UPSC Static Quiz – Environment : 6 January 2026

UPSC Static Quiz – Environment : 6 January 2026 We will post 5 questions daily on static topics mentioned in the UPSC civil services preliminary examination syllabus. Each week will focus on a specific topic from the syllabus, such as History of India and Indian National Movement, Indian and World Geography, and more. We are excited to bring you our daily UPSC Static Quiz, designed to help you prepare for the UPSC Civil Services Preliminary Examination. Each day, we will post 5 questions on static topics mentioned in the UPSC syllabus. This week, we are focusing on Indian and World Geography.

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• Question 1 of 5 1. Question Bioluminescence is the property of a living organism to produce and emit light. Which of the following organisms naturally show the property of bioluminescence? Fungi Plants Bacteria Animals Select the correct answer code: (a) 1 and 2 only (b) 1, 3, and 4 only (c) 1, 2 and 3 only (d) 1, 2, 3 and 4 Correct Solution: B Bioluminescence is a naturally occurring biological phenomenon resulting from a chemical reaction involving luciferin, luciferase, oxygen, and energy. Animals, fungi, and bacteria are well-established groups that exhibit natural bioluminescence. In animals, it is widespread in marine ecosystems—seen in jellyfish, squid, deep-sea fishes, and plankton—and also on land in organisms like fireflies, where it plays roles in communication, mating, camouflage, predation, and defense. Bioluminescent fungi, such as species of Armillaria and Mycena, emit a continuous greenish glow, often linked to ecological interactions like spore dispersal. Bioluminescent bacteria, notably Vibrio and Photobacterium, can glow independently or live symbiotically within marine animals. Plants, however, do not naturally exhibit bioluminescence. Any glowing observed in plants is usually due to symbiotic microorganisms, fungal infection, or artificial genetic modification in laboratory settings. Incorrect Solution: B Bioluminescence is a naturally occurring biological phenomenon resulting from a chemical reaction involving luciferin, luciferase, oxygen, and energy. Animals, fungi, and bacteria are well-established groups that exhibit natural bioluminescence. In animals, it is widespread in marine ecosystems—seen in jellyfish, squid, deep-sea fishes, and plankton—and also on land in organisms like fireflies, where it plays roles in communication, mating, camouflage, predation, and defense. Bioluminescent fungi, such as species of Armillaria and Mycena, emit a continuous greenish glow, often linked to ecological interactions like spore dispersal. Bioluminescent bacteria, notably Vibrio and Photobacterium, can glow independently or live symbiotically within marine animals. Plants, however, do not naturally exhibit bioluminescence. Any glowing observed in plants is usually due to symbiotic microorganisms, fungal infection, or artificial genetic modification in laboratory settings.

#### 1. Question

Bioluminescence is the property of a living organism to produce and emit light. Which of the following organisms naturally show the property of bioluminescence?

Select the correct answer code:

• (a) 1 and 2 only

• (b) 1, 3, and 4 only

• (c) 1, 2 and 3 only

• (d) 1, 2, 3 and 4

Solution: B

• Bioluminescence is a naturally occurring biological phenomenon resulting from a chemical reaction involving luciferin, luciferase, oxygen, and energy.

• Animals, fungi, and bacteria are well-established groups that exhibit natural bioluminescence. In animals, it is widespread in marine ecosystems—seen in jellyfish, squid, deep-sea fishes, and plankton—and also on land in organisms like fireflies, where it plays roles in communication, mating, camouflage, predation, and defense.

• Bioluminescent fungi, such as species of Armillaria and Mycena, emit a continuous greenish glow, often linked to ecological interactions like spore dispersal. Bioluminescent bacteria, notably Vibrio and Photobacterium, can glow independently or live symbiotically within marine animals.

• Plants, however, do not naturally exhibit bioluminescence. Any glowing observed in plants is usually due to symbiotic microorganisms, fungal infection, or artificial genetic modification in laboratory settings.

Solution: B

• Bioluminescence is a naturally occurring biological phenomenon resulting from a chemical reaction involving luciferin, luciferase, oxygen, and energy.

