Waec 2009 Biology Past Questions And Answers
Which of the following treatments would increase the rate of transpiration in a potted plant?
- A. Placing it in a cold room
- B. Placing it under a fan in a room
- C. Putting it in a cupboard
- D. Smearing grease on the lower surface of the leaves
P ? Q ? R ? S ? T
The organism designated P in the food chain above is normally sustained by energy from- A. sunlight
- B. carbohydrates
- C. green plants
- D. mineral salts
Pepsin is secreted as an inactive precursor called pepsinogen because
- A. pepsin as an enzyme is quickly destroyed by the alkaline food from the mouth
- B. all digestive enzymes pass through a precursor stage
- C. pepsin is a proteolytic enzyme and might attack the stomach tissues
- D. pepsin is not required in large quantities
Which of the following instruments is used to estimate the number of plants in a habitat?
- A. Pooter
- B. Pitfall trap
- C. Quadrat
- D. Sweep net
A group of closely related organisms capable of interbreeding to produce fertile offspring are known as members of a
- A. kingdom
- B. class
- C. family
- D. species
An organism whose source of carbon is inorganic is likely to be a/an
- A. heterotrophic organism
- B. autotrophic organism
- C. symbiotic organism
- D. parasitic organism
(a) Explain why an athlete in a race would be given a glucose drink rather than a piece of bread.
(b) Outline the test for starch in a given food substance.
(c) State five reasons why water is important in human diet.
View Discussion (0)WAEC 2009 THEORYWhich of the following statements about ecosystems is false?
- A. All the energy entering the ecosystem is passed on to decomposers
- B. The primary producers provide energy for herbivores and carnivores
- C. Ecosystems must start with the capture of energy by autotrophs
- D. Energy transfer from one trophic level to the other is not 100% efficient.
Spectacles with convex lenses correct long-sightedness by
- A. converging the light rays before they enter the eye.
- B. diverging the light rays before they enter the eye.
- C. reducing light intensity before it enters the eye
- D. increasing light intensity before it enters the eye
(a) With the aid of annotated diagrams only, outline the water cycle.
(b) Describe an experiment to show that water is conducted in the xylem tissue of flowering plants.
View Discussion (0)WAEC 2009 THEORY