4.2 ENERGY FLOW

Question 1

Energy Flow

Answer 1

Chemical energy in carbon compounds flows through food chains by means of feeding

Question 2

Trophic level

Answer 2

The feeding level in a food web defined by the number of
energy transfers away from the original source of energy

Question 3

Food chain

Answer 3

shows the linear feeding relationships between species in a community

Question 4

Food web

Answer 4

A complex arrangement of interrelated food chains illustrating the flow of energy between
interdependent organisms

Question 5

how is energy lost?

Answer 5

Biomass not absorbed
Biomass not eaten
Heat

Question 6

Biomass not eaten

Answer 6

The chemical energy stored in parts of the organism that are
eaten (i.e. bones and feathers) does not pass to next trophic
level

Question 7

Biomass not absorbed

Answer 7

Not all of the eaten biomass is absorbed by the consumer’s
body. Some of the biomass is egested (pooped).

Question 8

Heat

Answer 8

Produced during cellular respiration and other metabolic reactions of the organisms in the trophic
level. Once produced, thermal energy is lost as heat to the surroundings.

Question 9

Energy conversion

Answer 9

The process where there is a change in energy from one form to another.

Question 10

The chemical energy produced by an organism can be converted into…

Answer 10

Kinetic energy (e.g. during muscular contractions)

Electrical energy (e.g. during the transmission of nerve impulses)

Light energy (e.g. producing bioluminescence)

Question 11

Energy pyramids

Answer 11

a graphical representation of the amount of energy at each trophic level of a food chain

kJ / m(squared) x year