Populations & Ecosystems Test - 2

In the ecosystem, the flow of energy takes place in only one direction i.e.  from producers to final consumers.
The energy  present in one trophic level never returns back to the producer.

Energy flow in our ecosystem:

Net primary productivity (NPP) is equal to Gross primary productivity (GPP) minus Respiration loss (R). NPP is the available biomass for the consumption of heterotrophs in the ecosystem.

• Phytoplanktons are small floating photosynthetic unicellular plant.
• In the aquatic ecosystem phytoplankton are producers that fix solar energy by the process of photosynthesis.

Aquatic Food Chain:

The components of the ecosystem are seen to function as a unit when the aspect is decomposition.

• It is a part of the nutrient cycle in which organic substances are broken down into simpler organic matter.

The term ecosystem was first used in 1935 in a publication by British ecologist  Arthur Tansley . Tansley  devised the concept to draw attention to the importance of transfers of materials between organisms and their environment.

Pyramid of energy is always erect and upright because the amount of energy get reduce at each trophic level from prouder to consumers.

Ecological parameter includes, biomass, energy and number of individual in the ecosystem. Stratification is not a part of ecological parameter.

Primary productivity is the amount of biomass produced per unit area by green plants in an ecosystem. Producers fix the solar energy by the process of photosynthesis.

Nepenthes (pitcher plant) and Drocera are insectivores plants to compensate for their protein requirement. They have green leaves that perform the photosynthesis process. So, they act as both producers as well as consumers.

Ecosystem is the functional and dynamic unit of nature where living and non-living components interact with each other for flow of energy and biomass from producer to consumers.