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 factors can reduce the population of a community?
Immigration
edaphic
predation
mutualism
Correct answer is C
Predation include all interactions in which one organism consumes all or part of another. This includes predator-prey, herbivore-plant, and parasite-host interactions.
Migration is the movement of individuals of a species from one place to another.
Mutualism is the way two organisms of different species exist in a relationship in which each individual benefits from the activity of the other.
Edaphic factor is an abiotic factor relating to the physical or chemical composition of the soil found in a particular area.
Use the diagram to answer the question that follows
The part labelled 1 is the ________
carpel
sepal
petal
stigma
Correct answer is D
The part labelled 1 is the stigma and the part labelled 2 is the ovary.
The host of liver fluke are ______?
pig and snail
pig and sheep
sheep and snail
pig
Correct answer is C
Liver fluke (Fasciola hepatica) is a parasite affecting a range of livestock and other species. Final hosts in which it can develop to sexual maturity include livestock such as sheep, cattle, horses, goats, alpacas and deer. People can be infected by eating water cress growing along creeks in fluke-infested country.
Carbon (iv) oxide is added to the atmosphere when ________?
plants build-up organic compounds
plants absorb mineral salts
sugars are completely broken down in animals
there is thunderstorm
Correct answer is C
No explanation has been provided for this answer.
The most efficient respiratory structure used by free living protozoan is ________
body surface
gills
buccal cavity
spiracle
Correct answer is A
Protozoa do not have any organellae for the process of respiration. The limiting permeable membrane (body surface) acts as a respiratory surface.
The free molecular oxy¬gen from the surrounding media enters into the body by diffusion. Presence of a cyto¬chrome system has been demonstrated in protozoa.