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.
An organism with identical allelic genes is described as
dihybrid
heterozygous
homozygous
monohybrid
recessive
Correct answer is C
No explanation has been provided for this answer.
Accessory material in a chicken egg include the following except
Albumen
Shell membrane
Shell
Germinal disc
Correct answer is D
The germinal disk (blastoderm)-- a small, circular, white spot (2-3 mm across) on the surface of the yolk-- is where the sperm enters the egg. The nucleus of the egg is in the blastodisc. The embryo develops from this disk, and gradually sends blood vessels into the yolk to use it for nutrition as the embryo develops.
A small mass of active protoplasm found directly under the vitelline membrane.
ln mammals, fertilization takes place in the
ovary
oviduct
uterus
vagina
vulva
Correct answer is B
No explanation has been provided for this answer.
The greatest amount of energy would be obtained by the oxidation of 100kg of
Meat
Butter
Sugar
Biscuit
Correct answer is B
Butter is about 80% fat, and the rest is mostly water and each gram of fat provides twice as much energy as carbohydrates or proteins. It is very high in saturated (about 70%) fatty acids, and contains a fair amount of monounsaturated fatty acids (about 25%).
The most abundant chemical in meat is water, followed by protein, then fat. Carbohydrates, minerals, and vitamins occur in much smaller amounts but, nevertheless, are very important metabolically and nutritionally.
In the egg of a bird, the embryo is located in the
Chalaza
Yolk
Albumen
Airspace
Correct answer is B
Special temporary organs or embryonic membranes form within the egg, both to protect the embryo and to provide for its nutrition, respiration, and excretion. These organs include the yolk sac.
The yolk sac is also responsible for the initial circulation and is in charge of delivering nutrients, via a primitive aorta, to the developing embryo through a process called vitelline circulation.