Which Indian biome is characterized by high temperature, low rainfall, and sparse vegetation?
Answer: C
The Thar Desert and other Indian desert regions exhibit high temperatures, minimal rainfall, and adapted vegetation like acacia and desert grasses.
Q.422Medium
Mycorrhizal association between fungi and plant roots is an example of:
Answer: C
Both the fungus and plant benefit: fungi gain carbohydrates while helping the plant absorb water and minerals, making it a mutualistic relationship.
Q.423Medium
The phenomenon where predators and prey population cycles show a time lag is explained by:
Answer: B
Predator populations increase after prey abundance increases, creating characteristic cyclic patterns with a temporal delay between the two population peaks.
Q.424Medium
Which of the following contributes MOST to eutrophication of water bodies?
Answer: A
Nutrient overloading from agricultural runoff causes algal blooms and oxygen depletion, directly causing eutrophication.
Q.425Medium
The Western Ghats of India are recognized globally as a biodiversity hotspot primarily because:
Answer: B
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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Q.426Easy
Which gas, released primarily from coal combustion and industrial processes, is a major contributor to acid rain?
Answer: B
Sulfur dioxide (SO₂) combines with water vapor to form sulfuric acid, which falls as acid rain, causing environmental damage.
Q.427Easy
In the nitrogen cycle, the conversion of atmospheric nitrogen to ammonia by bacteria is called:
Answer: B
Nitrogen fixation is the process where atmospheric N₂ is converted to ammonia by nitrogen-fixing bacteria, making it available to organisms.
Q.428Medium
The carrying capacity of an environment is determined by:
Answer: B
Carrying capacity is the maximum population size an environment can sustain indefinitely, determined by food, water, space, and other limiting factors.
Q.429Medium
Which of the following is the primary cause of habitat fragmentation in India's biodiversity hotspots?
Answer: B
Habitat fragmentation is predominantly caused by human activities like agricultural development, construction, and urban sprawl, dividing continuous ecosystems into isolated patches.
Q.430Medium
The concept of ecological niche differs from habitat in that niche refers to:
Answer: B
While habitat is 'where' an organism lives, niche describes 'how' it lives—its function, food preferences, behavioral patterns, and ecological role.
Rhizobium bacteria form symbiotic relationships with legume roots, fixing atmospheric nitrogen into ammonia and nitrates usable by plants.
Q.432Hard
The phenomenon of biomagnification poses serious health risks because:
Answer: B
Biomagnification causes toxic substances like DDT and heavy metals to accumulate in higher concentrations as they move up the food chain, affecting apex predators most severely.
Q.433Hard
Climate change in India is predicted to most severely impact which agricultural region?
Answer: B
Himalayan glaciers are melting at accelerated rates due to climate change, threatening water supplies for millions in northern India and affecting downstream agriculture.
Q.434Hard
The concept of 'tragedy of the commons' in environmental management refers to:
Answer: B
The tragedy of the commons occurs when individuals act in self-interest to exploit shared resources (like fisheries or forests), leading to overall depletion and collective loss.
Q.435Hard
Which regulatory mechanism would most effectively reduce plastic pollution in Indian coastal ecosystems?
Answer: B
While multiple factors contribute to ocean health, addressing single-use plastic directly tackles the primary source of marine plastic pollution through policy and behavioral change.
Q.436Medium
Which of the following organisms would show the highest concentration of pesticide residues in an aquatic food chain?
Answer: C
Bioaccumulation and biomagnification increase at higher trophic levels. Top predators accumulate the highest pesticide concentrations.
Q.437Easy
In a forest ecosystem, if the population of herbivores suddenly increases, what would be the immediate consequence?
Answer: B
Increased herbivore population leads to higher consumption of plant material, resulting in decreased plant biomass.
Q.438Easy
Which of the following best describes the relationship between a tapeworm and its human host?
Answer: B
Tapeworm derives nutrition from host while causing harm, exemplifying parasitism.
Q.439Medium
According to the 10% law of energy transfer, if primary producers in an ecosystem contain 10,000 kcal of energy, how much energy would be available to secondary consumers?
Answer: B
Energy transfer: 10,000 kcal (producers) → 1,000 kcal (primary consumers) → 100 kcal (secondary consumers). Each trophic transfer retains ~10%.
Q.440Medium
Which succession type would occur on bare rock in the Western Ghats with no previous soil?
Answer: B
Primary succession occurs on bare substrate with no pre-existing soil. Lichens and mosses are pioneer species.
