✓ Board-verified
Science · 2022 · 3 marks
CBSE 2022 · Region 4 · Set 1 · Q9
What are trophic levels ? Why are autotrophs considered to be at the first trophic level of all food chains ? State the reason for limited number of trophic levels in nature.
Marking-scheme solution
Every step or level of the food chain forms a trophic level.
Autotrophs are the green plants, which are the only organisms which can fix up the solar energy and make it available for heterotrophs or the consumers.
Very little amount of energy is available to the last trophic level as energy is lost at every level to the environment.
More from Our Environment
- Assertion: The amount of ozone in the atmosphere began to drop sharply in the 1980s. Reason (R): The oxygen…2025 · asked 3×
- Other than the abiotic components, which of the given biotic components are not required to make an aquarium…2025 · asked 3×
- Use of pesticides to protect our crops affect organisms at various trophic levels especially human beings.…2024 · asked 3×
- Plants → Deer → Lion In the given food chain, what will be the impact of removing all the organisms of second…2024 · asked 3×
- In accumulation of toxic substances at higher trophic levels of an ecosystem through the food chain, which of…2026 · asked 3×
- Differentiate between food chain and food web. In a food chain consisting of deer, grass and tiger, if the…2024 · asked 3×
- Assertion: Use of jute bags for shopping reduces pollution. Reason (R): Jute is biodegradable and its bag may…2025 · asked 3×
- The examples of natural and manmade (artificial) ecosystems are respectively2025 · asked 3×
CBSE Class 10 Science past-paper question from the 2022board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.