Waec 2013 Biology Past Questions And Answers
Which of the following factors is likely to increase the rate of transpiration in plants?
- A. A reduction in the number of stomata per unit surface area
- B. Increase in humidity around the leaves of plants
- C. An increase in leaf surface area to volume ratio
- D. Removal of leaves from plant
The bacteria that reduce nitrates in the soil into gaseous nitrogen are referred to as
- A. nitrifying bacteria
- B. denitrifying bacteria
- C. putrefying bacteria
- D. saprophytic bacteria
The name of the enzyme that catalyses the conversion of glucose to glucose-6-phosphate at the beginning of glycolysis is
- A. phospho-fructokinase
- B. glucose isomerase
- C. hexokinase
- D. glucose-6-kinase
The maximum size of a population that a given area can support is known as
- A. population density
- B. carrying capacity
- C. population growth
- D. maximum population
(a)(i) What is excretion?
(ii) List the excretory organs in humans and name one waste product excreted by each organ
(B) Name the excretory organs in:
(i) insects
(ii) earthworms.
View Discussion (0)WAEC 2013 THEORYThe correct arrangement of food classes of the same quantity in the order of magnitude of energy value in animals in descending order is
- A. Carbohydrates, fats and oils, water, protein
- B. Fats and oils, carbohydrates, protein, water
- C. Water, fats and oils, carbohydrates, protein
- D. Protein, fats and oils water and carbohydrates
(a) What is photosynthesis?
(b) List: (i) four external factors
(ii) two internal factors; that affect the rate of photosynthesis.
(c)(i)List the major products of the light dependent stage of photosynthesis.
(ii)State the importance of each of the products listed in (c)(i) above.
(d)(i) Explain why there are no green plants at the lower depths of some lakes.
(ii) State why decomposers are important to flowering plants.
View Discussion (0)WAEC 2013 THEORYWhich of the following associations is an example of epiphytism?
- A. Lice in the human hair
- B. Mistletoe on citus fruit.
- C. Egret on cow
- D. Fern on palm tree
Which of the following conditions would result result in a decrease in the production of antidiuretic hormone?
- A. Abnormally high blood sugar level
- B. Drinking large quantities of water
- C. Increase in osmotic pressure of blood
- D. Period of strenuous exercise
A pyramid of numbers is constructed by
- A. comparing living and non-living things
- B. measuring productivity
- C. conducting census
- D. labelling the living organisms