21. Which of the following types of placentation is not common amongst syncarpous pistils?
- A. Marginal
- B. Axile
- C. Parietal
- D. Free central
Correct Option: Answer is A
Marginal placentation– The ovary in which the placenta forms a ridge along the ventral suture of the ovary and the ovules develop on two separate rows is known to have marginal placentation
22. The complex energy-rich organic matter which living organisms need for life is
- A. water
- B. air
- C. food
- D. mineral salts
Correct Option: Answer is C
23. Which of the following processes are associated with photosynthesis? I. Energy from sunlight is absorbed II. Carbon dioxide is evolved III. Oxygen is given off IV. Glucose is synthesized
- A. I and II only
- B. I, II and IV only
- C. I, III and IV only
- D. I, II, III and IV
Correct Option: Answer is C
24. Which of the following function is associated with calcium in plants? Formation of
- A. cell wall
- B. ribosomes
- C. proteins
- D. cell membrane
Correct Option: Answer is A
25
The diagram above shows the dentition of an organism. What organism is this?
- A. rabbit
- B. cat
- C. frog
- D. man
Correct Option: Answer is D
WAEC
26.
The diagrams below show the dentition of an organism. The function of the teeth labelled X is for
- A. biting and grasping
- B. chewing and grinding
- C. tearing and grasping
- D. chewing and tearing
Correct Option: Answer is C
Canine: They have a sharp, pointed biting surface. Their function is to grip and tear food. There are four canine teeth in both primary and permanent dentitions. The premolars, unlike the incisors and canines, have a flat biting surface.
27.
The teeth which are absent in the young of the organism whose dentition is shown above is labelled
- A. W
- B. X
- C. Y
- D. Z
Correct Option: Answer is D
Premolars and molars
28. The number of individuals that the environment can support over a long period of time is its
- A. growth rate
- B. total capacity
- C. population capacity
- D. carrying capacity
Correct Option: Answer is C
29. A good site for secondary succession would be
- A. a sand dune
- B. a bare rock
- C. a land that has just had forest fire
- D. a stretch of barren land
Correct Option: Answer is C
30 A population which exceeds its carrying capacity and then collapses is represented graphically by a
- A. bell-shaped curve
- B. linear curve
- C. sigmoid curve
- D. skewed curve