2024 · Q29
In an ecosystem why is the number of trophic levels of a food chain usually limited?
general-sciencebiotech-environment-science
- ALower trophic level has lesser energy than the higher trophic level
- BBecause of the loss of energy at each trophic level
- CHigher trophic level individual can control the lower ones more efficiently
- DLimited trophic level makes a food chain less vulnerable to parasites
Explanation
The IUCN Red List categories, from highest to lowest extinction risk, are: Extinct (EX), Extinct in the Wild (EW), Critically Endangered (CR), Endangered (EN), Vulnerable (VU), Near Threatened (NT), Least Concern (LC). Species with insufficient data are classified as Data Deficient (DD), which sits outside this hierarchy and ranks lower than Least Concern. Option B presents exactly this descending order of threat.