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 diseases is caused by a bacterium?
ringworm
poliomyelitis
syphilis
malaria
Correct answer is C
Syphilis is caused by a bacterium known as Trepenoma pallidum. It is majorly sexually transmitted.
When large numbers of organisms share limited space and resources, the immediate result is
extinction
emigration
competition
immigration
Correct answer is C
Competition in a territory is as a result of a hassle for the available resources within the territory. For instance, when the water in a river seems to be drying out, the organisms in the water begin to compete for the water.
commensalism
predation
parasitism
mutualism
Correct answer is C
A parasite is an organism that lives on or in a host organism and gets its food at the expense of its host.
Xerophytes have the following characteristics aimed at conserving water except
thick cuticle
broad leaf surfaces
sunken stomata
waxy cuticle
Correct answer is B
The xerophytes have reduced leaf size in order to reduce the surface area, thereby reducing the water loss in the plant.
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.