NEET · Biology · Ecosystem doubts
10 doubts found
Why are natural food chains usually limited to just four or five trophic levels?
Energy transfer between trophic levels is very inefficient -- only about 10% of the energy at one level is captured by the next, the rest lost as heat and respiration.
A pyramid of numbers for one big tree with many insects and birds is inverted, yet its energy pyramid is upright. Why?
A pyramid of numbers counts individuals, so one large tree supporting thousands of insects gives an inverted shape.
What does “Ten per cent law” actually mean in Ecosystem, and why does it matter for NEET?
only about 10% of the energy at one trophic level is passed on to the next; the rest is lost as heat and in respiration.
I keep getting “Ten per cent law” questions wrong in Ecosystem. What's the trap?
thinking most of the energy moves up to the next level.
What does “Ecological pyramids” actually mean in Ecosystem, and why does it matter for NEET?
pyramids of energy are always upright, but pyramids of number or biomass can be inverted.
I keep getting “Ecological pyramids” questions wrong in Ecosystem. What's the trap?
assuming every ecological pyramid is upright.
What does “Population interactions” actually mean in Ecosystem, and why does it matter for NEET?
mutualism benefits both (+/+), competition harms both (-/-), predation and parasitism help one and harm the other (+/-), and commensalism helps one while the other is unaffected (+/0).
I keep getting “Population interactions” questions wrong in Ecosystem. What's the trap?
mixing up commensalism and mutualism.
What is the difference between food chain and food web?
A food chain is a single linear who-eats-whom path; a food web is many interlinked chains, which gives an ecosystem stability because alternative food routes exist.
How is Ecosystem tested in NEET, and what should I focus on?
Prioritise the core ideas: Ten per cent law, Ecological pyramids, Population interactions.