WAEC Biology Past Questions & Answers - Page 116

576.

The part of a leguminous plant where bacteria like Azotobacter can be found is

A.

at the nodes of the stem

B.

at the internodes

C.

in the root nodules

D.

in the spongy mesophyll

Correct answer is C

No explanation has been provided for this answer.

577.

A characteristic feature of plant parasites is the

A.

possession of holdfast

B.

possession of rhizoids

C.

development of hanging roots

D.

development of haustoria

Correct answer is D

A parasitic plant is one that derives some or all of its nutritional requirements from another living plant. All parasitic plants have modified roots, named haustoria (singular: haustorium), which penetrate the host plants, connecting them to the conductive system - either the xylem, the phloem, or both. This provides them with the ability to extract water and nutrient from the hosts. About 4,100 species in approximately 19 families of flowering plants are known.

578.

In a Biuret test, some protein was mixed with sodium hydroxide solution. Which of the following chemicals should be added to the mixture for a positive result?

A.

mercurous nitrate

B.

copper sulphate

C.

sodium carbonate

D.

silver nitrate

Correct answer is B

No explanation has been provided for this answer.

579.

A meal consisting of yam and a lot of vegetables is not balanced because it does not contain

A.

carbohydrates

B.

proteins

C.

vitamins

D.

minerals

Correct answer is B

No explanation has been provided for this answer.

580.

Why poor soil is treated with lime is to increase the quantity of

A.

nitrogen

B.

phosphorus

C.

carbohydrates

D.

sulphur

Correct answer is A

No explanation has been provided for this answer.