Home Subjects NEET Zoology Ecology & Environment

NEET Zoology
Ecology & Environment

Zoology questions for NEET UG — Animal Kingdom, Human Physiology, Genetics, Evolution.

100 Q 6 Topics Take Test
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Difficulty: All Easy Medium Hard 71–80 of 100
Topics in NEET Zoology
Which gas, released primarily from coal combustion and industrial processes, is a major contributor to acid rain?
A Carbon dioxide
B Sulfur dioxide
C Methane
D Nitrous oxide
Correct Answer:  B. Sulfur dioxide
EXPLANATION

Sulfur dioxide (SO₂) combines with water vapor to form sulfuric acid, which falls as acid rain, causing environmental damage.

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The Western Ghats of India are recognized globally as a biodiversity hotspot primarily because:
A They have the highest altitude in India
B They contain numerous endemic species with high endemism rates
C They cover the largest geographical area
D They have the most human population
Correct Answer:  B. They contain numerous endemic species with high endemism rates
EXPLANATION

The Western Ghats are designated as a hotspot due to exceptional plant and animal endemism, with thousands of species found nowhere else on Earth.

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Which of the following contributes MOST to eutrophication of water bodies?
A Excess nitrogen and phosphorus from fertilizers
B Plastic waste
C Heavy metals
D Oil spills
Correct Answer:  A. Excess nitrogen and phosphorus from fertilizers
EXPLANATION

Nutrient overloading from agricultural runoff causes algal blooms and oxygen depletion, directly causing eutrophication.

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The phenomenon where predators and prey population cycles show a time lag is explained by:
A Competitive exclusion
B Predator-prey oscillation
C Niche differentiation
D Resource partitioning
Correct Answer:  B. Predator-prey oscillation
EXPLANATION

Predator populations increase after prey abundance increases, creating characteristic cyclic patterns with a temporal delay between the two population peaks.

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Mycorrhizal association between fungi and plant roots is an example of:
A Commensalism
B Parasitism
C Mutualism
D Competition
Correct Answer:  C. Mutualism
EXPLANATION

Both the fungus and plant benefit: fungi gain carbohydrates while helping the plant absorb water and minerals, making it a mutualistic relationship.

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Which Indian biome is characterized by high temperature, low rainfall, and sparse vegetation?
A Tropical rainforest
B Temperate forest
C Arid desert
D Alpine meadow
Correct Answer:  C. Arid desert
EXPLANATION

The Thar Desert and other Indian desert regions exhibit high temperatures, minimal rainfall, and adapted vegetation like acacia and desert grasses.

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The process of ecological succession following a forest fire is classified as:
A Primary succession
B Secondary succession
C Tertiary succession
D Cyclic succession
Correct Answer:  B. Secondary succession
EXPLANATION

Secondary succession occurs on previously colonized areas where soil remains intact, such as after a fire. Primary succession occurs on bare rock or new land.

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Which of the following is an example of a density-dependent limiting factor?
A Earthquake
B Disease outbreak
C Hurricane
D Volcanic eruption
Correct Answer:  B. Disease outbreak
EXPLANATION

Disease spread increases with population density, making it a density-dependent factor. Natural disasters are density-independent factors.

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The 10% law in ecology states that approximately what percentage of energy is transferred from one trophic level to the next?
A 50%
B 25%
C 10%
D 1%
Correct Answer:  C. 10%
EXPLANATION

The 10% law indicates that only about 10% of energy available at one trophic level is transferred to the next level, with the rest lost as heat and through metabolic processes.

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In a pond ecosystem, phytoplankton occupy which trophic level?
A Primary consumers
B Primary producers
C Secondary consumers
D Decomposers
Correct Answer:  B. Primary producers
EXPLANATION

Phytoplankton are autotrophic organisms that produce their own food through photosynthesis, making them primary producers in aquatic ecosystems.

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