11 Jun On a food web diagram, one type of fish is labeled
Question
1)On a food web diagram, one type of fish is labeled as a primary consumer, and another is labeled as a secondary consumer. What is the reason for this difference?
Secondary consumers are higher in the food web because they eat primary consumers.
Primary consumers are smaller fish but are at the same level in the food web as secondary consumers.
Secondary consumers eat primary producers, so they are lower in the food web.
Primary consumers eat secondary consumers, so they are lower in the food web.
2.)Some bacteria are decomposers, which fill an important role in the food web. What would happen to an ecosystem without decomposers?
All levels of the food web would be affected because it would be difficult to recover nutrients from dead matter and waste.
Primary producers would increase because of the excess nutrients available.
Consumers would be most affected because decomposers are the main source of energy entering the food web.
Autotrophs would take over the role of decomposers.
3)An orange roughy fish eats squid and small fish. It also is eaten by predators like dolphins and sharks. Where would the orange roughy most likely appear on a food web?
It is a primary producer because it provides food for the dolphins and sharks.
It is a tertiary consumer because most of the things it eats are secondary consumers.
It is a secondary consumer because it eats two types of things.
It is a primary consumer because it has both predators and prey.
4)Which trophic level is the starting point for energy entering the food web?
Decomposers
Primary consumers
Primary producers
Secondary consumers
5)An orange roughy fish is a fourth-level consumer that requires almost ten times the amount of food available from the primary producers in the ecosystem. Why isn’t more energy available from the primary producers?
Primary producers are not very efficient and lose most of their energy to the environment.
There is too much competition from other fourth-level consumers, leaving very little available to the orange roughy.
Only a fraction of energy is passed through each level, so there is less available to upper-level consumers.
The energy flow is unbalanced and tends to move toward the lower levels.
6)Which of the following is an example of a primary producer?
Worms
Clams
Plants
Bacteria
7)A Bluefin tuna eats a sardine that has recently been feeding on plankton. The sardine has 1,000 joules worth of energy, but the tuna ultimately gains only about 100 joules. Where does the rest of the energy go?
It is destroyed and cannot be recovered.
It is used for cell functions or transformed to heat energy.
It was used by the sardine as it tried to get away from the tuna.
It reverts back to the plankton that the sardine ate.
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