C4.2 Transfers of Energy and Matter (part 2)

All 13 questions and answers

1. A heterotroph that obtains nutrients from non-living organic matter by secreting digestive enzymes onto it and absorbing the products (external digestion)?

   Answer: Saprotroph

2. What term describes an organism's position in a food chain or food web?

   Answer: Trophic level

3. What is an organism that eats producers (a herbivore) called?

   Answer: Primary consumer

4. The process of converting atmospheric nitrogen gas (N₂) into ammonia (NH₃)?

   Answer: Nitrogen Fixation

5. The bacteria found in root nodules of legumes that perform nitrogen fixation?

   Answer: Rhizobium

6. The conversion of ammonia into nitrites (NO₂⁻) and then into nitrates (NO₃⁻)?

   Answer: Nitrification

7. The type of soil bacteria that perform nitrification in aerobic conditions?

   Answer: Nitrifying Bacteria

8. The process where nitrates are converted back into nitrogen gas, usually in waterlogged (anaerobic) soils?

   Answer: Denitrification

9. The process by which plants take up nitrates from the soil to build proteins?

   Answer: Assimilation

10. The average percentage of energy transferred from one trophic level to the next?

    Answer: About 10%

11. The scientific unit used to measure energy flow in a pyramid of energy?

    Answer: kJ m⁻² yr⁻¹

12. The main reason energy is lost between trophic levels (related to staying alive)?

    Answer: Cellular Respiration

13. Why do food chains rarely have more than 4 or 5 trophic levels?

    Answer: Energy Limitation

Play it as a class game

Play this set opens it in splycr, where you can host it for your class straight away. Hosting needs no account: put the room code on the projector, and students join from a phone with the code and their first name. Each question plays as multiple choice, and the three wrong options are other answers from the same set.

• Boss Battle
• Racer
• Kaboom
• Sabotage
• Throne
• Splycr
• Cryo
• Outbreak