How do you calculate the adjusted amount of energy that is available to organisms that are one trophic level above producers?(1 point)

Question

gross primary productivity minus net primary productivity
gross primary productivity minus net primary productivity

net primary productivity plus gross primary productivity
net primary productivity plus gross primary productivity

net primary productivity plus amount of organic material used in respiration
net primary productivity plus amount of organic material used in respiration

gross primary productivity minus amount of organic material used in respiration

Answer 1

To calculate the adjusted amount of energy available to organisms that are one trophic level above producers, you would focus on the energy that remains after accounting for the energy used by producers for respiration.

The correct choice is:

gross primary productivity minus amount of organic material used in respiration.

This is because Gross Primary Productivity (GPP) represents the total amount of energy captured by photosynthesis, while the energy used in respiration is subtracted from this to determine what is actually available for growth and reproduction, known as Net Primary Productivity (NPP). The energy available to the next trophic level (herbivores or primary consumers) is thus derived from the NPP of the producers.

Answer 2

Methylmercury biomagnifies in an ecosystem, meaning its concentration __________ as it moves through each higher trophic level.(1 point)
Responses

equalizes
equalizes

decreases
decreases

increases
increases

does not change

Answer 3

The correct response is:

increases

Methylmercury biomagnifies in an ecosystem, which means that its concentration increases as it moves through each higher trophic level. This occurs because predatory species accumulate higher concentrations of methylmercury from their prey, leading to greater concentrations at higher trophic levels.

Answer 4

Scientists are looking to determine the primary productivity of a lake by analyzing its oxygen net primary productivity. How are scientists able to measure how much oxygen is used during a plant’s cellular respiration processes?(1 point)
Responses

by observing cellular respiration under the absence of light
by observing cellular respiration under the absence of light

by observing cellular respiration only when photosynthesis occurs
by observing cellular respiration only when photosynthesis occurs

by observing cellular respiration under bright light conditions
by observing cellular respiration under bright light conditions

by observing cellular respiration by studying biomagnification

Answer 5

The correct response is:

by observing cellular respiration under the absence of light

In the absence of light, photosynthesis does not occur, so any oxygen consumption measured during this time can be attributed solely to cellular respiration. This method helps scientists determine the amount of oxygen used by plants for respiration, allowing them to calculate net primary productivity in the lake ecosystem.

Answer 6

Energy transfer is inefficient between trophic levels because(1 point)
Responses

organisms within a trophic level are fully consumed.
organisms within a trophic level are fully consumed.

dead organisms and waste are recycled throughout the trophic levels.
dead organisms and waste are recycled throughout the trophic levels.

molecules are fully digested from each trophic level.
molecules are fully digested from each trophic level.

all organisms within a trophic level die.

Answer 7

The correct response is:

dead organisms and waste are recycled throughout the trophic levels.

Energy transfer between trophic levels is inefficient primarily because only a portion of the energy stored in organisms is passed on to the next trophic level. Much of the energy is lost as heat, used for metabolic processes, or is contained in dead organisms and waste that are not consumed by the next trophic level. This recycling of dead matter and waste contributes to the inefficiency of energy transfer in ecosystems.

Answer 8

A potential side effect of biomagnification of a toxin in an ecosystem is(1 point)
Responses

population decrease of a primary producer.
population decrease of a primary producer.

population increase in secondary predators.
population increase in secondary predators.

population increase of a primary producer.
population increase of a primary producer.

population decrease of a secondary predator.

Answer 9

The correct response is:

population decrease of a secondary predator.

Biomagnification can lead to increased concentrations of toxins in organisms at higher trophic levels, such as secondary predators. As these toxins accumulate, they can have harmful effects on health, reproduction, and survival, potentially leading to a decrease in the population of these secondary predators. This imbalance can cascade through the ecosystem, affecting other populations as well.