Q.Name of the food chain which is generally present in all type of ecosystem. Explain and write their significance.

Step 1. The chapter states of the detritus food chain, 'This type of food chain is present in all ecosystems,' distinguishing it from the grazing food chain, which specifically depends on the presence of living green-plant producers to begin.

Step 2. The detritus food chain begins with dead organic matter (detritus — dead plants, animals and their excreta) rather than living biomass, and this dead-matter energy source is passed through detritivores (e.g. earthworm) to small carnivores (e.g. blackbird) and finally to top carnivores (e.g. hawk).

Step 3. Because every ecosystem produces dead organic matter continuously (fallen leaves, dead animals, excreta), regardless of how much living plant biomass it currently supports, the detritus food chain can always operate, even in conditions where a grazing food chain might struggle (e.g. in deep shade, or below the photosynthetic zone). …

Recall the chapter's explicit statement that the detritus food chain (unlike the grazing food chain) is present in all ecosys …

• Naming the grazing food chain instead, since it is the more commonly taught example — but the chapter specifically …