WAEC Biology Past Questions & Answers - Page 10

46.

The ability of organisms to maintain a constant internal environment is known as

A.

diuresis

B.

plasmolysis

C.

endosmosis

D.

homeostasis

Correct answer is D

The ability of organisms to maintain a constant internal environment is known as "homeostasis." Homeostasis is a fundamental biological concept that refers to the ability of living organisms to maintain a stable and relatively constant internal environment despite changes in the external environment.

47.

The type of nutrition in which organisms take solid organic materials into their body is

A.

parasitic

B.

holozoic

C.

saprophytic

D.

symbiotic

Correct answer is B

Holozoic nutrition is a type of nutrition in which organisms consume solid organic materials. This is the type of nutrition seen in most animals, where food is ingested and then broken down through digestion. This is different from symbiotic (where two organisms live together and benefit from each other), saprophytic (where organisms feed on dead and decaying matter), and parasitic (where one organism benefits at the expense of another) nutrition.

48.

The organ which is sensitive to light in Euglena is the

A.

gullet

B.

chloroplast

C.

eye spot

D.

contractile vacuole

E.

flagellum

Correct answer is C

No explanation has been provided for this answer.

49.

The process by which the amount of water and solutes in the blood is controlled is known as 

A.

hemolysis

B.

diffusion

C.

turgidity

D.

osmoregulation

Correct answer is D

No explanation has been provided for this answer.

50.

Diagram J is a protease while diagrams K, L, M, and N are food substances. Study them and answer this question.

Protease J would react with the particular illustrated substance because enzymes? 

A.

K

B.

L

C.

M

D.

N

Correct answer is B

No explanation has been provided for this answer.