ICSE Class 9 Environmental Science — Flashcards

A: The environment is the sum total of all natural and human-made conditions that surround and influence living organisms.

A: It includes physical, biological, human, and natural resource components. These parts are linked together and affect one another.

A: The term environment comes from the French word environ, meaning to surround.

A: Sunlight provides the light energy needed to start photosynthesis. Chlorophyll in chloroplasts absorbs this light energy and uses it to make food in the form of glucose.

A: Photosynthesis is the biological process by which green plants use carbon dioxide and water in the presence of sunlight to prepare their food in the form of glucose, releasing oxygen as a by-product.

A: Photosynthesis takes place in chloroplasts, which contain chlorophyll. Chlorophyll is a green pigment that absorbs sunlight.

A: Biodiversity is the total variety of life and the interactions among organisms within ecosystems. It includes genetic diversity, species diversity, and ecosystem diversity.

A: Biodiversity helps ecosystems stay stable, productive, and resilient. It supports air, water, food, medicines, raw materials, and natural balance in nature.

A: The three main types are genetic diversity, species diversity, and ecosystem diversity.