NEET Zoology — Ecology & Environment
Zoology questions for NEET UG — Animal Kingdom, Human Physiology, Genetics, Evolution.
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Showing 21–30 of 100 questions in Ecology & Environment
Which of the following represents a biotic potential in population ecology?
A The maximum rate at which a population can increase under ideal conditions
B The resistance offered by the environment to population growth
C The carrying capacity of the environment
D The death rate of a population
Correct Answer:  A. The maximum rate at which a population can increase under ideal conditions
EXPLANATION

Biotic potential refers to the inherent capacity of an organism to reproduce and increase in numbers when environmental conditions are optimal and resources are unlimited.

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The energy transfer efficiency from one trophic level to the next in an ecosystem is approximately:
A 50%
B 10%
C 25%
D 75%
Correct Answer:  B. 10%
EXPLANATION

The Lindeman 10% law states that only approximately 10% of energy is transferred from one trophic level to the next, with the remaining 90% lost as heat, respiration, and incomplete consumption.

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Which of the following is the correct sequence of ecological succession in a freshwater pond ecosystem?
A Algae → Submerged plants → Emergent plants → Terrestrial plants
B Terrestrial plants → Emergent plants → Submerged plants → Algae
C Submerged plants → Algae → Emergent plants → Terrestrial plants
D Algae → Terrestrial plants → Emergent plants → Submerged plants
Correct Answer:  A. Algae → Submerged plants → Emergent plants → Terrestrial plants
EXPLANATION

Ecological succession in freshwater ecosystems follows a predictable pattern starting with pioneer algae, progressing to submerged aquatic vegetation, then emergent plants, and finally leading to terrestrial vegetation as the habitat transitions.

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In a predator-prey relationship within Indian grasslands, population cycles demonstrate Lotka-Volterra equations. If prey population peaks, the predator population would peak approximately:
A At the same time as prey
B Before the prey population peaks
C After the prey population peaks
D Randomly without relationship to prey
Correct Answer:  C. After the prey population peaks
EXPLANATION

Lotka-Volterra cycles show predator population lags behind prey by approximately 90 degrees, peaking after prey abundance increases.

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In India's aquatic ecosystems, eutrophication is primarily caused by excessive amounts of which nutrients?
A Iron and zinc
B Nitrogen and phosphorus
C Sulfur and potassium
D Magnesium and calcium
Correct Answer:  B. Nitrogen and phosphorus
EXPLANATION

Nitrogen and phosphorus from agricultural runoff and sewage cause algal blooms and eutrophication in Indian water bodies.

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According to the Convention on Biological Diversity (CBD) which India ratified, what is the current target for protecting land-based ecosystems?
A 20% by 2025
B 30% by 2030
C 40% by 2030
D 50% by 2035
Correct Answer:  B. 30% by 2030
EXPLANATION

The CBD's post-2020 global biodiversity framework targets 30% land protection by 2030, known as the '30 by 30' target.

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Which mechanism explains the coexistence of multiple predator species in the Indian savanna without competitive exclusion?
A Niche partitioning
B Mutualism
C Parasitism
D Predation
Correct Answer:  A. Niche partitioning
EXPLANATION

Niche partitioning allows different predator species to exploit different resources or hunting strategies, reducing direct competition.

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In India's Eastern Ghats, the replacement of natural forest by monoculture plantations would result in:
A Increased species diversity
B Increased trophic levels
C Decreased genetic diversity and ecosystem stability
D Enhanced carrying capacity
Correct Answer:  C. Decreased genetic diversity and ecosystem stability
EXPLANATION

Monoculture plantations reduce species and genetic diversity, making ecosystems more vulnerable to disturbances and less stable.

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Which of the following adaptations would be most beneficial for organisms in the Thar Desert ecosystem?
A Large body size
B Nocturnal behavior and water conservation mechanisms
C Thin skin for heat dissipation
D High metabolic rate
Correct Answer:  B. Nocturnal behavior and water conservation mechanisms
EXPLANATION

Desert organisms show adaptations like nocturnal behavior to avoid heat, and physiological mechanisms to conserve water.

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In a stable tropical forest ecosystem with high biodiversity, which Shannon diversity index range would be most appropriate?
A 0.5-1.0
B 1.0-2.0
C 2.5-4.0
D 4.5-5.5
Correct Answer:  C. 2.5-4.0
EXPLANATION

High biodiversity ecosystems typically show Shannon index values between 2.5-4.0, reflecting greater species diversity and evenness.

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