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.
In an ecosystem, the least efficient energy transfer link is from the
secondary consumers to decomposers
sun to producers
primary consumers to secondary consumers
producer to primary consumers
Correct answer is A
From the food chain, the energy flows from the producers to the primary consumer to the secondary consumers and about 90% of the energy is lost in the process of this transfer. Hence, the energy level by the time it gets to the secondary consumers. There is less energy transferred to the decomposers.
Which of the following instruments is used to determine the turbidity of water?
hygrometer
hydrometer
secchi disc
rain gauge
Correct answer is C
The secchi disc is used to check for the transparency and the turbidity of water.
light energy
low humidity
oxygen
nitrate
Correct answer is A
Proper light in the aquarium serves as a form of energy for the photosynthetic plants and animals, hence it is very important.
The most important factor(s) that influence(s) the ecological niche of an organism is/are the
water, light, and predator-prey relationship
food and water availability
physical environment
competition for food and space
Correct answer is D
The competition in a territory is the factor that basically determines whether or not a specie will survive or not in that territory. Ecological niche is the total package of the habits of a specie. The competition for food and water is the most important influencer of the ecological niche.
highest in sandy soil
lowest in loamy soil
to the same level in all soil types
highest in clayey soil
Correct answer is D
Capillarity in soil refers to the ability of a soil to allow and retain water. Clayey soil has the highest tendency to hold water hence, the water would rise highest in it.