Energy And Feeding Relationships

9.In a food chain, only 10% of energy is transferred from one trophic level to the next. If producers have 10000 kJ of energy, how much energy (in kJ) is available to secondary consumers?

10.Explain why there are usually no more than four trophic levels in a food chain.

11.Name the type of organism that gains its energy from waste organic material from all trophic levels.

12.Arrange the following organisms in the correct order of a food chain, starting with the producer.

13.In a four-level energy pyramid (producer, primary consumer, secondary consumer, tertiary consumer), which trophic level is represented by the top layer?

14.In an energy pyramid with producers, primary consumers and secondary consumers, name the trophic level that contains the most energy.

15.What is the principal source of energy for all food chains?

16.Which trophic level is occupied by primary consumers?

17.In a food chain, what do the arrows represent?

18.Which of the following is a reason why only about 10% of energy is transferred from one trophic level to the next?

19.Which of the following processes return carbon dioxide to the atmosphere? (Select all that apply)

20.Decomposers obtain energy from dead organic matter and return carbon to the atmosphere as carbon dioxide.

21.Match each trophic level with the correct description.

22.In an energy pyramid, which trophic level contains the most energy?

23.Match each process in the carbon cycle with its correct description.

24.Which of the following are ways that energy is lost from a food chain? (Select all that apply)

25.In a food web, if the population of a primary consumer decreases significantly, which of the following is most likely to happen?

26.Arrange the following processes in the correct order as they occur in the carbon cycle, starting with carbon dioxide in the atmosphere.

27.In a food chain, only about 10% of the energy from one trophic level is transferred to the next. If the producers in a grassland ecosystem have 50,000 kJ of energy available, how much energy (in kJ) is available to the tertiary consumers?

28.In an energy pyramid for a food chain in a forest, which trophic level contains the largest amount of energy?

29.Which of the following are reasons why only about 10% of energy is transferred from one trophic level to the next? (Select all that apply)

30.In a food web, the arrows represent the transfer of energy from one organism to another.

31.Match each organism with its trophic level.

32.In a food web, if the population of rabbits (primary consumers) decreases significantly, which of the following is most likely to happen in the short term?

33.Which of the following is a producer in the food chain: grass → grasshopper → frog → snake?

34.In a practical investigation, a student placed a known mass of grass in a sealed container with soil and a known mass of rabbits. After one week, the student measured the mass of the rabbits and the remaining grass. Which of the following best explains why the total mass of the rabbits plus grass decreased over the week?

35.A student wants to estimate the energy transfer efficiency from one trophic level to the next in a grassland ecosystem. Which of the following measurements would be necessary for the calculation? (Select all that apply)

36.In a food chain, the arrows point from the consumer to the producer.

37.Match each organism to its trophic level in the food chain: grass → grasshopper → frog → snake.

38.Arrange the following processes in the correct order to show how carbon from the atmosphere becomes part of a tertiary consumer, starting with carbon dioxide in the air.

39.In a food web, if the population of a top predator decreases significantly, which of the following is most likely to happen in the short term?

40.A student set up two sealed jars with identical amounts of grass and water. Jar A contained a rabbit; Jar B contained a snake. Both jars were placed in sunlight for one week. Which jar is likely to have the greater total mass of living organisms at the end of the week?

41.In a food chain, arrows point from the consumer to the producer.

42.Arrange the following processes in the correct order to show how carbon from the atmosphere becomes part of a secondary consumer, starting with carbon dioxide in the atmosphere.

43.In a food web, if the population of rabbits (primary consumers) decreases significantly, which of the following is most likely to happen in the short term?

44.The principal source of energy for all food chains is the Sun.

45.In a marine food chain, phytoplankton are eaten by zooplankton, which are eaten by small fish, which are eaten by large fish. If the biomass of phytoplankton is 5000 kg, what is the approximate biomass of small fish?

46.Which of the following are ways that energy is lost from a food chain, making it unavailable to the next trophic level? (Select all that apply)

47.In a food web, arrows point from the consumer to the producer.

48.Complete the sentence: The arrows in a food chain show the transfer of ___ from one organism to the next.

49.Name the processes in the carbon cycle:

50.Define the term 'producer'.

51.In an energy pyramid, name the trophic level that contains the least amount of energy.

52.Describe how the over-harvesting of one species could affect other organisms in a food web.