2019 - JAMB Biology Past Questions and Answers - page 3
A population is best described as
A group of the same species of organisms living together
A group of animals and plants living together
A group of insects and grasses
Different species of wild animals
A population is the total number of organisms of the same species living together in a given area at a particular time.
The number of times an organism occurs within a given area of a habitat is referred to as
Population frequency refers to the number of times an organism occurs within a given area of a habitat
Reading the verdict of a case by a magistrate is an example of
A reflex action
An instinct
A conditioned reflex
A voluntary action
Voluntary action is an action that is thought of and consciously performed by the person
Which of the following structures controls the activities of the living cell?
Nucleus
Centrosome
Mitochondrion
Golgi body
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.
Which of the following are components of glomerular filtrate?
Glomerular filtrate contains H\(_2\)O, glucose, salts and urea and it is identical to blood plasma that lacks most proteins.
The sum total of adaptive changes from pre-existing form that have taken place over a long time resulting in diversity of forms, structures and functions among organism is referred to as
Specification
Inorganic Evolution
Evolution
Organic Evolution
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
The specific portion of a habitat which is occupied by a particular species is referred to as
Ecological population
Ecological niche
Biotic community
Ecosystem
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
In plants, respiration occurs in
The stomata and lenticel only
Mesophyll cells only
All living cells
The root only
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
Which of the following is an example of discontinous variatio?
The range in height of a pea plant from 30cm to 50cm
Offsprings including two male cats and three female cats
The colour of pear plants grown in the dark
The adult body weight ranging from 50kg to 95kg
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.
Which of the following type of soil has the highest water retaining capacity?
Loam
Laterite
Clay
Sand