Organisms and Population Chapter-Wise Test 14

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about trophic cascades is correct?

They only occur in aquatic ecosystems.
They describe how changes in predator populations affect lower trophic levels.
They do not influence ecosystem stability.
They only involve herbivores and primary producers.
2

Trophic cascades describe the effects of predator population changes on lower trophic levels, influencing ecosystem balance.

Which of the following is NOT an adaptation of prey to avoid predators?

Camouflage
Poison production
Bright warning coloration
Increased reproduction rate
4

Increased reproduction rate helps populations survive but does not directly protect individual prey from predators.

Which of the following statements about habitat destruction is correct?

Habitat destruction increases species diversity.
It has no impact on ecosystem stability.
It is a major cause of biodiversity loss.
It primarily affects only large mammals.
3

Habitat destruction is a leading cause of biodiversity loss, as it reduces available resources and disrupts ecosystems.

Which of the following is a likely consequence of habitat fragmentation?

Increased biodiversity
Increased genetic variation
Increased edge effects and isolation of populations
Increased resource availability
3

Habitat fragmentation leads to isolation of populations and increased edge effects, which can negatively impact species survival.

Which of the following statements about ecological pyramids is correct?

Pyramids of biomass and energy are always upright.
Pyramid of numbers is always inverted.
Energy is lost at each trophic level in an ecological pyramid.
A pyramid of energy can sometimes be inverted.
3

Energy is lost at each trophic level due to metabolic activities and heat dissipation.

Which of the following correctly describes a climax community?

A temporary community that develops during succession
A stable and self-sustaining community
A community that constantly changes with seasons
A community with low biodiversity
2

A climax community is a stable and mature ecological state reached at the end of succession.

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

Keystone species play a critical role in ecosystem stability.
Their removal can lead to drastic changes in an ecosystem.
Keystone species are always the most abundant species in an ecosystem.
Predators can act as keystone species by controlling prey populations.
3

Keystone species are not necessarily the most abundant, but they have a disproportionately large impact on ecosystem structure.

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

They always increase biodiversity.
They can disrupt ecosystem stability by outcompeting native species.
They always require human introduction.
They have no effect on native species.
2

Invasive species often outcompete native species, reducing biodiversity and altering ecosystem dynamics.

Which type of species interaction is most important for pollination?

Predation
Mutualism
Amensalism
Parasitism
2

Mutualism benefits both species, such as pollinators receiving nectar while aiding plant reproduction.

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.

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