Organisms and Population Chapter-Wise Test 22

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following is NOT a population attribute?

Age distribution
Sex ratio
Body mass
Population density
3

Body mass is a characteristic of an individual, while population attributes include age distribution, sex ratio, and density.

Which of the following is an incorrect statement about biodiversity?

Higher biodiversity increases ecosystem resilience.
Biodiversity loss can disrupt ecosystem functions.
All ecosystems have the same level of biodiversity.
Tropical rainforests have higher biodiversity than deserts.
3

Different ecosystems have varying levels of biodiversity, with tropical rainforests having the highest species diversity.

What does an age pyramid with a broad base indicate?

A stable population
A declining population
A rapidly growing population
An aging population
3

A broad base in an age pyramid indicates a high birth rate and a rapidly growing population.

Which of the following factors influences carrying capacity (K) in an ecosystem?

Food availability
Climate conditions
Predation pressure
All of the above
4

Carrying capacity is determined by multiple factors, including food availability, climate, and predation pressure.

Which of the following describes character displacement?

Two species developing similar traits
A species evolving traits to reduce competition
A predator evolving to better hunt prey
Two species merging into one
2

Character displacement occurs when species evolve different traits to minimize competition when they coexist.

What is the main characteristic of a K-selected species?

High reproductive rate
Low parental care
Slow growth and stable population size
Short lifespan
3

K-selected species have slow growth, invest in parental care, and maintain stable population sizes.

Which of the following is a major difference between primary and secondary succession?

Secondary succession occurs in an area without any life
Primary succession takes longer because soil formation is required
Primary succession occurs after a natural disaster
Secondary succession begins with lichens and mosses
2

Primary succession is slower because it starts on bare surfaces, requiring soil formation before larger plants can establish.

Which of the following is a correct statement about invasive species?

They always increase ecosystem biodiversity.
They often outcompete native species for resources.
They only exist in aquatic environments.
They do not affect ecosystem dynamics.
2

Invasive species can outcompete native species, reducing biodiversity and altering ecosystem balance.

Which of the following describes K-selected species?

Short lifespan and high reproductive rate
Small body size and rapid growth
Few offspring with high parental care
Early reproduction and large numbers of offspring
3

K-selected species produce fewer offspring and invest significant parental care to ensure survival.

Which of the following describes a realized niche?

The full range of environmental conditions a species can utilize
The actual conditions in which a species exists due to competition
A species’ reproductive rate
The total number of species in an ecosystem
2

A realized niche refers to the actual space and resources a species utilizes after accounting for competition.

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