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 practices may lead to an infection of the eye? Using
contact lenses
convex lenses
biconcave lenses
concave lenses
Correct answer is A
Contact lenses have a way of causing infections to the eyes at some point. It can cause a lack of oxygen since they are worn directly on the eye, especially if worn for long periods at a time.
Which of the following statements about the response of neurons to stimulus is correct?
Neurons respond to stimulus of any strength
Neurons respond to all stimuli applied in rapid succession
Neurons respond more rapidly during the absolute refraction period
Intensity of stimulus must reach a threshold value before the neurons can be excited
Correct answer is D
Each neuron has a threshold that must be met before an action potential travels the length of the neurons axon. In other words, the neurons don't just begin to act immediately, there is a threshold value where the intensity of the stimulus must get to in order to yield a response from the neuron. This is why you can consciously pinch your self and not feel anything serious but when it is unconscious, it gives you serious pain.
The thyroid gland is found at the base of the
Midbrain
Kidney
Neck
Liver
Correct answer is C
The thyroid gland is an endocrine gland located at the base of the neck.
Ultrafiltration in the kidney takes place in the
Renal vein
Medulla
Loop of Henle
Bowman's Capsule
Correct answer is D
The fine structure of the glomerulus and Bowman’s capsule facilitate ultrafiltration. It is the non-specific filtration of the blood under high pressure and occurs in the Bowman’s capsule of the nephron.
An example of homeostasis in living organisms is
cooling effect resulting from evaporation of water from the body surface
root hairs of a plant growing towards the source of light
changing of the body colour of chameleon to match the colour of the foliage on which it is resting
the release of phosphorus into the phloem of a plant growing in a phosphorus-deficient soil
Correct answer is D
Homeostasis is a living organism's way of maintaining a stable internal environment even in the event of external environmental changes. When the plant keeps supplying phosphorus to the phloem even in the case of a deficiency in the soil, it maintains a steady balance on its inside irrespective of the lack in the soil.