How well do you understand living things and their vital processes? Whether you are preparing for JAMB, WAEC, NECO and Post-UTME, these Biology past questions and answers cover such subjects as the chemistry of life, botany, evolution, genetics, ecology etc to help you know what to expect, improve your speed and confidence and be really prepared for the actual aptitude test.
Which of the following substances has the highest amount of energy in joules per unit weight?
Carbohydrates
Fats
Proteins
Vitamins
Correct answer is B
Fats provide more energy to animals than carbohydrates therefore containing the highest amount of energy in joules per unit weight.
Competition among individuals of a population increases the
Number of organisms
Availability of nutrient supplied
Survival of the fittest
Enlargement of the territory
Correct answer is C
Competition one of the biotic factors in ecological factors involves the interactions among two organisms of the same species/different species which outgrows the other and survives while the other cannot grow or survive
Trees in Savanna habitats usually have thick bark which mainly
Reduces the rate of transpiration
Protects them from the scorching sun
Protects them from heavy winds
Resists bush fires
Correct answer is A
Rate of transpiration is reduced in savannah forest due to thick barks of the trees in savannah forest.
Which of the following substances pass through the root cell membrane by osmosis?
Cell sap
Carbon dioxide
Oxygen
Water
Correct answer is D
Water passes through the root cell membrane of plants in order for osmosis to take place.
Excess amino acids are converted into urea by the
heart
kidney
liver
muscles
spleen
Correct answer is C
No explanation has been provided for this answer.