Question

what energy transformation happens when a tv is turned on?
electrical to nuclear
chemical to radiant
mechanical to thermal
electrical to radiant
about how much energy gets passed along to the next level each time an organism
is eaten?
100%
90%
10%
50%
which term best describes all the different species of plants, animals, and
microorganisms living together in a particular area?
organism
ecosystem
population
community

Explanation:

• For the first question: A TV uses electrical energy and produces radiant energy (light and sound). Electrical to nuclear is incorrect as there is no nuclear reaction. Chemical to radiant is wrong as no chemical reaction is involved in a TV's basic energy use. Mechanical to thermal is also incorrect.
• For the second question: According to the 10% rule in ecology, only about 10% of energy is passed to the next trophic level when an organism is eaten. 100% is impossible as energy is lost (e.g., in respiration, heat loss). 90% is too high as most energy is used by the organism itself. 50% is also not in line with the established ecological rule.
• For the third question: An organism is a single living being. An ecosystem includes the biotic (living) and abiotic (non - living) components. A population is a group of the same species. A community is all the different species of plants, animals, and microorganisms living together in a particular area.

Answer:

1. Electrical to radiant
2. 10%
3. community