30 key definitions in Biology for WASSCE Candidates

Here are 30 key definitions in Biology.

1. Cell: The basic unit of life, consisting of a membrane-bound structure containing genetic material and other components.
2. DNA: Deoxyribonucleic acid, a molecule that carries genetic information.
3. Gene: A unit of heredity that determines a trait.
4. Chromosome: A structure consisting of DNA and associated proteins that carries genetic information.
5. Protein: A large, complex molecule composed of amino acids that performs a variety of functions in the body.
6. Enzyme: A protein that catalyzes chemical reactions in the body.
7. Metabolism: The set of chemical reactions that occur in living organisms to maintain life.
8. Photosynthesis: The process by which plants convert sunlight, carbon dioxide, and water into glucose and oxygen.
9. Respiration: The process by which organisms break down glucose to release energy.
10. Evolution: The process by which species change over time through natural selection.
11. Adaptation: A characteristic that helps an organism survive and reproduce in its environment.
12. Species: A group of organisms that can interbreed to produce fertile offspring.
13. Ecosystem: A community of living organisms and their physical environment.
14. Biodiversity: The variety of life in an ecosystem.
15. Food chain: A sequence of organisms in an ecosystem in which each organism is the food of the next.
16. Trophic level: A level in a food chain or web defined by an organism’s position in the chain and its source of energy.
17. Biome: A large, geographic area with a specific climate, vegetation, and animal life.
18. Endangered species: A species at risk of extinction due to a low population size or habitat loss.
19. Mutation: A change in DNA sequence that can lead to genetic variation.
20. Genetic drift: A random change in gene frequency in a population over time.

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1. Natural selection: The process by which organisms with advantageous traits are more likely to survive and reproduce.
2. Adaptation: A characteristic that helps an organism survive and reproduce in its environment.
3. Homeostasis: The maintenance of a stable internal environment in an organism.
4. Hormone: A chemical messenger produced by the endocrine system that regulates bodily functions.
5. Immune system: The body’s defense system against infectious agents.
6. Neuron: A specialized cell that transmits electrical signals in the nervous system.
7. Synapse: The junction between two neurons where chemical signals are transmitted.
8. Action potential: An electrical signal that travels along a neuron.
9. Neurotransmitter: A chemical substance that transmits signals between neurons.
10. Central nervous system: The brain and spinal cord, which are responsible for processing and coordinating information in the body.

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We hope these 30 key definitions in Biology for WASSCE Candidates will help you prepare for the impending examination.