In three sentences describe what would happen to the ecosystem if decomposers didnt exist on earth
Energy Flow: Energy Flow Unit Test (Unit 4, lesson 12)
1. What is the correct term for organisms that consume other organisms in order to gain matter and nutrients?
A: Heterotrophs
2. What is the major difference between the position of producers and primary consumers in the food chain?
B: Primary consumers make up the second level of the food chain, while producers make up the first level of the food chain.
3. As energy is passed through the food chain, some of the energy is lost as heat. What is the approximate amount of energy that is passed from one trophic level to the next?
B: 10 percent
4. In the image, which animal is a tertiary consumer?
D: lion
5. If 100,000 kJ of energy is available to the producers, how much energy is available to the secondary consumers in this food pyramid?
C: 1,000 kJ
6. The ultimate source of energy for most organisms is
B: the sun.
7. Which of the following is the best evidence that supports the rule that only 10% of energy is transferred from one organism to another?
C: There are fewer organisms at the top of the food chain because there is less energy available for life processes.
8. Read the following statement and choose the option that has the respective answers in the correct order.
“Chemical energy input converted from the sun occurs via __________ in plants or ingesting food in animals; this energy drives the flow of matter into and out of the cell. The chemical energy is inefficiently converted into usable energy by __________, because all the stored energy is not converted into ATP some of it is released into the ecosystem as ____________.”
C: photosynthesis; respiration; heat
9. Do both animal and plant cells have mitochondria? Why or why not?
Responses
C: Yes; they both need mitochondria for cellular respiration.
10. Chemosynthesis relies on which energy source?
B: chemical
***THE FOLLOWING QUESTIONS NEED TO BE GRADED***
11. Heterotrophs are organisms that consume other organisms in order to gain nutrients. Compare two different categories of heterotrophs in terms of how they obtain nutrients. Explain your answer in one to two sentences.
Answer: Herbivores feed on plants while carnivores feed on animal matter.
12. In 3–5 sentences, compare and contrast the flow of matter and energy for land-based ecosystems and marine ecosystems. How and why are they similar, and how and why are they different?
Answer: Both of the marine and land ecosystems feed on each other for energy. But in the land ecosystem, animals are divided into primary producers, primary consumers, secondary consumers, and tertiary consumers. While the marine ecosystem aren't divided into categories.
13. DDT was developed as a synthetic insecticide. In 1972, DDT was banned for use in the United States due to its damaging environmental effects. In 3-5 sentences explain how introducing DDT into an ecosystem would impact a food chain. Be sure to include all relevant vocabulary in your answer.
Answer: DDT is a synthetic insecticide that is highly toxic to many organisms, such as birds and fish. When DDT enters an ecosystem, it accumulates in the fatty tissues of organisms and is passed up the food chain. This means that the higher up the food chain an organism is, the more DDT it will have in its body. This can cause a decrease in the population of organisms higher up the food chain, as they are more likely to be affected by DDT. DDT can also cause reproductive problems in organisms, leading to a decrease in the population of organisms lower down the food chain. This can have a cascading effect on the entire food chain, leading to a decrease in biodiversity and a disruption of the balance of the ecosystem.
14. In three to five sentences, describe what would happen to ecosystems if decomposers did not exist on Earth.
Answer: Without the existence of decomposers, dead organisms would pile up everywhere. This would lead to a decrease in the availability of essential nutrients for other organisms, and an increase in the amount of waste that is in the environment. With would disrupt the balance of the ecosystem and lead to a decrease in biodiversity and an overall decrease in the health of the environment.
15. Photosynthesis cycles matter and energy in many environments. Explain how chemosynthesis cycles matter and energy in extreme environments. Explain your answer in 1-2 sentences.
Answer: Chemosynthesis cycles matter because they pass matter and energy from one organism to another when organisms are consumed. Chemosynthesis uses chemical energy instead of light energy to convert carbon or methane into organic matter.
My answers are correct because I just took the test.