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 damage to ozone layer is caused by
Oxygen
Nitrogen oxide
Chlorofluorocarbons
sulphur dioxide
Correct answer is C
Ozone sits in the upper atmosphere and absorbs ultraviolet radiaton, another type of solar energy that's harmful to humans, animals, and plants. CFCs and halons cause chemical reactions that break down ozone molecules, reducing ozone's ultraviolet radiation-absorbing capacity
Chlorofluorocarbons (CFCs) and other halogenated ozone depleting substances (ODS) are mainly responsible for man-made chemical ozone depletion.
The following are involved in reflex action EXCEPT
brain cells
intermediate neuron
motor neuron
receptor
sensory neuron
Correct answer is A
No explanation has been provided for this answer.
Name the blood cells in which nucleus is absent
Lymphocytes
Blood Platelets
Monocytes
Eosinophil
Correct answer is B
Like red cells, platelets (thrombocytes) have no nucleus. However, unlike red cells that originate in the marrow as nucleated cells and lose their nucleus, platelets are produced by budding off from a giant multinucleated marrow cell called a megakaryocyte.
Phytology
Phycology
Pedology
Plantophyta
Correct answer is A
Phytology is the branch of biology that studies plants.
Etiolation is caused by the influence of
Mineral Salts
Water
Carbondioxide
Light
Correct answer is D
Etiolation is a process in flowering plants grown in the partial or complete absence of light. It is characterized by long, weak stems; smaller leaves due to longer internodes; and a pale yellow color.