• Question 2 of 5 2. Question Consider the following statements regarding Black corals. Black corals are located in the Great Barrier Reef and Coral Sea off the coast of Australia. They are filter feeders and eat tiny zooplankton that are abundant in deep waters. They are found only in deep waters and they cannot survive in shallow waters. They act as important habitats where fish and invertebrates feed and hide from predators. Which of the above statements are correct? (a) 1 and 2 only (b) 1, 2, and 4 only (c) 1, 2 and 3 only (d) 1, 2, 3 and 4 Correct Solution: B Black corals (order Antipatharia) are widely distributed across the world’s oceans, including the Great Barrier Reef and the Coral Sea region off Australia, making statement 1 correct. They are sessile suspension feeders that capture tiny zooplankton and organic particles from passing currents using their polyps, which supports statement 2. These corals are ecologically significant habitat-forming species, creating complex three-dimensional structures that provide shelter, feeding grounds, and nursery areas for fish and invertebrates, thereby validating statement 4. Statement 3 is incorrect because black corals are not restricted exclusively to deep waters. While many species are abundant in mesophotic and deep-sea environments, several species are known to occur in relatively shallow waters, especially in regions with low light, strong currents, or overhangs. Their depth distribution is therefore broad and not confined solely to deep-water ecosystems. Hence, only statements 1, 2, and 4 are correct. Incorrect Solution: B Black corals (order Antipatharia) are widely distributed across the world’s oceans, including the Great Barrier Reef and the Coral Sea region off Australia, making statement 1 correct. They are sessile suspension feeders that capture tiny zooplankton and organic particles from passing currents using their polyps, which supports statement 2. These corals are ecologically significant habitat-forming species, creating complex three-dimensional structures that provide shelter, feeding grounds, and nursery areas for fish and invertebrates, thereby validating statement 4. Statement 3 is incorrect because black corals are not restricted exclusively to deep waters. While many species are abundant in mesophotic and deep-sea environments, several species are known to occur in relatively shallow waters, especially in regions with low light, strong currents, or overhangs. Their depth distribution is therefore broad and not confined solely to deep-water ecosystems. Hence, only statements 1, 2, and 4 are correct.

#### 2. Question

Consider the following statements regarding Black corals.

• Black corals are located in the Great Barrier Reef and Coral Sea off the coast of Australia.

• They are filter feeders and eat tiny zooplankton that are abundant in deep waters.

• They are found only in deep waters and they cannot survive in shallow waters.

• They act as important habitats where fish and invertebrates feed and hide from predators.

Which of the above statements are correct?

• (a) 1 and 2 only

• (b) 1, 2, and 4 only

• (c) 1, 2 and 3 only

• (d) 1, 2, 3 and 4

Solution: B

• Black corals (order Antipatharia) are widely distributed across the world’s oceans, including the Great Barrier Reef and the Coral Sea region off Australia, making statement 1 correct.

• They are sessile suspension feeders that capture tiny zooplankton and organic particles from passing currents using their polyps, which supports statement 2.

• These corals are ecologically significant habitat-forming species, creating complex three-dimensional structures that provide shelter, feeding grounds, and nursery areas for fish and invertebrates, thereby validating statement 4.

Statement 3 is incorrect because black corals are not restricted exclusively to deep waters. While many species are abundant in mesophotic and deep-sea environments, several species are known to occur in relatively shallow waters, especially in regions with low light, strong currents, or overhangs. Their depth distribution is therefore broad and not confined solely to deep-water ecosystems. Hence, only statements 1, 2, and 4 are correct.

Solution: B

• Black corals (order Antipatharia) are widely distributed across the world’s oceans, including the Great Barrier Reef and the Coral Sea region off Australia, making statement 1 correct.

• They are sessile suspension feeders that capture tiny zooplankton and organic particles from passing currents using their polyps, which supports statement 2.

• Question 3 of 5 3. Question The phenomenon of increasing concentration of a substance, such as a toxic chemical, in the tissues of tolerant organisms at successively higher levels in a food chain is known as: a) Biodilution b) Biosparging c) Biomagnification d) Bioaccumulation Correct Solution: C Biomagnification refers to the progressive increase in concentration of persistent, non-biodegradable, and fat-soluble substances as they move up successive trophic levels in a food chain. Substances such as mercury, DDT, PCBs, and other persistent organic pollutants are not easily metabolized or excreted by organisms. As a result, primary producers or lower-level consumers accumulate small amounts, which are then transferred to higher consumers when they are eaten. Because predators consume many individuals from lower trophic levels, the toxin concentration becomes increasingly magnified in their tissues. This is why top predators—such as birds of prey, large fish, and humans—often suffer the most severe toxic effects. Incorrect Solution: C Biomagnification refers to the progressive increase in concentration of persistent, non-biodegradable, and fat-soluble substances as they move up successive trophic levels in a food chain. Substances such as mercury, DDT, PCBs, and other persistent organic pollutants are not easily metabolized or excreted by organisms. As a result, primary producers or lower-level consumers accumulate small amounts, which are then transferred to higher consumers when they are eaten. Because predators consume many individuals from lower trophic levels, the toxin concentration becomes increasingly magnified in their tissues. This is why top predators—such as birds of prey, large fish, and humans—often suffer the most severe toxic effects.

#### 3. Question

The phenomenon of increasing concentration of a substance, such as a toxic chemical, in the tissues of tolerant organisms at successively higher levels in a food chain is known as:

• a) Biodilution

• b) Biosparging

• c) Biomagnification

• d) Bioaccumulation

Solution: C

• Biomagnification refers to the progressive increase in concentration of persistent, non-biodegradable, and fat-soluble substances as they move up successive trophic levels in a food chain.

• Substances such as mercury, DDT, PCBs, and other persistent organic pollutants are not easily metabolized or excreted by organisms. As a result, primary producers or lower-level consumers accumulate small amounts, which are then transferred to higher consumers when they are eaten. Because predators consume many individuals from lower trophic levels, the toxin concentration becomes increasingly magnified in their tissues.

• This is why top predators—such as birds of prey, large fish, and humans—often suffer the most severe toxic effects.

