ICSE Class 12 Environmental Science — Flashcards for Quick Revision

A: The environmental movement is also called the ecological movement. It is a scientific, social, and political movement for conserving nature, natural resources, and green policies to address environmen

A: It includes many groups such as citizens, scientists, politicians, NGOs, religious devotees, industrialists, and forest departments. Their beliefs, interests, and methods are different, so the movemen

A: The National Park Service was founded by US President Woodrow Wilson in 1916. It became an important step toward professional management of natural resources.

A: A population is the total number of individuals of the same species found in a particular geographical area.

A: A deme is a local population of a polytypic species that actively interbreeds and shares a distinct gene pool. It is a subdivision of a population within a geographical area.

A: Population density is calculated by the formula D = N/S, where D = density, N = total number of individuals, and S = area. It tells how crowded a population is in a given space.

A: An ecosystem is a self-sustaining, self-regulating structural and functional unit of nature. It consists of a community of living beings and their physical environment, and both interact with each oth

A: An ecosystem is called an open system because it receives solar energy as input, uses it for productivity, transfers energy from one trophic level to the next, and releases waste matter as output. Nut

A: An ecosystem provides free services such as soil formation, soil protection, fresh air, climate regulation, nutrient cycling, pollination, grazing grounds, and support for wildlife. For example, plant