energy transfers in eco systems pt.2

Question 1

what do consumers also store

Answer 1

chemical energy in their biomass

Question 2

how do consumers get energy

Answer 2

Consumers get energy by ingesting plant material, or animals that have eaten plant material.

Question 3

not all the chemical energy stored in the consumers food is transferred to____

Answer 3

o the

next trophic level — around 90% of the total available energy is lost in various ways.

Question 4

not all the food is eaten,plants bones and roots for examples what does this mean

Answer 4

not all the energy is taken in

Question 5

what happens to the parts that are ingested

Answer 5

• Some are indigestible, so are egested as faeces.
The chemical energy stored in these parts is therefore lost to the environment.

• Some energy is also lost to the environment through respiration or excretion of urine.

Question 6

what happens to the energy left

Answer 6

stored in the consumers’ biomass and is ; Remember, when production’ ‘
available to the next trophic level.

This energy is the consumers’ net production,

Question 7

what formula works out net production

Answer 7

N = I - ( F + R)

Question 8

what do the letters
N

I

F

R

stand for

Answer 8

N = Net production

I = Chemical energy in
ingested food

F = Chemical energy lost in faeces and urine

R = Energy lost through respiration

Question 9

what can the net production of consumers also be called

Answer 9

secondary pro duction (or secondary productivity when

it’s expressed as a rate).