Waec 2011 Biology Past Questions And Answers
A xerophyte conserves water by possession of the following features except
- A. thick cuticle
- B. sunken stomata
- C. broad leaves
- D. fleshy stem
Which of the following statements is not true about continuous variation? It
- A. is usually controlled by several genes
- B. can be influenced by environmental factors
- C. follows a normal distribution curve
- D. is usually controlled by one or two pair(s) of genes
The falling off of leaves of deciduous trees is helpful to the plant because it
- A. reduces the rate of transpiration
- B. enables the plant to conveniently eliminate its excretory products
- C. enables the plant to bear more fruits
- D. ensures that the limited mineral salts get to only growing regions
Leguminous crops are incorporated into crop rotation in order to
- A. improve aeration of the soil.
- B. promote nitrogen fixation
- C. increase the rate of soil formation
- D. improve upon the water holding capacity of the soil
Which of the following cells are not regarded as specialized?
- A. Sperm cells
- B. Root up cells
- C. Muscle cells
- D. somatic cells
A sample of wet garden soil of known weigh was heated to constant weight. The loss of weight is due to loss of
- A. water
- B. organic matter
- C. water and organic matter
- D. water and inorganic matter
(a)State the second law of thermodynamics.
(ii) Use the second law of thermodynamics to explain the flow of energy across different trophic levels in a food chain.
(b) (I) State three factors that can likely limit the size of human populations.
(ii) Outline two ways each by which humans can overcome the factors named in (b)(i).
View Discussion (0)WAEC 2011 THEORYWhich of the following methods does not make water fit for drinking?
- A. Addition of chlorine
- B. Boiling
- C. Distillation
- D. Addition of alum
What will be the chromosome number of the hybrid of two varieties of a plant with 36 chromosomes in the endosperm cell?
- A. 12
- B. 24
- C. 35
- D. 48
(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 THEORY