Organisms and Population Chapter-Wise Test 16

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about ecological succession is correct?

Primary succession occurs on previously uninhabited surfaces.
Secondary succession does not require soil for plant growth.
Pioneer species appear at the climax stage of succession.
Succession is a rapid process that completes within a few months.
1

Primary succession begins on newly formed or exposed surfaces, such as volcanic rock, where no previous life existed.

Which statement best describes the logistic growth model?

Population growth continues indefinitely
Growth rate increases exponentially without limits
Growth slows as the population nears carrying capacity
Birth rates increase as resources decrease
3

Logistic growth occurs when population growth slows as it reaches carrying capacity due to resource limitations.

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

Ecosystem resilience refers to the ability to recover from disturbances.
Resilience decreases with higher biodiversity.
Resilient ecosystems are always unstable.
Ecosystems with low biodiversity are more resilient to changes.
1

Ecological resilience is the ability of an ecosystem to withstand and recover from disturbances while maintaining its functions.

Which of the following is a biotic factor affecting population size?

Temperature
Predation
Water availability
Soil pH
2

Predation is a biotic factor as it involves interactions between living organisms, influencing population size.

Which of the following statements about food chains is correct?

Energy flow in a food chain is bidirectional.
Primary consumers directly feed on producers.
Decomposers occupy the second trophic level.
Food chains do not involve energy transfer.
2

Primary consumers, such as herbivores, obtain energy by feeding on producers like plants and algae.

Which of the following organisms follows an r-selected reproductive strategy?

Elephants
Humans
Rats
Whales
3

Rats exhibit an r-selected strategy, characterized by high reproductive rates, small body size, and minimal parental care.

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

Energy flows in a circular manner within an ecosystem.
Energy is recycled completely at each trophic level.
Only 10% of energy is transferred from one trophic level to the next.
Primary consumers have the highest energy availability.
3

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

Which of the following is an incorrect statement about keystone species?

Keystone species have a significant impact on ecosystem stability.
Their removal can cause disruptions in the ecosystem.
Keystone species are always the most abundant in an ecosystem.
Some predators act as keystone species by controlling prey populations.
3

Keystone species are not necessarily the most abundant but play a crucial role in maintaining ecosystem structure.

Which of the following statements about energy flow in an ecosystem is incorrect?

Energy flows in one direction from producers to consumers.
Decomposers recycle nutrients but do not transfer energy.
Energy transfer between trophic levels is 100% efficient.
Producers capture solar energy and convert it into chemical energy.
3

Energy transfer is not 100% efficient; only about 10% of energy is passed from one trophic level to the next.

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

Energy is recycled within an ecosystem.
Only 10% of energy is transferred between trophic levels.
Primary consumers have the highest energy availability.
Energy transfer between trophic levels is 100% efficient.
2

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

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