2019 - JAMB Biology Past Questions and Answers - page 3

A population is the total number of organisms of the same species living together in a given area at a particular time.

Population frequency refers to the number of times an organism occurs within a given area of a habitat

Voluntary action is an action that is thought of and consciously performed by the person

The nucleus of living cells contains the genetic material that determines the entire structure and function of that cell. Inside the nucleus lies the blueprint that dictates everything a cell will do and all of the products it will make. This information is stored within DNA.

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Glomerular filtrate contains H\(_2\)O, glucose, salts and urea and it is identical to blood plasma that lacks most proteins.

Organic evolution The process by which changes in the genetic composition of populations of organisms occur in response to environmental changes. See adaptation; evolution. Compare biochemical evolution

An ecological niche is the role and position a species has in its environment; how it meets its needs for food and shelter, how it survives, and how it reproduces. A species' niche includes all of its interactions with the biotic and abiotic factors of its environment

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In the natural environment, plants produce their own food to survive. As with photosynthesis, plants get oxygen from the air through the stomata. Respiration takes place in the mitochondria of the cell in the presence of oxygen, which is called "aerobic respiration

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Discontinuous variation is the differences of variations in behaviour in organisms by which the organisms can be grouped into two or more classes within a population without any intermediates among them; examples: behaviour, ability to roll tongue.

Clay soil has the highest water retaining capacity.