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.
The dorsal and anal fins of fish are used for
Upward movement
Controlling rolling
Downward movement
Steering
Buoyancy
Correct answer is B
No explanation has been provided for this answer.
Which of the following statement is NOT true of enzymes? They
Are proteins
Need cofactors to activate them
Are sensitive in their action
Are specific in their action
Can withstand high temperature
Correct answer is E
No explanation has been provided for this answer.
Osmosis can be defined as the movement of
Molecules from solution of higher concentration to low concentration
Molecules from solution of low concentration to high concentration
Water from solution of high concentration to low concentration
Water across a semi-permeable membrane from solution of low concentration to high concentration
Water across a semi-permeable membrane from solution of high concentration to low concentration
Correct answer is D
Osmosis is a special case of diffusion in which only water molecules move from a region of higher to lower water potential through a semi-permeable membrane.
The exchange of genes between homologous chromosomes is called
test cross
back cross
crossing-over
mutation
Correct answer is C
No explanation has been provided for this answer.
The mammalian organ through which nourishment and oxygen diffuse into a developing embryo is called
Amnion
Chorion
Umbilical cord
Oviduct
Placenta
Correct answer is E
No explanation has been provided for this answer.