JAMB Biology Past Questions & Answers - Page 422

2,106.

One of the function of xylem is

A.

strengthening the stem

B.

manufacturing food

C.

reducing loss of water

D.

conducting manufactured food

E.

storing unused sugar

Correct answer is A

.Xylem plays an essential 'supporting' role providing strength to tissues and organs, to maintain plant architecture and resistance to bending.

2,107.

Given the equation:
6CO2 + 6H2O → C6H12O6 + 6O2 {Under sunlight & Chlorophyll)
The oxygen given off during the above process is derived from

A.

sunlight

B.

chlorophyll

C.

carbon dioxide

D.

atmosphere

E.

water

Correct answer is E

The oxygen given of by plants is from WATER which is split during photolysis(splitting of water by sunlight).

2,108.

A plant which grows on another plant without apparent harm to the host plant is called

A.

a parasite

B.

an epiphyte

C.

a saprophyte

D.

a predator

E.

 a hermaphrodite

Correct answer is B

Epiphytes, which differ from parasites in the sense that epiphytes grow on other plants for physical support and do not necessarily negatively affect the host. Hence, epiphytes show no apparent harm to the host plant.