Organisms And Population Chapter-Wise Test 1

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about keystone species is correct?

Keystone species have little impact on ecosystem stability.
Removing a keystone species can lead to ecosystem collapse.
Keystone species are always the most abundant species.
Keystone species only exist in aquatic ecosystems.
2

Keystone species play a crucial role in ecosystem structure, and their removal can have cascading effects on the ecosystem.

Which of the following is a correct statement about ecological resilience?

Resilience refers to an ecosystem's ability to recover from disturbances.
Resilient ecosystems are always fragile.
Ecosystem resilience is unaffected by biodiversity.
Resilience decreases when species interactions are strong.
1

Ecological resilience refers to an ecosystem's ability to recover from disturbances and maintain its functions.

Which of the following factors can increase the genetic diversity of a population?

Genetic drift
Mutation
Bottleneck effect
Founder effect
2

Mutations introduce new genetic variations, increasing the genetic diversity of a population.

Which of the following statements about energy flow in ecosystems is correct?

Energy is continuously recycled within an ecosystem.
Only 10% of energy is transferred from one trophic level to the next.
Producers have the lowest energy availability.
Energy transfer between trophic levels is 100% efficient.
2

Only about 10% of energy is passed from one trophic level to the next, with most energy lost as heat.

Which of the following statements about logistic growth is TRUE?

It occurs only in laboratory conditions
Population growth slows as it nears carrying capacity
There is no competition for resources
Population size increases indefinitely
2

Logistic growth slows as a population nears carrying capacity due to increased competition and limited resources.

Which of the following is an example of density-dependent regulation in a population?

Earthquake
Food availability
Flood
Climate change
2

Food availability is a density-dependent factor because it becomes limited as population size increases.

Which of the following statements about biogeochemical cycles is correct?

The carbon cycle is driven by photosynthesis and respiration.
The nitrogen cycle does not involve bacteria.
The water cycle does not include transpiration.
Nutrient cycles do not influence ecosystem stability.
1

Photosynthesis removes carbon dioxide from the atmosphere, while respiration releases it back, driving the carbon cycle.

Which type of selection favors individuals with traits that help them avoid predation?

Directional selection
Disruptive selection
Stabilizing selection
Artificial selection
1

Directional selection favors traits that improve survival, such as camouflage, which helps organisms avoid predation.

Which of the following is a characteristic of K-selected species?

Short lifespan
Large body size and few offspring
No parental care
Rapid reproduction
2

K-selected species produce fewer offspring, invest in parental care, and have longer lifespans.

Which of the following correctly defines ecological niche?

The habitat of an organism
The role and interactions of an organism within an ecosystem
The trophic level of an organism
The geographical distribution of a species
2

An ecological niche refers to an organism’s functional role, interactions, and resource utilization in an ecosystem.

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