Jamb Biology Past Questions and Answers

Question 2246:

• JAMB 2021

Mass of a crucible = 10g,
Mass of a crucible and soil before heating =29g
Mass of a crucible and soil after heating = 18g
From the information above, determine the percentage of water in the given soil sample?

A. 20%
B. 25%
C. 40%
D. 60%

Question 2247:

• JAMB 2021

I. Stomata --> Spirogyra
II. Alveoli --> Earthworm
III. Malpighian tubule -> Mammal
IV. Contractile vacuole -> Protozoa

Which of the above structures is correctly matched with the organisms in which it is found?

A. II
B. I
C. IV
D. III

Question 2248:

• JAMB 2021

The sequence of the one-way gaseous exchange mechanism in a fish is?

A. Mouth --> operculum -> gills
B. Mouth -> gills > operculum
C. Operculum > gills -> mouth
D. Gills -> operculum --> mouth

Question 2249:

• JAMB 2021

The plants that grow in deserts or very dry areas are referred to as?

A. Hydrophytes
B. Epiphytes
C. Xerophytes
D. Mesophytes

Question 2250:

• JAMB 2021

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+