JAMB Biology Past Questions & Answers - Page 162

806.

I. Adopting appropriate nocturnal habits
II. Burrowing
III. Adjusting their internal body temperature.
IV Possessing many sweat pores.

Which of the above are ways desert animals adapt to the extreme heat of the environment?

A.

I and IV only

B.

ll and lll only

C.

l and ll only

D.

l, ll and, lll only

Correct answer is C

III & IV are considered invalid because some desert animals are poikilotherm.

Poikilotherm or cold blooded animals are the animals (without sweat pores) whose body temperature vary with the temperature of the environment.

e.g  Amphibians and reptiles are poikilothermic animals.

807.

The two halves of the pelvic girdle are joined together at the?

A.

pubic symphysis

B.

ilium

C.

pubis

D.

obturator foramen

Correct answer is A

The pubic symphysis is found on the anterior side of the pelvis and is the anterior boundary of the perineum. The pubic bones form a cartilaginous joint in the median plane, the symphysis pubis. The joint keeps the two bones of the pelvis together and steady during activity.

808.

Which of the following organisms is mainly found in the marine habitat?

A.

Achatina

B.

Tilapia

C.

Dog fish

D.

Tortoise

Correct answer is C

Dogfish are types of sharks that are common tropical open sea fishes, with others like mackerel, sea catfish, etc.

809.

The blood component that has the greatest affinity for oxygen is the

A.

lymphocytes

B.

leucocytes

C.

erythrocytes

D.

thrombocytes

Correct answer is C

No explanation has been provided for this answer.

810.

The barrier between maternal and fetal blood is the?

A.

placenta

B.

liver

C.

umbilical cord

D.

uterine wall

Correct answer is A

No explanation has been provided for this answer.