Question

A) The primary source of energy in most ecosystems is/are (1 point)
autotrophs.
heterotrophs.
the sun.
glucose
Answer
A) Which would be an autotroph in a grassland ecosystem? (1 point)
muskrat
mallard duck
monarch butterfly
prairie cordgrass
Answer
A) Which of the following best explains why there are fewer secondary consumers than
producers? (1 point)
More secondary consumers can absorb radiant energy from the sun.
Secondary consumers have less cell processes that need energy.
Heat energy given off from producers kills off primary and secondary consumers.
Around 10% of the energy is transferred to support the next trophic level.
Answer
A) Which trophic level ingests the most biomass in order to receive the energy they need?
(1 point)
primary consumers
tertiary consumers
producers
secondary consumers
Answer
A)
Wolves were reintroduced to Yellowstone National Park in 1995. They began to hunt the
abundant elk population, so elk numbers decreased. The elk carcasses provided food for other
predators, like foxes, coyotes, and bears, so all of their populations increased. Elk used to
overgraze on willow plants; now that willows are growing back, beaver numbers are increasing,
because they prefer the slow-moving water that willows cause.
Which of these species is a keystone species?
(1 point)
wolves
willows
elk
bears
Answered by GPT 3.5
The primary source of energy in most ecosystems is the sun.
Answered by GPT 3.5
Prairie cordgrass would be an autotroph in a grassland ecosystem.
Answered by GPT 3.5
Around 10% of the energy is transferred to support the next trophic level.
Answered by GPT 3.5
Primary consumers ingest the most biomass in order to receive the energy they need.
Answered by GPT 3.5
The correct answer is "wolves." Wolves are considered a keystone species in this scenario because their presence and hunting activities have a cascading effect on the entire ecosystem. By preying on elk, wolves indirectly benefit willow plants and subsequently support an increase in the beaver population.