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.
In the mammalian respiratory system. exchange of gases occurs in the
lungs
bronchi
bronchioles
alveoli
Correct answer is D
The alveoli are where the lungs and the blood exchange oxygen and carbon dioxide during the process of breathing in and breathing out.
prevent algal growth in culture solution
allow root growth
prevent breakdown of mineral elements
prevents photosynthesis in the root
Correct answer is A
Always use a completely opaque water storage tank - Algae uses photosynthesis to reproduce.
When the original king and queen of termites die, they are replaced by
the king and queen of another colony
some adult reproductives from the same colony
some adult workers which are specially fed to breed
developing nymphs nurtured as secondary reproductives
Correct answer is D
When the queen dies, production of the blocking pheromone stops, and secondary reproductives may be produced.
In the Reticulitermes species, the queen and king may be replaced by numerous secondary reproductives, and the colony may become very large with the added productivity of many queens.
46.7
25.0
20.0
30.0
Correct answer is D
Percentage of water content (retained) = \(\frac{Water absorbed}{Weight of soil} * 100\)
→ \(\frac{50 - 35}{50} * 100\)
= 30%
Which of the following is NOT regarded as a pollutant on land or in air?
Smoke
Nitrogen
Noise
Sulphur dioxide
Correct answer is B
Air Pollutants
The primary pollutants of concern in land and soil are heavy metals, such as lead, mercury and others, pesticides and other persistent organic pollutants, and pharmaceuticals, such as antibiotics used for livestock management.
Nitrogen (N), nonmetallic element of Group 15 [Va] of the periodic table.
It is a colourless, odourless, tasteless gas that is the most plentiful element in Earth's atmosphere and is a constituent of all living matter.