Energy Flow & Nutrient Cycling — NEET Biology
📚 Practice ConceptEnergy flow is unidirectional. First, plants capture solar energy and then, food is transferred from the producers to decomposers. Organisms of different trophic levels in nature are connected to each other for food or energy relationship forming a food chain. The storage and movement of nutrient elements through the various components of the ecosystem is called nutrient cycling; nutrients are repeatedly used through this process. Nutrient cycling is of two types—gaseous and sedimentary. Atmosphere or hydrosphere is the reservoir for the gaseous type of cycle (carbon), whereas Earth's crust is the reservoir for sedimentary type (phosphorus). Products of ecosystem processes are named as ecosystem services, e.g., purification of air and water by forests.
Assertion (A): Nutrient cycles are classified into gaseous and sedimentary types based on their reservoirs. Reason (R): The carbon cycle is sedimentary with Earth’s crust as reservoir, while the phosphorus cycle is gaseous with atmosphere as reservoir.
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