WAEC Biology Past Questions & Answers - Page 58

286.

In which of the plant tissues are guard cells located?

A.

Epidemis

B.

MesophyII

C.

Vascular bundles

D.

Meristems

Correct answer is A

No explanation has been provided for this answer.

287.

The steps below are involved in the testing of a leaf for starch. Study them carefully and answer the question:

I. Decolorize them

II. Dip decolorized leaf in warm water

III. Place leaf in boiling water

IV. Add iodine solution

The best time to pluck the leaf for the experiment is?

A.

after being exposed to sunlight

B.

three hours after sunset

C.

before sunrise

D.

six hours after sunset

Correct answer is A

The leaf that was in the light turns blue-black, which demonstrates that the leaf has been performing photosynthesis and producing starch.

288.

The best time to pluck the leaf for the experiment is

A.

after being exposed to sunlight

B.

three hours after sunset

C.

before sunrise

D.

six hours after sunset

Correct answer is A

No explanation has been provided for this answer.

289.

The steps below are involved in the testing of a leaf for starch. Study them carefully and answer the question:

I. Decolorize them

II. Dip decolorized leaf in warm water

III. Place leaf in boiling water

IV. Add iodine solution

The CORRECT order for the test is?

A.

I, II, III and IV

B.

I, III, II and IV

C.

II, III,, I and IV

D.

III, I, II and IV

Correct answer is D

No explanation has been provided for this answer.

290.

Which of the following parts of the ear does NOT contain endolymph?

A.

Semi-circular canals

B.

Utriculus

C.

Tympanum

D.

Sacculus

Correct answer is A

No explanation has been provided for this answer.