Biology Past Questions And Answers
The complex relationship between the members of a community and their physical environment is known as________
- A. commensalism
- B. symbiosis
- C. saprophytism
- D. ecology
(a) Explain the term, conservation of natural resources.
(b)(i) List seven methods of soil conservation.
(ii) Name four other natural resources that may be conserved.
(c) State three factors which negatively affect conservation of forest in West Africa.
(d) Describe what happens during the denitrification stage of the nitrogen cycle.
View Discussion (0)WAEC 2006 THEORYThe classes of plants the root systems in diagrams I and II above represent respectively are______________
- A. Dicotyledoneae and Monocotyledoneae
- B. Monocotyledoneae and Dicotyledoneae
- C. Dicotyledoneae and Dicotyledoncae
- D. Monocotyledoneae and Monocotyledoneae
(a) Make a diagram 8 — 10 cm long to show the relative position of the following organs in the mammalian gut:
(i) stomach
(ii) pancreas
(iii) liver
(iv) gall bladder
(v) duodenum and label fully.
(b) (i) List two diseases of the liver.
(ii) State five effects of the diseases in (b) (i) on the human body.
(c) State the deficiency symptoms of the following vitamins:
(i) vitamin A
(ii) vitamin C
(ii) Vitamin K;
View Discussion (0)WAEC 2011 THEORYThe modification in structure, physiology and behaviour of plant and animal is called ______
- A. adaptation
- B. evolution
- C. variation
- D. succession
The continuity of an ecosystem depends on constant flow of energy and circulation of matter. However, the amount of energy passed on from decomposers to producers should be
- A. great
- B. small
- C. reversible
- D. zero
Which of the following pH values is the best for the action of the enzymes - renin and pepsin in the stomach?
- A. pH2
- B. pH7
- C. pH8
- D. pH9
Which of the following statement about the similarities in plant and animal transport is correct?
- A. Materials and hormones are transported in fluid form
- B. The transport medium is made up of only tissues
- C. Their materials are transported in the same vessels
- D. Diffusion is not required
Sickle-cell anaemia has persisted in the human race due to
- A. lack of proper medical care for sicklers
- B. carriers being more resistant to malaria
- C. mosquito vectors
- D. wildlife intermediate hosts
Which of the following is a biotic component of an ecosystem?
- A. Soil
- B. Rainfall
- C. Light
- D. Fungi