SSCE/WASSCE/GCE PAST QUESTIONS AND ANSWERS
OBJECTIVES
1.
Stomatal pores open when
there is
A. an increase in the sugar content of
guard cells
B. a decreases in the osmotic concentration
of the guard cell
C. a decrease in the sugar content of
mesophyll cells
D. an increase in the sugar content of mesophyll cells
2.
In the woody stems, gaseous
exchange takes place through the
A. micropyles C. lenticels
B. stomata D. vessels
3. The opening of the stoma is controlled by the
A. presence of a pore
B. increase in solute concentration in
the guard cells
C. presence of guard cells
D. decrease in solute concentration in the guard cells
4. The opening and closing of the stoma are regulated by
A. transpiration C. diffusion
B. respiration D. osmosis
5. The
stomatal pore is controlled by
A. epidermal cells
C. mesophyll cells
B. guard cells D. subsidiay cells
Answers
|
1. A |
2. C |
3. B |
4. D |
5. B |
LIKELY
QUESTION
1. Name three structures of plant that involved in
gaseous exchange
2. Explain how gaseous exchange occur through (i).
stomata (ii). lenticel
3. Draw and label the structures involved in gaseous
exchange
Click Here for WAEC Past Questions and Answers
