Question 11:

• JAMB 2019

The function of lenticels is

A. To absorb water from the atmosphere
B. To remove excess water in plant
C. For gaseous exchange
D. To absorb light
E. To store food

Question 12:

• JAMB 2019

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 they touch the cell-wall disappear so that a conjugation tube joining the two cell is formed 5. protuberance appear on the wall of the cell of two filament of spirogyra lying side by side opposite one another. Now what is the correct sequence in which the above sequence occur?

A. 3,4,5,2,1
B. 1,2,3,4,5
C. 1,2,4,5,3
D. 5,4,3,1,2
E. 5,4,1,3,2

Question 13:

• JAMB 2019

Which of the following is a characteristic of animal cell?

A. Presence of chromosome
B. Absence of large vacuoles
C. Presence of large vacuoles
D. possession of cellulose cell-wall
E. Presence of chloroplast

Question 14:

• JAMB 2019

Nitrifying bacteria keep the soil fertile by

A. converting ammonium salt to nitrate
B. Converting atmospheric nitrogen to plant nitrogen
C. Converting nitrate to nitrogen
D. Converting nitrate to nitrous oxide
E. Converting atmospheric nitrogen to nitrates

Question 15:

• JAMB 2019

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

A. Snail
B. Mosquito larva
C. Crayfish
D. Fish
E. Man