dams

B

sulphurdioxide, acid rain and pesticides

C

sulphur dioxide, vehicle exhausts, and aerosols

D

sewage,smoke and old vehicles

CORRECT OPTION: c

The correct answer is Option C

Common sources of air pollution include household combustion devices, motor vehicles, industrial facilities, and forest fires. These sources release pollutants that are major public health concerns, including particulate matter, carbon monoxide, ozone, nitrogen dioxide, and sulfur dioxide.

2

The body of a snail is divided into head?

A

thorax and abdomen

B

visceral mass and abdomen

C

thorax and foot

D

visceral mass and foot

CORRECT OPTION: d

The correct answer is Option D

The main parts of a snail's body include the head, the visceral hump, and the foot.

3

An adaptation for defense in animals is?

A

croaking of a male toad

B

basking in lizard

C

spines in porcupine fish

D

huddling together of penguins

CORRECT OPTION: c

The correct answer is Option C

The body of the porcupine fish is covered in spines. The fish swells as a result of sucking in water, which makes the spines protrude. As a result, it changes from a little mouthful to an uneatable ball of sharp spines. A deadly poison is also present in its flesh as an additional defence.

4

The movement of Euglena towards the source of light is a?

A

tropic movement

B

tactic movement

C

nastic movement

D

kinetic movement

CORRECT OPTION: b

The correct answer is Option B

Motile micro-organisms or cells can change the direction of their locomotion in response to certain external stimuli. This change in direction of movement is called taxis and is a tactic movement.

5

During mitosis, the stage at which chromosomes lines up around the equator is?

A

telophase

B

metasphase

C

anaphase

D

prophase

CORRECT OPTION: b

The correct answer is Option B

Depending on how the chromosomes and spindle are physically, mitosis is thought to have five stages. Prophase, prometaphase, metaphase, anaphase, and telophase are these stages.

During mitosis, the genetic material carried in the nucleus of a parent cell is separated into two identical daughter cells. Metaphase, which is the third phase of this process, plays a critical role in this separation.

6

The waste product of insects is?

A

uric acid

B

urine

C

Mucilage

D

sweat

CORRECT OPTION: a

The correct answer is Option A

The primary nitrogenous waste product produced by the majority of terrestrial insects is uric acid. Uric acid is a highly insoluble and relatively non-toxic waste product.

As a result, it can crystallise out of solution and be either eliminated as a solid waste substance with low water loss or maintained in the body.

7

Succession that occurs on an abandoned farm land is?

A

tertiary

B

secondary

C

primary

D

climax

CORRECT OPTION: c

The correct answer is Option C

Ecological succession that starts in areas devoid of life, such as places with no soil or incapable of supporting life (such as regions with recent lava flows, newly formed sand dunes, or rocks left behind by retreating glaciers), is known as primary succession.

8

In Nigeria, Southern Guinea Savanna is found in?

A

Borno and Sokoto

B

Kogi and Kwara

C

Kaduna and Cross River

D

Kano and Niger

CORRECT OPTION: b

The correct answer is Option B

Parts of Oyo, Ondo, Osun, Kogi, and Kwara states in Nigeria contain the Southern Guinea Savanna.

9

Which of the following is associated with the dark stage of photosynthesis?

A

Assimilation of Carbon(IV)oxide

B

Photophosphorylation

C

Photolysis

D

Excitation of chlorophyll

CORRECT OPTION: a

The correct answer is Option A

The second stage of photosynthesis, also known as the biosynthetic or assimilatory stage, is called the Dark stage. During this stage, a complex set of reactions takes place that does not require solar light, converting carbon dioxide and other compounds into sugars.

The process of assimilation of carbon by some enzymes is dependent on solar light.

10

The part of mammalian skin that excretes metabolic wastes is?

A

sweat gland

B

horny layer

C

Malpighian layer

D

sebaceous gland

CORRECT OPTION: a

The correct answer is Option A

The body regulates temperature and removes waste by secreting water, sodium salts, and nitrogenous waste (such as urea) onto the skin surface using sweat glands.

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