Organisms and Population
Test 3

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following is an example of amensalism?

Cattle egret and grazing cattle
Penicillium releasing antibiotics inhibiting bacterial growth
Bee and flower interaction
Tiger preying on deer
2

Amensalism occurs when one species is harmed while the other remains unaffected, such as fungi releasing antibiotics that inhibit bacterial growth.

Which scientist is considered the ‘Father of Ecology’ in India?

Salim Ali
J.C. Bose
Ramdeo Misra
M.S. Swaminathan
3

Ramdeo Misra is regarded as the ‘Father of Ecology’ in India for his contributions to ecological research and teaching.

Which of the following species interactions is NOT a form of symbiosis?

Parasitism
Mutualism
Commensalism
Competition
4

Symbiosis involves close and prolonged interactions between species, while competition is a struggle for limited resources without direct dependency.

Which of the following statements about invasive species is correct?

Invasive species always increase biodiversity.
They can outcompete native species and disrupt ecosystems.
They have no impact on ecosystem stability.
Invasive species are always introduced intentionally by humans.
2

Invasive species often outcompete native species, leading to reduced biodiversity and ecosystem disruption.

Which of the following statements about trophic levels is incorrect?

Producers form the first trophic level.
Energy transfer between trophic levels is 100% efficient.
Primary consumers feed directly on producers.
Decomposers recycle nutrients back into the ecosystem.
2

Energy transfer between trophic levels is inefficient, with only about 10% being passed on.

Which of the following statements about competition is correct?

Intraspecific competition occurs between different species.
Interspecific competition occurs between members of the same species.
Competitive exclusion principle states that two species competing for the same resource cannot coexist indefinitely.
Competition always leads to the extinction of one species.
3

The competitive exclusion principle states that two species cannot coexist indefinitely if they compete for the same limiting resource.

Which of the following statements about age pyramids is incorrect?

A broad-based pyramid indicates a growing population.
A bell-shaped pyramid represents a stable population.
An inverted pyramid represents a rapidly growing population.
Age pyramids provide insights into future population trends.
3

An inverted age pyramid represents a declining population, not a rapidly growing one.

What is the term for a species that plays a crucial role in maintaining ecosystem stability?

Invasive species
Keystone species
Endangered species
Exotic species
2

Keystone species have a disproportionate impact on their ecosystem, influencing species diversity and stability.

Which type of plant defense mechanism is represented by thorns on Acacia?

Chemical defense
Morphological defense
Physiological defense
Symbiotic defense
2

Thorns are a morphological defense that protect plants from herbivores by deterring feeding.

Which of the following interactions is an example of brood parasitism?

Tiger preying on deer
Cuckoo laying eggs in a crow’s nest
Clownfish living among sea anemone
Orchid growing on a tree
2

Brood parasitism occurs when one species lays its eggs in another species' nest, as seen in cuckoos using crow nests for incubation.

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