JAMB Biology Past Questions & Answers - Page 18

86.

The part labelled II is?

A.

pellicle

B.

cytoplasmic connections

C.

flagella

D.

cells

Correct answer is B

Similar cytoplasmic bridges link the cells of all volvocacean embryos.

I.e neighboring cells are often joined together by strands of cytoplasm.

87.

An adaptive feature of camel to the desert is?

A.

ability to increase sweat production

B.

ability to pass high amount of urine

C.

ability to tolerate low degree of dehydration

D.

ability to tolerate high degree of dehydration

Correct answer is D

The hump present in the camel helps them travel long periods without water to survive in the desert's harsh conditions.

Thus the hump acts as a fat reserve or an energy reserve.

88.

The system of classification in which there are seven hierarchies from kingdom to species was introduced by?

A.

Felix Dujardin

B.

Carolus Linneus

C.

Theodore Schwann

D.

Charles Darwin

Correct answer is B

Carolus Linnaeus is the father of taxonomy, which is the system of classifying and naming organisms.

One of his contributions was the development of a hierarchical system of classification of nature.

Today, this system includes eight taxa: domain, kingdom, phylum, class, order, family, genus, and species.

89.

petaloid sepals serve the function of?

A.

carrying out photosynthesis

B.

attracting pollinating agents to a flower

C.

retaining pollen grains in the corolla tubes

D.

protecting the inner floral parts of the flower

Correct answer is D

They typically function as protection for the flower in bud, and often as support for the petals when in bloom.

90.

The under secretion of thyroxine in children results in?

A.

goitre

B.

gigantism

C.

kwashiorkor

D.

cretinism

Correct answer is D

Congenital hypothyroidism, previously known as cretinism, is a severe deficiency of thyroid hormone in newborns.

It causes impaired neurological function, stunted growth, and physical deformities