Year : 
1978
Title : 
Biology
Exam : 
JAMB Exam

Paper 1 | Objectives

11 - 20 of 50 Questions

# Question Ans
11.

The function of lenticels is

A. to remove excess water in plant

B. to absorb water from the atmosphere

C. for gaseous exchange

D. to absorb light

E. to store food

Detailed Solution

A lenticel is one of many raised pores in the stem of a woody plant that allows gas exchange between the atmosphere and the internal tissues.
12.

The following events take place during conjugation in spirogyra 1. The protoplasm of each of the conjugating cell separate from the cell wall to form a Gamete; the gamete of one filament passes through the conjugation tube to meet the gamete of the other filament 2. The zygote soon become surrounded by thick brown wall to become zygospore which burst after a short rest and germinate to produce a new filament 3. The nuclei of the gametes fuse to form a zygote 4. The protuberance meet and where th

A. 1,2,3,4,5

B. 1,2,4,5,3

C. 3,4,5,2,1

D. 5,4,1,3,2

E. 5,4,3,1,2

Detailed Solution

Sexual reproduction in Spirogyra occurs by a process known as conjugation, in which cells of two filaments lying side by side are joined by outgrowths called conjugation tubes. This allows the contents of one cell to completely pass into and fuse with the contents of the other. The resulting fused cell (zygote) becomes surrounded by a thick wall and overwinters, while the vegetative filaments die.
13.

Which of the following is a characteristic of animal cell?

A. Presence of chloroplast

B. possession of cellulose cell-wall

C. absence of large vacuoles

D. presence of large vacuoles

E. presence of chromosome

Detailed Solution

Unlike the plant cell which possesses one or a few large vacuoles, the animal cell possesses vacuoles but they are smaller in size and plenty in quantity when compared to that of the plants.
14.

Nitrifying bacteria keep the soil fertile by

A. converting nitrate to nitrogen

B. converting ammonium salt to nitrate

C. converting atmospheric nitrogen to plant nitrogen

D. converting nitrate to nitrous oxide

E. converting atmospheric nitrogen to nitrates

Detailed Solution

Nitrifying bacteria are microorganisms that help to convert soil ammonium to nitrates, the form in which it is usable by the plants.
15.

In the life history of schistosoma (Bilharzia), one of the following is intermediate host

A. man

B. snail

C. mosquito larva

D. crayfish

E. fish

Detailed Solution

Bhilharzia is another name for snail fever, which attacks primarily the snail's urinary tract.
16.

In which of the following groups of organisms do all the members have asexual method of reproduction?

A. A geen filament algae, a flowering plant and a bird

B. A toad (or frog) , ameoba and mucor ( penicillium)

C. A flowering plant, tape worm (or ascaris) and a green filamentous algae

D. Mucor (or penicillium), a bird and a toad (or frog)

E. Ameoba, mucor (or penicillium ) and a green filamentous algae

Detailed Solution

Amoeba reproduces by binary fission which is a form of asexual reproduction. Also, the mucor as well as the green algae reproduce asexually .
17.

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

Detailed Solution

The adrenalin is a hormone which is released in times of danger. It is produced in the adrenal gland.
18.

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

Detailed Solution

The ecology of ecosystem has to do with the study of every factor living (biotic) and non- living (abiotic), which affects the population.
19.

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

Detailed Solution

The amount of water lost is (18.9 - 17.9)g = 1g. Hence, the water lost by the shoot is 1g.
20.

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

Detailed Solution

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.
11.

The function of lenticels is

A. to remove excess water in plant

B. to absorb water from the atmosphere

C. for gaseous exchange

D. to absorb light

E. to store food

Detailed Solution

A lenticel is one of many raised pores in the stem of a woody plant that allows gas exchange between the atmosphere and the internal tissues.
12.

The following events take place during conjugation in spirogyra 1. The protoplasm of each of the conjugating cell separate from the cell wall to form a Gamete; the gamete of one filament passes through the conjugation tube to meet the gamete of the other filament 2. The zygote soon become surrounded by thick brown wall to become zygospore which burst after a short rest and germinate to produce a new filament 3. The nuclei of the gametes fuse to form a zygote 4. The protuberance meet and where th

A. 1,2,3,4,5

B. 1,2,4,5,3

C. 3,4,5,2,1

D. 5,4,1,3,2

E. 5,4,3,1,2

Detailed Solution

Sexual reproduction in Spirogyra occurs by a process known as conjugation, in which cells of two filaments lying side by side are joined by outgrowths called conjugation tubes. This allows the contents of one cell to completely pass into and fuse with the contents of the other. The resulting fused cell (zygote) becomes surrounded by a thick wall and overwinters, while the vegetative filaments die.
13.

Which of the following is a characteristic of animal cell?

A. Presence of chloroplast

B. possession of cellulose cell-wall

C. absence of large vacuoles

D. presence of large vacuoles

E. presence of chromosome

Detailed Solution

Unlike the plant cell which possesses one or a few large vacuoles, the animal cell possesses vacuoles but they are smaller in size and plenty in quantity when compared to that of the plants.
14.

Nitrifying bacteria keep the soil fertile by

A. converting nitrate to nitrogen

B. converting ammonium salt to nitrate

C. converting atmospheric nitrogen to plant nitrogen

D. converting nitrate to nitrous oxide

E. converting atmospheric nitrogen to nitrates

Detailed Solution

Nitrifying bacteria are microorganisms that help to convert soil ammonium to nitrates, the form in which it is usable by the plants.
15.

In the life history of schistosoma (Bilharzia), one of the following is intermediate host

A. man

B. snail

C. mosquito larva

D. crayfish

E. fish

Detailed Solution

Bhilharzia is another name for snail fever, which attacks primarily the snail's urinary tract.
16.

In which of the following groups of organisms do all the members have asexual method of reproduction?

A. A geen filament algae, a flowering plant and a bird

B. A toad (or frog) , ameoba and mucor ( penicillium)

C. A flowering plant, tape worm (or ascaris) and a green filamentous algae

D. Mucor (or penicillium), a bird and a toad (or frog)

E. Ameoba, mucor (or penicillium ) and a green filamentous algae

Detailed Solution

Amoeba reproduces by binary fission which is a form of asexual reproduction. Also, the mucor as well as the green algae reproduce asexually .
17.

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

Detailed Solution

The adrenalin is a hormone which is released in times of danger. It is produced in the adrenal gland.
18.

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

Detailed Solution

The ecology of ecosystem has to do with the study of every factor living (biotic) and non- living (abiotic), which affects the population.
19.

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

Detailed Solution

The amount of water lost is (18.9 - 17.9)g = 1g. Hence, the water lost by the shoot is 1g.
20.

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

Detailed Solution

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.