WAEC Biology Past Questions & Answers - Page 81

401.

The ascent of water in tall trees is mainly due to 

A.

adhesive forces

B.

transpiration pull

C.

root pressure

D.

cohesive forces

Correct answer is B

Transpiration pull or the suction force is the force which aids in drawing the water upward from roots to leaves which is used by the leaves for photosynthesis and excess is released through the stomata.

402.

By what process is starch converted into maltose?

A.

Hydrolysis

B.

Condensation

C.

Translocation

D.

Photosynthesis

Correct answer is A

Carbohydrates are broken down into their component sugars by hydrolysis. This type of hydrolysis is called Saccharification.

403.

One major difference between plant and animal nutrition is the ability of plants to synthesize

A.

Food for plants and animals

B.

Water for plants

C.

Water for animals

D.

Food for plants only

Correct answer is A

The food produced by plants serve as food both for the plants and animals (herbivores and in extension, all animals).

404.

The source of energy required by plants during food production is

A.

Photosynthesis

B.

Chlorophyll

C.

Sunlight

D.

Microorganisms

Correct answer is C

The food production process (photosynthesis) makes use of the energy of light for the process.

405.

In the diagram above, the larva is also known as

A.

Nymph

B.

Caterpillar

C.

Maggot

D.

Chrysalis

Correct answer is B

The diagram is the life cycle of a butterfly whose larva is called caterpillar.