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  4. Organisms And Population Chapter-Wise Test 3

Organisms And Population Chapter-Wise Test 3

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which type of survivorship curve is typical for humans?

Type I (convex)
Type II (linear)
Type III (concave)
J-shaped
1

Humans exhibit a Type I survivorship curve, where mortality is low in early and middle life but increases in old age.

Which of the following interactions involves one species benefiting while the other remains unaffected?

Mutualism
Commensalism
Parasitism
Competition
2

Commensalism is a relationship where one species benefits while the other is neither harmed nor helped.

Which of the following factors is NOT directly involved in regulating population density?

Natality
Mortality
Mutation rate
Immigration
3

Mutation rate affects genetic variation but does not directly regulate population density like birth rate, death rate, and migration.

Which of the following statements about trophic levels is incorrect?

Producers occupy the first trophic level.
Primary consumers feed on producers.
Tertiary consumers obtain energy directly from producers.
Decomposers recycle nutrients back into the ecosystem.
3

Tertiary consumers do not feed directly on producers; they obtain energy from primary and secondary consumers.

What is the key characteristic of a stable population?

High birth and death rates
Declining growth rate
Balanced natality and mortality
Increasing age group of post-reproductive individuals
3

A stable population has balanced birth and death rates, leading to minimal overall population change.

Which of the following factors directly influences population dispersion?

Genetic drift
Availability of resources
Mutation rate
Chromosome number
2

Population dispersion is influenced by resource availability, determining whether individuals are clumped, uniform, or randomly distributed.

Which of the following species interactions benefits both species?

Mutualism
Parasitism
Commensalism
Amensalism
1

In mutualism, both species benefit from the interaction, such as pollinators and flowering plants.

Which of the following interactions involves one species being harmed while the other remains unaffected?

Mutualism
Parasitism
Amensalism
Commensalism
3

In amensalism, one species is negatively affected while the other is neither harmed nor benefited.

Which of the following is an example of cryptic coloration?

A vulture feeding on a carcass
A leaf insect resembling a leaf
A tiger hunting a deer
A mosquito sucking blood
2

Cryptic coloration allows an organism to blend into its environment, such as a leaf insect resembling a leaf.

Which of the following is an incorrect statement about primary productivity?

It refers to the rate of energy capture by autotrophs.
Net primary productivity accounts for energy lost during respiration.
Primary productivity is highest in deep ocean zones.
Gross primary productivity is the total energy captured by producers.
3

Primary productivity is highest in areas with ample sunlight and nutrients, such as tropical rainforests and shallow ocean waters, not deep ocean zones.

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