JAMB Biology Past Questions & Answers - Page 85

421.

The total salt content in blood is about

A.

1.85 to 1.9%

B.

11.85 to 11.9%

C.

2.85 to 2.9%

D.

0.85 to 0.9%

Correct answer is D

The total salt content of blood plasma is approximately about 0.85 - 0.9%

422.

At what stage in this cycle can a man be infected?

A.

2

B.

4

C.

5

D.

6

Correct answer is B

In the animal’s intestine, the oncospheres hatch, invade the intestinal wall, and migrate to the striated muscles, where they develop into cysticerci. A cysticercus can survive for several years in the animal. Humans become infected by ingesting raw or undercooked infected meat.

423.

Tikka disease is related to the crop:

A.

Mustard

B.

Paddy

C.

Groundnut

D.

All of the above

Correct answer is C

Tikka Disease is a common disease in groundnut caused by Cercospora arachidicola and Cercospora personata. In the diseased condition, many circular spots appear on the surface of the leaf . The conidia of the fungus present in soil or those present in the fruit shell is the source of infection.

424.

A group of organism of the same species living together in a particular area is described as

A.

Colony

B.

Community

C.

Population

D.

Niche

Correct answer is C

Population is a group of organisms of the same species living in the same area at the same time, and which are capable of interbreeding.

425.

Which of the following is a mixed gland

A.

Pituitary

B.

Adrenal

C.

Pancreas

D.

Thyroid

Correct answer is C

A mixed gland has both endocrine and exocrine functions. The exocrine component has ducts through which its secretions pass. The pancreas is a gland with both endocrine (insulin production) and exocrine (production of digestive enzymes) functions.