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 sequence of the one-way gaseous exchange mechanism in a fish is
mouth → operculum → gills
mouth → gills → operculum
operculum → gills → mouth
gills → operculum → mouth
Correct answer is B
Fish exchange gases by pulling oxygen-rich water through their mouths and pumping it over their gills. In some fish, capillary blood flows in the opposite direction to the water, causing counter-current exchange. The gills push the oxygen-poor water out through openings in the sides (opercula) of the pharynx.
II
I
IV
III
Correct answer is C
Stomata allow a plant to take in carbon dioxide, which is needed for photosynthesis. They also help to reduce water loss.
The alveoli are where the lungs and the blood exchange oxygen and carbon dioxide during the process of breathing in and breathing out.
The Malpighian tubules are tubular structures that are free floating in the haemolymph and function as excretory and osmoregulatory organs of insects.
Contractile vacuoles (in the cells of the lower organisms) protect a cell from absorbing too much water and potentially exploding by excreting excess water.
20%
25%
40%
60%
Correct answer is D
No explanation has been provided for this answer.
The order of passage of food in the digestive system is
ileum → caecum →large intestine → rectum
ileum → colon → caecum → rectum
large intestine → ileum → caecum → rectum
colon → caecum → ileum → rectum
Correct answer is A
No explanation has been provided for this answer.
Which of the following produces both hormones and enzymes?
Ileum
Pancreas
Gall bladder
Kidney
Correct answer is B
The pancreas has two main functions: an exocrine function that helps in digestion and an endocrine function that regulates blood sugar.