Organisms and Population Chapter-Wise Test 8

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following is an example of secondary succession?

Colonization of a newly formed volcanic island
Growth of plants in an abandoned farmland
Development of life on a glacier
Formation of a coral reef
2

Secondary succession occurs in areas where life existed before, such as abandoned farmland.

Which of the following statements about the nitrogen cycle is correct?

Nitrogen fixation converts nitrogen gas into a usable form for plants.
Denitrification increases soil nitrogen levels.
Plants can absorb nitrogen directly from the atmosphere.
The nitrogen cycle does not involve bacteria.
1

Nitrogen fixation by bacteria converts atmospheric nitrogen into ammonia, which can be used by plants.

Which of the following is an incorrect statement about population ecology?

Population size is influenced by birth and death rates.
Immigration increases population size.
Carrying capacity can change due to environmental factors.
Population growth is never affected by resource availability.
4

Resource availability affects population growth, as limited resources lead to competition and population regulation.

Which of the following statements about population dispersion patterns is correct?

Clumped dispersion occurs when resources are evenly distributed.
Random dispersion is the most common pattern in nature.
Uniform dispersion is often due to competition among individuals.
Dispersion patterns do not affect population interactions.
3

Uniform dispersion occurs when individuals compete for limited resources, leading to evenly spaced distribution.

Which of the following is a common strategy used by prey to avoid predation?

Camouflage
Producing large numbers of offspring
Hibernation
Symbiosis
1

Camouflage helps prey blend into their surroundings, making it harder for predators to detect them.

Which species interaction is similar to parasitism but does NOT result in the immediate death of the host?

Predation
Commensalism
Amensalism
Parasitism
4

Parasitism, like predation, benefits one species while harming the other, but it does not cause immediate death of the host.

Which of the following statements about biogeochemical cycles is correct?

Nitrogen fixation converts nitrogen gas into ammonia.
Denitrification increases soil nitrogen levels.
The phosphorus cycle includes an atmospheric component.
The carbon cycle does not involve respiration.
1

Nitrogen fixation by bacteria converts atmospheric nitrogen (N₂) into ammonia (NH₃), making it available for plant uptake.

What is the role of pioneer species in ecological succession?

They are the final stage in succession
They prepare the habitat for other species
They are always trees
They cause habitat destruction
2

Pioneer species colonize barren environments and modify them, enabling other species to establish.

Which factor is most likely to cause a population bottleneck?

Genetic drift
Overhunting
Mutation
Stable environment
2

Overhunting or natural disasters can drastically reduce population size, leading to a bottleneck effect and loss of genetic diversity.

Which of the following population characteristics is most useful for predicting future population growth?

Carrying capacity
Age structure
Body size
Food preferences
2

Age structure helps predict future population growth by showing the proportion of individuals in reproductive and pre-reproductive stages.

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