Biology Ecosystem part 24 (Question 2) class 12 XII | Summary and Q&A

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August 6, 2015
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Biology Ecosystem part 24 (Question 2) class 12 XII

TL;DR

This video provides an overview of ecosystem components, including litter and detritus, and explains the factors affecting primary productivity and the features of the phosphorus cycle in the ecosystem.

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Questions & Answers

Q: How do litter and detritus differ from each other?

Litter refers to waste products like plastics and papers, while detritus refers to the remains of dead plants and animals. Litter includes both biodegradable and non-biodegradable matter, while detritus consists only of biodegradable matter.

Q: What are the components of an ecosystem?

An ecosystem consists of biotic components (living organisms) and abiotic components (non-living). Biotic components include animals, birds, and insects, while abiotic components include soil, water, and air.

Q: What is primary productivity and what factors affect it?

Primary productivity is the amount of biomass produced by plants during photosynthesis. Factors that affect primary productivity include plant species, nutrient availability, and environmental factors like climate and water availability.

Q: What are the important features of the phosphorus cycle in an ecosystem?

The phosphorus cycle is a sedimentary cycle, with the Earth's crust serving as the natural reservoir for phosphorus. Phosphorus is present in the form of phosphates in rocks and slowly cycles through soil, plants, animals, and decomposers. It is a slow cycle and may have locked nutrient elements in reservoirs, making it less perfect compared to gaseous cycles.

Summary & Key Takeaways

  • The video distinguishes between litter and detritus, defining litter as various waste products like plastics and papers, and detritus as the remains of dead plants and animals.

  • An ecosystem consists of biotic (living organisms) and abiotic (non-living) components, such as soil, water, and air.

  • Primary productivity refers to the amount of biomass produced by plants during photosynthesis and is influenced by factors like plant species, nutrient availability, and environmental factors.

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