Question

prompt
use the model here to describe the transfer of matter and flow of energy from one trophic level to another within an ecosystem. all of the following must be addressed in your response to receive full credit:
a. discuss the transfer of biomass when one organism eats another. use your knowledge of digestion to discuss how food is broken down and used by the consumer.
b. explain what happens to the energy that is not transferred from one organism to another.
c. explain why there are typically fewer organisms at the top of an energy pyramid.
d. use specific numbers and calculations to support your explanation.
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Explanation:

Step1: Biomass transfer explanation

When one organism eats another, the biomass of the prey is ingested. During digestion, food is broken - down into smaller molecules. Enzymes in the digestive system break down proteins into amino acids, carbohydrates into simple sugars, and fats into fatty acids and glycerol. These nutrients are then absorbed by the consumer and used for growth, repair, and energy - production. Only a fraction of the ingested biomass is actually incorporated into the consumer's body, typically around 10 - 20% due to inefficiencies in digestion and metabolism.

Step2: Energy not transferred explanation

The energy that is not transferred from one organism to another is lost in several ways. Some energy is used by the organism for its own metabolic processes such as respiration, which releases heat as a by - product. This heat is dissipated into the environment and is no longer available for the next trophic level. Also, undigested food is excreted as feces, carrying away energy that is not absorbed by the consumer.

Step3: Fewer organisms at top explanation

There are typically fewer organisms at the top of an energy pyramid because of the low energy transfer efficiency between trophic levels. As only about 10 - 20% of the energy from one level is passed on to the next, a large amount of biomass and energy is required at lower levels to support a small number of organisms at higher levels. For example, if a primary producer has 1000 kcal of energy, the primary consumer that eats it may only receive 100 kcal (10% transfer), and the secondary consumer that eats the primary consumer may only receive 10 kcal. So, to support a large top - level predator, a vast amount of lower - level organisms is needed.

Step4: Numerical example

Suppose a grassland ecosystem has 10000 kg of grass (primary producers). If the primary consumers (e.g., rabbits) have an energy transfer efficiency of 10% from the grass, they can only support a biomass of 1000 kg. If the secondary consumers (e.g., foxes) have a 10% energy transfer from the rabbits, they can only have a biomass of 100 kg. And if the tertiary consumers (e.g., wolves) have a 10% transfer from the foxes, they can only have a biomass of 10 kg. This shows why there are fewer organisms at the top of the energy pyramid.

Answer:

Biomass transfer occurs with inefficiencies during digestion. Non - transferred energy is lost as heat and in feces. Fewer organisms are at the top of the energy pyramid due to low energy transfer efficiency, as demonstrated by numerical examples such as the 10% energy transfer between trophic levels in the grassland ecosystem example.