Question

1. about 10 percent of the energy at any given trophic level is

a. used for metabolic processes.
b. available for the next higher trophic level.
c. given off as heat to the environment.
d. used by producers such as plants to make food.

1. higher trophic levels tend to have

a. larger organisms.
b. more organisms.
c. more biomass.
d. two of the above

Explanation:

Question 5

• Option a: Metabolic processes use energy, but the 10% rule is about energy transfer to the next trophic level, not just metabolic use.
• Option b: The 10% rule states that approximately 10% of the energy at one trophic level is available to the next higher trophic level (the rest is lost as heat, used in metabolism, etc.). This matches the 10% energy transfer concept.
• Option c: Most energy is given off as heat, but that's more than 10% (around 90% is lost as heat/metabolism), so this is incorrect.
• Option d: Producers make food via photosynthesis, which is not related to the 10% transfer between trophic levels.

• Option a: Higher trophic level organisms (e.g., top predators) often tend to be larger (though not always, but this is a common trend).
• Option b: Higher trophic levels have fewer organisms (pyramid of numbers), so this is incorrect.
• Option c: Higher trophic levels have less biomass (pyramid of biomass), so this is incorrect.
• Option d: Since b and c are incorrect, only a is correct, so "two of the above" is wrong.

Answer:

b. available for the next higher trophic level.

Question 6