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 diagrams below are illustrations of forms in which a particular group of organisms exist. Study them and answer the question.
in which of the illustrated forms does the organism that causes cholera exist?
III
II
IV
V
Correct answer is D
V.
Vibrio: These are comma-shaped bacteria. They are curved rods and are often found in aquatic environments. Vibrio cholerae is an example, responsible for causing cholera.
The diagrams below are illustrations of forms in which a particular group of organisms exist. Study them and answer the question.
Which group of organisms is illustrated?
protozoa
viruses
fungi
bacteria
Correct answer is D
No explanation has been provided for this answer.
The food substance that would produce the highest amount of energy is
protein
amino acid
fat
glucose
Correct answer is C
The food substance that would produce the highest amount of energy is fat.
Fat is the most energy-dense macronutrient, providing 9 calories per gram. On the other hand, both carbohydrates (including glucose) and proteins provide 4 calories per gram. While amino acids are the building blocks of proteins, they are not a direct source of energy like fat and carbohydrates.
Which of the following activities is against the conservation of natural resources?
Contour ploughing
afforestation
establishment of game reserves
deforestation
Correct answer is C
Deforestation: Deforestation is the opposite of afforestation. It involves the clearing or removal of forests or trees from an area. Deforestation leads to the loss of valuable natural resources like timber, biodiversity, soil fertility, and water regulation. It disrupts ecosystems, accelerates soil erosion, and releases stored carbon dioxide, contributing to climate change. Deforestation is detrimental to the conservation of natural resources and has serious environmental consequences.
Organisms that feed on dead, decaying tissues of other organisms are known as
saprophytes
autotrophs
parasites
heterotrophs
Correct answer is A
Organisms that feed on dead, decaying tissues of other organisms are known as "saprophytes." Saprophytes, also known as saprotrophs or decomposers, are organisms that obtain their nutrition by feeding on dead, decaying organic matter (detritus) from other organisms.
The ability of organisms to maintain a constant internal environment is known as
diuresis
plasmolysis
endosmosis
homeostasis
Correct answer is D
The ability of organisms to maintain a constant internal environment is known as "homeostasis." Homeostasis is a fundamental biological concept that refers to the ability of living organisms to maintain a stable and relatively constant internal environment despite changes in the external environment.
The type of nutrition in which organisms take solid organic materials into their body is
parasitic
holozoic
saprophytic
symbiotic
Correct answer is B
Holozoic nutrition is a type of nutrition in which organisms consume solid organic materials. This is the type of nutrition seen in most animals, where food is ingested and then broken down through digestion. This is different from symbiotic (where two organisms live together and benefit from each other), saprophytic (where organisms feed on dead and decaying matter), and parasitic (where one organism benefits at the expense of another) nutrition.
Eardrum
Ossicles
Cochlea
Auditory canal
Correct answer is C
The cochlea is a spiral-shaped structure in the inner ear that is filled with fluid and lined with cells with very fine hairs. These hairs move when the fluid in the cochlea moves, thereby converting sound vibrations into nerve signals that the brain can interpret. Therefore, the correct answer is 'Cochlea.' The eardrum and ossicles help to transmit sound vibrations to the cochlea, but it is the cochlea that transmits these vibrations as signals to the auditory nerve.
Which of the following is a difference between plant and animal cells?
Plant cells have a nucleus, while animal cells do not
Plant cells have a cell membrane, while animal cells have a cell wall
Plant cells contain chloroplasts for photosynthesis, while animal cells do not
Plant cells have a central vacuole, while animal cells have multiple small vacuoles
Correct answer is C
One of the main differences between plant and animal cells is that plant cells contain chloroplasts for photosynthesis, while animal cells do not. However, plant cells contain chloroplasts, which are organelles responsible for photosynthesis, enabling plants to convert sunlight into energy-rich molecules. Animal cells lack chloroplasts and obtain energy through other means, such as consuming organic matter.
Digestive enzymes are responsible for
Breaking down food into smaller molecules
Absorbing nutrients into the bloodstream
Regulating the pH of the digestive tract
Transporting food through the digestive system
Correct answer is A
Digestive enzymes play a vital role in the process of digestion by breaking down food into smaller molecules that can be easily absorbed and utilized by the body. Digestive enzymes are produced by various organs in the digestive system, including the salivary glands, stomach, pancreas, and small intestine.
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