JAMB Biology Past Questions & Answers - Page 286

1,426.

Unicellular organisms transport essential nutrients directly to all parts of their bodies by the process of diffusion because, they have 

A.

a large volume of surface area ratio

B.

a large surface area to volume ratio

C.

their bodies immersed in the nutrients

D.

their outer membrane made of cellulose

Correct answer is B

No explanation has been provided for this answer.

1,427.

Regulation of blood sugar level takes place in the

A.

pancreas

B.

ileum

C.

liver

D.

kidney

Correct answer is A

The pancreas produces the hormone, insulin, and secretes it into the bloodstream, where it regulates the body's glucose or sugar level. The islets of Langerhans are responsible for regulating blood glucose. They are groups of specialized cells in the pancreas that make and secrete hormones.

1,428.

In million's test, when the reagent is added to a protein food item, a white precipitate is produced which turns

A.

blue on heating

B.

yellow on heating

C.

green on heating

D.

red on heating

Correct answer is D

No explanation has been provided for this answer.

1,429.

In a water culture experiment, a plant showed poor growth and yellowing of the leaves. These may be due to deficiency in

A.

copper

B.

iron

C.

magnesium

D.

calcium

Correct answer is B

No explanation has been provided for this answer.

1,430.

The manufacture of carbohydrates by plants takes place only in

A.

the leaves

B.

the green stems

C.

chlorophyllous parts

D.

flowering plants

Correct answer is C

No explanation has been provided for this answer.