Solution: C

• Biomagnification refers to the progressive increase in concentration of persistent, non-biodegradable, and fat-soluble substances as they move up successive trophic levels in a food chain.

• This is why top predators—such as birds of prey, large fish, and humans—often suffer the most severe toxic effects.

• Question 4 of 5 4. Question Consider the following statements. Panthera is the genus of large wild cats that include lion, leopard, and jaguar. Tiger is the largest of all wild cats. India is the only country having Tiger as its national animal. How many of the above statements is/are incorrect? a) Only one b) Only two c) All three d) None Correct Solution: A Statement 3 is incorrect. Panthera: This is the genus of large wild cats that can roar, but can’t purr. Among them, the lion, the leopard, and the jaguar are more closely related, while the other strand has the tiger and the snow leopard. The snow leopard is an exception to the rest of the group in that it can’t roar. Jim Corbett’s “large-hearted gentleman with boundless courage”, the solitary and strongly territorial tiger is the largest of all wild cats and also the earliest Panthera member to exist. Primarily a forest animal, they range from the Siberian taiga to the Sunderban delta. The national animal of India, Bangladesh, Malaysia, and South Korea, the tiger was voted the world’s favourite animal ahead of the dog in a 2004 Animal Planet global online poll. Incorrect Solution: A Statement 3 is incorrect. Panthera: This is the genus of large wild cats that can roar, but can’t purr. Among them, the lion, the leopard, and the jaguar are more closely related, while the other strand has the tiger and the snow leopard. The snow leopard is an exception to the rest of the group in that it can’t roar. Jim Corbett’s “large-hearted gentleman with boundless courage”, the solitary and strongly territorial tiger is the largest of all wild cats and also the earliest Panthera member to exist. Primarily a forest animal, they range from the Siberian taiga to the Sunderban delta. The national animal of India, Bangladesh, Malaysia, and South Korea, the tiger was voted the world’s favourite animal ahead of the dog in a 2004 Animal Planet global online poll.

#### 4. Question

Consider the following statements.

• Panthera is the genus of large wild cats that include lion, leopard, and jaguar.

• Tiger is the largest of all wild cats.

• India is the only country having Tiger as its national animal.

How many of the above statements is/are incorrect?

• a) Only one

• b) Only two

• c) All three

Solution: A

Statement 3 is incorrect.

Panthera:

This is the genus of large wild cats that can roar, but can’t purr. Among them, the lion, the leopard, and the jaguar are more closely related, while the other strand has the tiger and the snow leopard. The snow leopard is an exception to the rest of the group in that it can’t roar.

Jim Corbett’s “large-hearted gentleman with boundless courage”, the solitary and strongly territorial tiger is the largest of all wild cats and also the earliest Panthera member to exist. Primarily a forest animal, they range from the Siberian taiga to the Sunderban delta. The national animal of India, Bangladesh, Malaysia, and South Korea, the tiger was voted the world’s favourite animal ahead of the dog in a 2004 Animal Planet global online poll.

Solution: A

Statement 3 is incorrect.

Panthera:

• Question 5 of 5 5. Question Consider the following statements regarding Carbon neutrality. Carbon neutrality refers to achieving net zero carbon dioxide emissions. It can be achieved through carbon offsetting or eliminating carbon dioxide emissions altogether. Renewable energy always produce zero carbon emissions. How many of the above statements is/are correct? a) Only one b) Only two c) All three d) None Correct Solution: B Statement 3 is incorrect. Carbon neutrality refers to achieving net zero carbon dioxide emissions by balancing carbon dioxide emissions with removal (often through carbon offsetting) or simply eliminating carbon dioxide emissions altogether (the transition to the “post-carbon economy”). Although both renewable and non-renewable energy both produce carbon emissions in some form, renewable energy has a lesser to almost zero carbon emissions. Incorrect Solution: B Statement 3 is incorrect. Carbon neutrality refers to achieving net zero carbon dioxide emissions by balancing carbon dioxide emissions with removal (often through carbon offsetting) or simply eliminating carbon dioxide emissions altogether (the transition to the “post-carbon economy”). Although both renewable and non-renewable energy both produce carbon emissions in some form, renewable energy has a lesser to almost zero carbon emissions.

#### 5. Question

Consider the following statements regarding Carbon neutrality.

• Carbon neutrality refers to achieving net zero carbon dioxide emissions.

• It can be achieved through carbon offsetting or eliminating carbon dioxide emissions altogether.

• Renewable energy always produce zero carbon emissions.

How many of the above statements is/are correct?

• a) Only one

• b) Only two

• c) All three

Solution: B

Statement 3 is incorrect.

Carbon neutrality refers to achieving net zero carbon dioxide emissions by balancing carbon dioxide emissions with removal (often through carbon offsetting) or simply eliminating carbon dioxide emissions altogether (the transition to the “post-carbon economy”).

Although both renewable and non-renewable energy both produce carbon emissions in some form, renewable energy has a lesser to almost zero carbon emissions.

Solution: B

Statement 3 is incorrect.

Although both renewable and non-renewable energy both produce carbon emissions in some form, renewable energy has a lesser to almost zero carbon emissions.

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