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.
Rhizopus (or mucor)obtain its food from dead organic matter extracellularly. It is said to be
a facultative parasite
saprophyte
an obligate parasite
a commensal
an autotroph
Correct answer is B
A saprophyte or saprotroph is an organism which gets its energy from dead and decaying organic matter. This may be decaying pieces of plants or animals.
Which of these is not true of the insect? The possession of
two pairs of antennae
jointed appendages
exoskeleton
three pairs of legs
segmented body
Correct answer is A
Insects possess one pair of antenna and not two pairs.
The neck region of the tape worm, (taenia) is responsible for the
production of egg
storage of egg
formation of new segment
development of the suckers
fragmentaion of the body segment
Correct answer is C
The adult tapeworm possesses a series of flat, rectangular body segments, or proglottids, generated by the neck.
one chromosome from the male joins another from the female
one gene from the male combines with another from the female
the male nucleus fuses with the female nucleus
one set of chromosome combines with another set from the female
one cell from the male fuses with another from the female
Correct answer is C
Fertilization is the union of a spermatozoal nucleus, of paternal origin, with an egg nucleus, of maternal origin, to form the primary nucleus of an embryo.
the shoot absorbed 1g of water per hour
1g of water per hour evaporates from the potometer
the shoot lost 1g of water per hour
the potometer water receded at the rate of 1g per hour
the shoot was respiring and lost weight at rate of 1g per hour
Correct answer is C
The amount of water lost is (18.9 - 17.9)g = 1g. Hence, the water lost by the shoot is 1g.