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WAEC Past Questions and Answers - Page 1747

8,731.

Which of the following agronomic practices is not applicable to rice production?

A.

Threshing

B.

Transplanting

C.

Staking

D.

Puddling

Correct answer is C

No explanation has been provided for this answer.

8,732.

The gas produced when a mixture of sodium propanoate and soda lime is heated is

A.

methane

B.

pentane

C.

ethane

D.

butene

E.

ethyne

Correct answer is C

So during the presence of methane, sodium ethanoate with soda lime is used, using sodium propanoate with sodium will produce ethane according to the equation below

\CH3CH2COONa+NaOHC2H6+Na2CO3\

8,733.

Fructose and glucose are classified as carbohydrates because they

A.

are crystalline white solids

B.

are energy -giving substances

C.

are naturally occurring organic compounds

D.

contain carbon oxygen and hydrogen

E.

conform to the general formula Cx(H2O)y

Correct answer is E

No explanation has been provided for this answer.

8,734.

A plant not normally used as green manure is

A.

Mucuna utilis

B.

Sida acuta

C.

Centrosema pubescens

D.

Pueraria phaseoloides

Correct answer is B

No explanation has been provided for this answer.

8,735.

Which of the following sequence of pre-planting operation is correct?

A.

Bush clearing, farm layout, burning and stumping

B.

Stumping, bush clearing, farm layout and burning

C.

Burning, farm layout, clearing and stumping

D.

Bush clearing, burning, stumping and farm layout

Correct answer is D

No explanation has been provided for this answer.