Organisms and Population
Test 6

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following factors is NOT involved in regulating population size?

Natality
Mortality
Immigration
Adaptation
4

Adaptation is an evolutionary process rather than a direct factor in regulating population size, unlike natality, mortality, and migration.

Which method is commonly used for estimating tiger population in India?

Direct headcount
Pugmark and fecal pellet analysis
Quadrat sampling
Mark-recapture method
2

Tiger populations are estimated using indirect methods such as pugmark and fecal pellet analysis to avoid disturbing the animals.

Which of the following is an example of interference competition?

Plants competing for sunlight
Lions and leopards fighting over a kill
Two species of birds feeding on the same seeds
Fish competing for dissolved oxygen
2

Interference competition occurs when organisms directly interact and obstruct access to resources, such as lions and leopards fighting over a kill.

Which of the following statements about primary succession is correct?

It occurs in areas where no life previously existed.
It happens after a forest fire.
It begins with the establishment of large trees.
It leads to the immediate formation of a climax community.
1

Primary succession occurs in lifeless areas, such as newly formed volcanic islands, where no life previously existed.

Which of the following statements about the logistic growth model is incorrect?

It accounts for environmental resistance.
It follows an S-shaped curve.
It assumes unlimited resources.
Growth rate decreases as population size approaches carrying capacity.
3

The logistic growth model does not assume unlimited resources; instead, it includes carrying capacity, which limits population growth.

Which of the following is a correct statement about food webs?

They represent a single pathway of energy flow.
They show multiple interconnected food chains.
They consist only of herbivores and carnivores.
They do not include decomposers.
2

Food webs depict multiple interconnected food chains, showing complex feeding relationships within an ecosystem.

Which of the following statements about mutualism is incorrect?

Both species benefit from the relationship.
It is an example of a symbiotic interaction.
One species benefits while the other is harmed.
Pollination by bees is an example of mutualism.
3

In mutualism, both species benefit from the interaction, unlike parasitism, where one species is harmed.

Which of the following is an example of an invasive species?

Banyan tree
Eucalyptus
Parthenium (Carrot grass)
Peepal tree
3

Parthenium (Carrot grass) is an invasive species that spreads rapidly and disrupts native ecosystems.

Which species interaction benefits one species but harms the other?

Mutualism
Commensalism
Parasitism
Amensalism
3

Parasitism benefits the parasite while harming the host, as seen in ticks feeding on a dog's blood.

Which of the following represents an example of a stable population?

Expanding age pyramid
Declining age pyramid
Bell-shaped age pyramid
Inverted age pyramid
3

A bell-shaped age pyramid indicates a stable population with birth and death rates in balance.

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