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 statements about viruses is true?
Viruses can reproduce outside of a host cell
Viruses require a host cell to replicate
Viruses possess a cellular structure
Viruses are living organisms
Correct answer is B
Viruses are considered parasitic because they require a host cell to replicate. They do this by injecting their genetic material into the host cell and using the cell's machinery to replicate.
Which of the following best describes a natural habitat in ecology?
An area where organisms naturally live and interact with their surroundings
A human-created environment for wildlife conservation
A controlled laboratory setting for ecological experiments
A protected area for endangered species
Correct answer is A
A natural habitat in ecology refers to an area where organisms naturally live and interact with their surroundings. A natural habitat encompasses the ecological conditions, physical features, and resources that support the survival and interactions of organisms within their natural environment. It includes factors such as climate, vegetation, soil composition, and other biotic and abiotic components.
Which of the following statements best describes pollination in plants?
Pollination is the process of transferring pollen from the stigma to the anther of a flower
Pollination is the process of transferring pollen from the anther to the stigma of a flower
Pollination is the process of releasing pollen into the air for dispersal
Pollination is the process of seed formation within a flower
Correct answer is B
Pollination in plants refers to the transfer of pollen from the anther (male reproductive organ) to the stigma (female reproductive organ) of a flower.
Which of the following best describes the concept of trophic levels in a functioning ecosystem?
The levels of ecological interactions within an ecosystem
The levels of energy flow within an ecosystem
The levels of nutrient cycling within an ecosystem
The levels of biological diversity within an ecosystem
Correct answer is B
The concept of trophic levels in a functioning ecosystem refers to the levels of energy flow within the ecosystem. Trophic levels represent the hierarchical structure of feeding relationships within an ecosystem, with each level representing a different position in the food chain.
Which of the following options correctly identifies excretory organs in animals?
Stomach, intestines, and bladder
Lungs, kidneys, and skin
Brain, spinal cord, and nerves
Heart, liver, and spleen
Correct answer is B
The correct identification of excretory organs in animals is lungs, kidneys, and skin.
Lungs play a vital role in excretion by eliminating carbon dioxide, a waste product of cellular respiration, through exhalation.
Kidneys are major excretory organs responsible for filtering blood and removing metabolic wastes, excess water, and dissolved solutes in the form of urine.
Skin, although primarily a protective organ, also participates in excretion. Sweating, through sweat glands in the skin, helps regulate body temperature and eliminates small amounts of metabolic waste such as urea and salts.