Functional unit of nature is termed as

Trees in a forest, fish in a river, horseflies on a farm, lemurs in the jungle, reeds in a pond, worms in the soil — all these plants and animals are made of the building blocks we call cells. Like these examples, many living things consist of vast numbers of cells working in concert with one another. Other forms of life, however, are made of only a single cell, such as the many species of bacteria and protozoa. Cells, whether living on their own or as part of a multicellular organism, are usually too small to be seen without a light microscope. Cells share many common features, yet they can look wildly different. In fact, cells have adapted over billions of years to a wide array of environments and functional roles. Nerve cells, for example, have long, thin extensions that can reach for meters and serve to transmit signals rapidly. Closely fitting, brick-shaped plant cells have a rigid outer layer that helps provide the structural support that trees and other plants require. Long, tapered muscle cells have an intrinsic stretchiness that allows them to change length within contracting and relaxing biceps. Still, as different as these cells are, they all rely on the same basic strategies to keep the outside out, allow necessary substances in and permit others to leave, maintain their health, and replicate themselves. In fact, these traits are precisely what make a cell a cell. © 2010 Cells are considered the basic units of life in part because they come in discrete and easi...

A functional unit of nature, where living organisms interact among themselves and also with the surrounding physical environment, is called as: 1. A population 2. A species 3. A biological community 4. An ecosystem Essentiale: Ecosystem Ecosystem Masterclass in Biology 2 NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers Consider the two statements: Statement I: Entire biosphere is regarded as a global ecosystem by many ecologists. Statement II: The global ecosystem is divided into terrestrial and aquatic ecosystem for convenience. 1. Only Statement I is correct. 2. Only Statement II is correct. 3. Both Statement I and Statement II are correct. 4. Both Statement I and Statement II are incorrect. Study the given diagram and select the correct statements: Statement I: There is unidirectional movement of energy towards the higher trophic levels and its dissipation and loss as heat to the environment. Statement II: Nutrients are never lost from the ecosystems, rather they are recycled time and again indefinitely. 1. Only Statement I is correct. 2. Only Statement II is correct. 3. Both Statement I and Statement II are correct. 4. Both Statement I and Statement II are incorrect. Study the given diagram and select the correct statements: Statement I: Tropical land areas have the highest rates of production. Statement II: Oceans have low productivity. 1. Only Statement I is correct...

- A community is a group of organisms of different species that live together in a given area. A community represents only the living or biotic components of an ecosystem. - An ecosystem is nature's functional unit where the living organisms belonging to its biotic community interact with one another and also with its abiotic components to form a self-sustained stable system. - The population is the number of organisms of a single species present in a particular geographical area at a particular time. - Ecological succession is a steady and gradual change in the composition and structure of biotic communities in an area with a changing environment. It is predictable, sequential, and in accordance with the changing physical environment. Hence, the correct option is B.