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 is an example of discontinuous variation?
the range in height of a pea plant from 30cm to 50cm
Offspring, including the two male cats and three female cats
the colour of pear plants grown in the dark
the adult body weight ranging from 50 kg to 95 kg
Correct answer is B
A characteristic of any species with only a limited number of possible values shows discontinuous variation (i.e It can only be a discrete number of values). Human blood group is an example of discontinuous variation. In the ABO blood group system, only four blood groups are possible (A, B, AB or O). There are no values in between, so this is discontinuous variation.
Here are some examples: blood group, sex (male or female), eye color, etc.
Legumes incorporate nitrogen gas into their proteins because
of the presence of Azotobacter in their roots
they possess root nodules containing Rhizobium
they have a well developed root system
they are autotrophic
Correct answer is B
No explanation has been provided for this answer.
Forest conservation includes the following except
preventing bushfires
extensive tree felling
replacing harvested trees by planting seedlings
selective exploitation of forest trees
Correct answer is B
No explanation has been provided for this answer.
Renewable resources are formed by
animals that reproduce sexually
organisms confined to forest reserves
organisms that are constantly regenerating themselves
plants and animals that can reproduce sexually
Correct answer is C
No explanation has been provided for this answer.
Viruses are agents of the following diseases except
measles
smallpox
poliomyelitis
tuberculosis
Correct answer is D
No explanation has been provided for this answer.