Online Test — Organisms and Populations
15 Questions • 15 min • Chapter MCQ
15:00
Question 1 of 15
The study of organisms and their interactions with the environment is:
Ecology
Genetics
Anatomy
Cytology
Explanation: Ecology studies organisms and their environment.
Question 2 of 15
The place where an organism lives is its:
Habitat
Niche only
Population
Tissue
Explanation: The habitat is where an organism lives.
Question 3 of 15
Temperature, light and soil are ____ factors.
Biotic
Abiotic
Living
Animal
Explanation: These non-living factors are abiotic.
Question 4 of 15
Spines and a thick waxy stem in a cactus help it to:
Reduce water loss
Catch insects
Float
Make sound
Explanation: These adaptations reduce water loss in the desert.
Question 5 of 15
Winter sleep by which some animals escape the cold is:
Aestivation
Hibernation
Migration only
Predation
Explanation: Hibernation is winter dormancy.
Question 6 of 15
A group of organisms of the same species in an area is a:
Population
Community
Habitat
Niche
Explanation: A population is one species in an area.
Question 7 of 15
The number of individuals per unit area is the:
Sex ratio
Population density
Age
Habitat
Explanation: Population density is individuals per unit area.
Question 8 of 15
The proportion of young, adult and old individuals is the:
Age structure
Density
Birth rate
Sex ratio
Explanation: Age structure shows the proportion of different ages.
Question 9 of 15
Unlimited resources produce a ____ growth curve.
J-shaped (exponential)
Flat
Circular
Negative
Explanation: Exponential growth gives a J-shaped curve.
Question 10 of 15
The maximum population an environment can support is its:
Carrying capacity (K)
Sex ratio
Density only
Habitat
Explanation: Carrying capacity (K) is the environmental limit.
Question 11 of 15
A more realistic, S-shaped population curve is called:
Logistic (sigmoid)
Exponential
Linear
Random
Explanation: Limited resources give the logistic (S-shaped) curve.
Question 12 of 15
A lion eating a deer is an example of:
Predation
Mutualism
Commensalism
Competition
Explanation: A predator killing and eating prey is predation.
Question 13 of 15
Two plants struggling for the same sunlight show:
Competition
Mutualism
Parasitism
Commensalism
Explanation: Struggle for the same resource is competition.
Question 14 of 15
Bees and flowers, where both benefit, show:
Mutualism
Predation
Parasitism
Competition
Explanation: Both benefit, so it is mutualism.
Question 15 of 15
An orchid growing on a tree for support (tree unaffected) is:
Commensalism
Parasitism
Predation
Mutualism
Explanation: One benefits, the other is unaffected — commensalism.