Environment & Ecology MCQ Questions 2026 – Topic-wise Practice for UPSC, SSC, Forest Services

What is the term used for the process of plants releasing water vapor into the atmosphere?

Easy

💡 Explanation

Transpiration refers to the process by which plants release water vapor into the atmosphere, which is an important component of the water cycle.

Which of the following types of waste is a major contributor to pollution in India?

Medium

💡 Explanation

Industrial waste, domestic waste, and agricultural waste all contribute to pollution in India, with significant impacts on human health and the environment.

What is the term used for the process of soil erosion caused by wind?

Easy

💡 Explanation

Wind erosion refers to the process of soil being blown away by wind, which can lead to soil loss and degradation of ecosystems.

Which of the following pollutants is a major contributor to acid rain?

Medium

💡 Explanation

Sulfur dioxide and nitrogen oxides are the primary pollutants responsible for acid rain, which can have devastating effects on ecosystems and human health.

What is the term used for the amount of living matter in a given area?

Easy

💡 Explanation

Species richness refers to the number of different species present in a given area, which is a key component of biodiversity.

Which of the following types of ecosystems is characterized by a diverse array of plant and animal species?

Medium

💡 Explanation

Tropical rainforests are among the most biodiverse ecosystems on the planet, with a vast array of plant and animal species, including many that are found nowhere else on Earth.

What is the term used for the movement of organisms from one region to another?

Easy

💡 Explanation

Migration refers to the seasonal or permanent movement of organisms from one region to another, often in search of food, water, or suitable habitats.

Which of the following species is an endangered species in India?

Medium

💡 Explanation

The Bengal tiger, Asiatic lion, and Indian rhinoceros are all endangered species in India, with declining populations due to habitat loss and human-wildlife conflict.

What is the term used for the process of water cycling through the environment?

Easy

💡 Explanation

The hydrologic cycle, also known as the water cycle, is the continuous process by which water is circulated between the Earth's oceans, atmosphere, and land surfaces.

Which of the following gases is a major contributor to the greenhouse effect?

Medium

💡 Explanation

All three gases, carbon dioxide, methane, and nitrous oxide, are potent greenhouse gases that contribute to global warming and climate change.

What is the term used for the process of converting sunlight into chemical energy by plants?

Easy

💡 Explanation

Photosynthesis is the process by which plants, algae, and some bacteria convert light energy from the sun into chemical energy in the form of organic compounds, such as glucose.