AP BIOLOGY

ECOLOGY

ENERGY FLOW AND PRIMARY PRODUCTION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
in an energy pyramid, which way does the energy transfer?
A
from top of the pyramid to the bottom
B
from the bottom of the pyramid to the top
C
all of these
D
none of these
Explanation: 

Detailed explanation-1: -Energy is transferred up the pyramid because each organism is consumed by the one above it. The amount of energy available decreases at each trophic level because the transfers are not 100% efficient as only 10% energy is transferred from one trophic level to another.

Detailed explanation-2: -The bottom and largest level of the pyramid is the producers and contains the largest amount of energy. As you move up the pyramid, through the trophic levels to primary, secondary and tertiary consumers, the amount of energy decreases and the levels become smaller.

Detailed explanation-3: -In Summary: Energy Flow through Ecosystems Organisms in an ecosystem acquire energy in a variety of ways, which is transferred between trophic levels as the energy flows from the bottom to the top of the food web, with energy being lost at each transfer.

Detailed explanation-4: -Ecological pyramids begin with producers on the bottom (such as plants) and proceed through the various trophic levels (such as herbivores that eat plants, then carnivores that eat flesh, then omnivores that eat both plants and flesh, and so on). The highest level is the top of the food chain.

Detailed explanation-5: -Energy Flow Through an Ecosystem Secondary and tertiary consumers, omnivores and carnivores, follow in the subsequent sections of the pyramid. At each step up the food chain, only 10 percent of the energy is passed on to the next level, while approximately 90 percent of the energy is lost as heat.

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