JAMB Biology Past Questions & Answers - Page 420

2,096.

The neck region of the tape worm, (taenia) is responsible for the

A.

production of egg

B.

storage of egg

C.

formation of new segment

D.

development of the suckers

E.

fragmentaion of the body segment

Correct answer is C

The adult tapeworm possesses a series of flat, rectangular body segments, or proglottids, generated by the neck.

2,097.

At fertilization

A.

one chromosome from the male joins another from the female

B.

one gene from the male combines with another from the female

C.

the male nucleus fuses with the female nucleus

D.

one set of chromosome combines with another set from the female

E.

one cell from the male fuses with another from the female

Correct answer is C

Fertilization is the union of a spermatozoal nucleus, of paternal origin, with an egg nucleus, of maternal origin, to form the primary nucleus of an embryo.

2,098.

A potometer with a leafy shoot weighed 18.9g initially and weighed 17.9g after one hour. From this it follow that

A.

the shoot absorbed 1g of water per hour

B.

1g of water per hour evaporates from the potometer

C.

the shoot lost 1g of water per hour

D.

the potometer water receded at the rate of 1g per hour

E.

the shoot was respiring and lost weight at rate of 1g per hour

Correct answer is C

The amount of water lost is (18.9 - 17.9)g = 1g. Hence, the water lost by the shoot is 1g.

2,099.

The study of organism and the environment of an abandoned farmland is the ecology of?

A.

a community

B.

a population

C.

a specie

D.

a habitat

E.

 an ecosystem

Correct answer is E

The ecology of ecosystem has to do with the study of every factor living (biotic) and non- living (abiotic), which affects the population.

2,100.

The hormone which tones up the muscles of a person in time of danger is from the

A.

thyroid gland

B.

pancreas

C.

adrenal gland

D.

liver

E.

spleen

Correct answer is C

The adrenalin is a hormone which is released in times of danger. It is produced in the adrenal gland.