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NEET UG
NEET Zoology

NEET UG MCQ questions — Physics, Chemistry, Botany & Zoology for medical entrance.

540 Q 4 Subjects 12th (PCB)
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Difficulty: All Easy Medium Hard 71–80 of 540
Subjects in NEET UG
Q.71 Medium NEET Zoology Ecology & Environment
According to India's Climate Action Plan, what is the target reduction in carbon emissions intensity by 2030?
A 35% from 2005 levels
B 45% from 2005 levels
C 50% from 2005 levels
D 60% from 2005 levels
Correct Answer:  B. 45% from 2005 levels
EXPLANATION

India has committed to reducing emissions intensity by 45% by 2030 from 2005 baseline levels as part of its NDC.

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Q.72 Medium NEET Zoology Ecology & Environment
In India's mangrove ecosystems, which species serves as the keystone species maintaining ecosystem structure?
A Avicennia marina
B Rhizophora mucronata
C Saltwater crocodile
D Mud crabs
Correct Answer:  B. Rhizophora mucronata
EXPLANATION

Rhizophora species form the structural foundation of mangrove ecosystems, providing nursery grounds and stabilizing sediment for other organisms.

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Q.73 Medium NEET Zoology Ecology & Environment
Which of the following represents a density-dependent factor in the Indian subcontinent ecosystems?
A Monsoon rainfall variation
B Interspecific competition for resources
C Typhoons
D Solar radiation
Correct Answer:  B. Interspecific competition for resources
EXPLANATION

Interspecific competition is density-dependent as its effect increases with population density. Environmental factors like rainfall are density-independent.

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Q.74 Medium NEET Zoology Ecology & Environment
In the bioaccumulation of DDT pesticide in aquatic food chains, which organism typically shows the highest concentration?
A Phytoplankton
B Zooplankton
C Fish
D Fish-eating birds
Correct Answer:  D. Fish-eating birds
EXPLANATION

Biomagnification causes DDT concentration to increase at higher trophic levels, with apex predators (birds) showing highest concentrations.

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Q.75 Medium NEET Zoology Ecology & Environment
Which statement about India's Project Tiger is most accurate?
A Tiger population has remained constant since 1973
B Tiger population increased from ~1400 (2006) to ~3700+ (2023)
C All tiger reserves are located in Northeast India
D Project Tiger includes only terrestrial ecosystems
Correct Answer:  B. Tiger population increased from ~1400 (2006) to ~3700+ (2023)
EXPLANATION

India's tiger population has shown significant recovery, increasing from approximately 1400 tigers in 2006 to over 3700 by 2023 census.

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Q.76 Medium NEET Zoology Ecology & Environment
In India's coral reef ecosystems, what is the primary cause of coral bleaching observed in the Andaman and Nicobar Islands since 2020?
A Overfishing
B Rising sea surface temperatures
C Plastic pollution
D Acid rain
Correct Answer:  B. Rising sea surface temperatures
EXPLANATION

Elevated sea surface temperatures stress coral-zooxanthellae relationships, causing bleaching. This has been documented extensively in Andaman reefs.

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Q.77 Easy NEET Zoology Ecology & Environment
Which biotic potential would be highest for a species in ideal laboratory conditions?
A Carrying capacity
B Intrinsic rate of increase
C Environmental resistance
D Population density
Correct Answer:  B. Intrinsic rate of increase
EXPLANATION

Intrinsic rate of increase (biotic potential) is expressed as λ and represents maximum reproductive capacity under ideal conditions.

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Q.78 Medium NEET Zoology Ecology & Environment
In a forest biome, if 1000 kg of plant biomass is available at the producer level, approximately how much energy would be available at the secondary consumer level (assuming 10% energy transfer)?
A 100 kg
B 10 kg
C 1 kg
D 0.1 kg
Correct Answer:  B. 10 kg
EXPLANATION

Following the 10% law: Producers (1000 kg) → Primary consumers (100 kg) → Secondary consumers (10 kg).

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Q.79 Medium NEET Zoology Ecology & Environment
According to India's National Green Tribunal (NGT) 2024 decisions, which industrial effluent poses the greatest threat to the Yamuna River ecosystem?
A Textile dye effluents
B Leather tanning waste
C Sugar mill effluents
D Pharmaceutical waste
Correct Answer:  B. Leather tanning waste
EXPLANATION

Leather tanning wastes contain high concentrations of chromium and other heavy metals that severely degrade aquatic ecosystems.

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Q.80 Easy NEET Zoology Ecology & Environment
Which succession type occurs on newly formed volcanic islands like those in the Indian Ocean?
A Secondary succession
B Primary succession
C Cyclical succession
D Retrogressive succession
Correct Answer:  B. Primary succession
EXPLANATION

Primary succession occurs on bare, lifeless substrates where no soil exists, such as newly formed volcanic islands.

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