AP BIOLOGY

ECOLOGY

ENERGY FLOW AND PRIMARY PRODUCTION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What is a trophic level?
A
Each level represented within a food chain or web.
B
Levels of ecosystems that the world is divided into.
C
Different levels of nutrients present within an organism.
D
The levels of sunlight an autotroph needs to survive.
Explanation: 

Detailed explanation-1: -The trophic level of an organism is the number of steps it is from the start of the chain. A food web starts at trophic level 1 with primary producers such as plants, can move to herbivores at level 2, carnivores at level 3 or higher, and typically finish with apex predators at level 4 or 5.

Detailed explanation-2: -Organisms in food webs are grouped into categories called trophic levels. Roughly speaking, these levels are divided into producers (first trophic level), consumers, and decomposers (last trophic level).

Detailed explanation-3: -The trophic levels are the positions of organisms on a food chain. They represents a step wise transfer of energy through food, in an ecosystem. The lowest level of a trophic level is occupied by producers. Producers are consumed by primary consumers i.e herbivores and they occupy the second trophic level.

Detailed explanation-4: -The first and lowest level contains the producers, green plants. The plants or their products are consumed by the second-level organisms-the herbivores, or plant eaters. At the third level, primary carnivores, or meat eaters, eat the herbivores; and at the fourth level, secondary carnivores eat the primary carnivores.

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