Question

1. what is one major difference between food webs and food chains?

a. food webs cross into more than one environment.
b. food webs show multiple connections among organisms.
c. food webs trace the source of energy all the way back to the sun.
d. food webs contain multiple consumers using a single energy source.

1. which of the following would be impacted the most in an ecosystem if the

decomposer population was greatly reduced?
a. predation in the environment would decrease.
b. nutrient recycling in the environment would decrease.
c. oxygen in the air of the environment would increase.
d. reproduction rates of the producers in the environment would increase.

1. a food web shows the interaction of organisms in an ecosystem.

which statement best describes the transfer of energy in a food web?
a. the amount of energy transferred at each trophic level is the same because
some is lost as heat.
b. the amount of energy transferred at each trophic level increases because
energy is conserved.
c. the amount of energy transferred in each trophic level increases because
the size of the organisms increases.
d. the amount of energy transferred at each trophic level is different in land
and marine ecosystems because the animals are different.

Explanation:

• Question 11: Food webs show multiple connections among organisms, while food chains are linear. So, the answer is B.
• Question 12: Decomposers recycle nutrients. If their population is reduced, nutrient recycling would decrease. So, the answer is B.
• Question 13: Energy transfer in a food web follows the 10% - 20% rule (most energy is lost as heat at each trophic level). So, the answer is A.

Answer:

1. B. Food webs show multiple connections among organisms.
2. B. Nutrient recycling in the environment would decrease.
3. A. The amount of energy transferred at each trophic level decreases because some is lost as heat.