3.5.3

Question 1

Producers

Answer 1

Photosynthetic, making organic substances from light energy, water, CO2

Question 2

Consumers

Answer 2

Organisms that feed on other organisms

Question 3

Saprobionts

Answer 3

Break down dead organisms to release minerals

Question 4

Ways energy lost from the sun to plants

Answer 4

-90% of light reflected into space
-Not all wavelengths absorbed by plants
-Light misses chlorophyll
-Another factor limits the rate of photosynthesis
-1 to 3% of suns energy converted into organic matter

Question 5

Net production of consumers

Answer 5

=I-(F+R)

I=Chemical energy store in ingested food
F=Chemical energy lost to the environment in faeces and urine
R=Respiratory losses to the environment.

Question 6

Percentage efficiency

Answer 6

energy available after transfer/
energy available before transfer x100