JAMB Biology Past Questions & Answers - Page 61

301.

The function of ribosomes in cells is

A.

protein synthesis

B.

starch synthesis

C.

transporting materials

D.

lipid storage

Correct answer is A

A ribosome is a cell organelle. It functions as a micro-machine for making proteins.

302.

The theory of natural selection was postulated by

A.

Gregor Mendel

B.

Matthias Schleiden

C.

Charles Darwin

D.

Robert Hook

Correct answer is C

No explanation has been provided for this answer.

303.

The hypha of rhizopus is said to be non-septate because it

A.

does not contain chloropyll

B.

has no cross wall

C.

is vacuoled

D.

stores oil globus

Correct answer is B

Hyphae that have walls between the cells are called septate hyphae; hyphae that lack walls and cell membranes between the cells are called nonseptate or coenocytic hyphae)

304.

Epiphytes growing on the branches of trees provide an example of the relationship known as

A.

parasitism

B.

commensalism

C.

saprophytism

D.

holophytism

Correct answer is B

Commensalism is a type of symbiosis, specifically, a biological relationship in which one specie benefits from an interaction, while the host species is neither positively or negatively affected to any tangible degree.

305.

In an agricultural ecosystem, the biotic component consist of

A.

crops, pests, and beneficial insects

B.

crops, temperature, and humidity

C.

pests, beneficial insects, and water

D.

crops, water, and soil

Correct answer is A

The living components of an ecosystem are called the biotic components, option A has all living components.