A) When a consumer eats a producer, 10 percent of the producer’s energy is passed on to the
consumer trophic level. What happens to the other 90 percent? (1 point)
It is added back to the soil by decomposers.
It is used for cell processes or released as heat.
It is consumed and used by the consumer.
It is used by the producer to pass on to the next trophic level
B) It is used for cell processes or released as heat.
A) Why is there less biomass at the top of the energy pyramid? (1 point)
Secondary and tertiary consumers are larger, so there are fewer of them.
Secondary and tertiary consumers live longer, so there are fewer of them because they
reproduce more slowly.
Secondary and tertiary consumers have bigger ranges, so there are fewer of them because they
each need a lot of space.
Secondary and tertiary consumers have to consume a lot more food to support themselves, so
there are fewer of them.
D) Secondary and tertiary consumers have to consume a lot more food to support themselves, so there are fewer of them.
A)
Using the ten percent rule, determine how many kilocalories of energy the tertiary consumer
tuna will receive.
Algae Shrimp Lantern Fish Tuna
135,000 Kcal
(1 point)
1,350 Kcal
135,000 Kcal
13,500 Kcal
135 Kcal
Using the ten percent rule, the tertiary consumer tuna will receive 13,500 Kcal of energy.
A) Read the following statements about various species of plants and animals. Based on these
statements, which one would most likely be classified as an invasive species? (1 point)
Species D, native to Eurasia, has been released in various American states to combat the
invasive plant, purple loosestrife.
Species C, a plant from Japan, was introduced as a foliage crop and to reduce soil erosion. It
grows up to a foot per day, smothering low-growing plants and killing trees.
Species B is from Europe and can sting people. This species is often farmed in America for their
ability to pollinate and provide honey.
Species A is a plant from Eurasia. It is often considered a weed by homeowners and killed off by
using an herbicide. This plant can be consumed in salads or as a tea and is the first food
resource for bees in the spring.
Based on the statements provided, Species C, a plant from Japan, would most likely be classified as an invasive species.
A)
Use the following formula to find the efficiency of energy transfer between the harbor seal
(2,500 Kcal) and a polar bear (375 Kcal).
(1 point)
× 100
(Energy level transfered to next level)
(Total energy input)
20%
15%
10%
12%
To find the efficiency of energy transfer between the harbor seal and the polar bear, we use the formula:
Efficiency = (Energy level transferred to next level / Total energy input) × 100
Using the given energy values:
Efficiency = (375 Kcal / 2,500 Kcal) × 100
= (0.15) × 100
= 15%
Therefore, the efficiency of energy transfer between the harbor seal and the polar bear is 15%.