Hydrofluorocarbons (HFCs) are synthetic chemicals widely employed in industries, mainly for refrigeration and cooling purposes. These man-made compounds were introduced as alternatives to ozone-depleting substances that are being phased out under the Montreal Protocol. HFCs are specifically designed for applications in refrigeration, air-conditioning, aerosol propellants, and insulating foams, with additional, smaller roles in fire protection and as solvents. Unlike some other compounds, HFCs lack lubricating properties. Therefore, the correct option is Only three.

Here’s an explanation for each statement:

1. Some microorganisms can grow in environments with temperatures above the boiling point of water: This is correct. Certain microorganisms, known as thermophiles or hyperthermophiles, can thrive in extremely hot environments, such as hydrothermal vents, where temperatures exceed 100°C (the boiling point of water at sea level).
2. Some microorganisms can grow in environments with temperatures below the freezing point of water: This is correct. Psychrophiles are microorganisms that can grow in extremely cold environments, including those with temperatures below 0°C, such as in polar regions or glaciers.
3. Some microorganisms can grow in a highly acidic environment with a pH below 3: This is correct. Acidophiles are microorganisms that can thrive in highly acidic conditions, including environments with pH levels as low as 1, such as in acid mine drainage or acidic hot springs.

Thus, all three statements are correct. The correct answer is All three.

Let’s analyze each statement to determine its correctness:

1. Some mushrooms have medicinal properties: This is true. Certain mushrooms, such as Reishi and Shiitake, are known for their medicinal benefits, including immune-boosting and anti-inflammatory properties.
2. Some mushrooms have psychoactive properties: This is also true. Psilocybin mushrooms, often called “magic mushrooms,” contain psychoactive compounds that can alter perception and mood.
3. Some mushrooms have insecticidal properties: True. Some fungi, like Beauveria bassiana, produce compounds that act as natural insecticides, infecting and killing various insect species.
4. Some mushrooms have bioluminescent properties: True as well. Certain mushrooms, such as Panellus stipticus and Mycena chlorophos, exhibit bioluminescence and emit a glowing light.

All four statements are correct. Therefore, the correct answer is: All four

1. Lion-tailed Macaque: This species is primarily diurnal, meaning it is active during the day and rests at night. They are known for their distinctive mane and tail tuft, and they inhabit the rainforests of the Western Ghats in India.
2. Malabar Civet: The Malabar Civet is generally nocturnal. It is most active during the night and is rarely seen during the day. It is a critically endangered species native to the Western Ghats and nearby regions.
3. Sambar Deer: The Sambar Deer is largely nocturnal or crepuscular (active during twilight). It tends to be most active during the early morning and late evening but can also be seen foraging at night.

Given this information, two of the listed fauna (Malabar Civet and Sambar Deer) are generally nocturnal or most active after sunset. Therefore, the correct answer is: Only two.

Let’s analyze the statements:

Statement-I: Marsupials are not naturally found in India. This statement is correct. Marsupials, such as kangaroos and koalas, are primarily found in Australia and nearby islands. They are not native to India.

Statement-II: Marsupials can thrive only in montane grasslands with no predators. This statement is incorrect. Marsupials inhabit a wide variety of environments, including forests, grasslands, and deserts. They are not limited to montane grasslands and can coexist with predators, as evidenced by their presence in diverse habitats in Australia, where they have adapted to various ecological niches.

Therefore, the correct answer is: Statement-I is correct but Statement-II is incorrect.