2021 - JAMB Biology Past Questions and Answers - page 3

21
The correct sequence for the perception of smell in mammals is?
A

chemicals --> olfactory nerve endings --> brain

B

dissolved chemicals --> nasal sensory cells --> brain

C

chemicals --> mucus membrane sensory cells --> brain

D

dissolved chemicals --> sensory cells --> olfactory nerve --> brain

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22
I. High birth rate and high immigration rate

II. Low birth rate and high immigration rate

III. Low mortality rate and low emigration rate

IV. High mortality rate and high emigration rate.

Which combination of the above can cause rapid over-crowding in climax biotic communities and human settlements? 

A

II and III

B

I and III

C

I and IV

D

I and II

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23
The number of plant species obtained from a population study of a garden is as follows: Guinea grass (15), Ipomoea spp (5), Sida spp (7) and Imperata spp (23)

What is the percentage of occurrence of Imperata spp?

A

35%

B

16%

C

46%

D

23%

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24
When a marine fish was taken from the ocean and put in a tank of fresh water, it died after a short period because? 
A

the tank was too small compared to the large-ocean

B

the body cells of the fish swelled and burst as a result of the hypotonic fresh water

C

the body cells of the fish shrank as their sap was hypertonic to the freshwater

D

there was no food in the tank, so the fish starved

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25
If a DNA strand has a base sequence TCA, its complementary strand must be?
A

ATG

B

TAG

C

GAT

D

AGT

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26
The two key cations involved in the action potential of nervous transmissions are?
A

Na+ and Fe2+

B

Mg2+ and K+

C

Na+ and K+

D

Fe2+ and Mg2+

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27
I. Rattus rattus. Il. Agama agama III. Bufo regularis IV. Tilapia  zillii
The order of evolutionary advancement of the above vertebrates is?
A

I, II, III, IV

B

I, IV, III, II

C

II, III, IV, I

D

IV, III, II, I

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28
Which of the following produces both hormones and enzymes?
A

Ileum

B

Pancreas

C

Gall bladder

D

Kidney

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29
The correct sequence of the movement of urea during urine formation is?
A

glomerulus ---> Bowman's capsule -> convoluted tubule ---> Henle's loop -> collecting- tubule

B

glomerulus -> Bowman's capsule -> convoluted tubule -> Henle's loop -> convoluted tubule -> collecting tubule

C

convoluted tubule -> glomerulus --> Nettle's loop -> Bowman's capsule->collecting tubule

D

convoluted tubule -> Bowman's capsule -> Henle's loop -7> glomerulus -> collecting tubule

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30
The order of passage of food in the digestive system is
A

ileum --> caecum ->large intestine -> rectum

B

ileum --> colon --> caecum -> rectum

C

large intestine --> ileum -> caecum -> rectum

D

colon -> caecum -> ileum -> rectum

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