Question 1

What is a primary link between photosynthesis and aerobic respiration?

Accepted Answer

The primary link between photosynthesis and aerobic respiration is carbon. Photosynthesis captures carbon dioxide from the atmosphere to produce glucose, while aerobic respiration breaks down glucose, releasing carbon dioxide back into the atmosphere.

Question 2

Transfer of energy through food chains or webs is very efficient,making a lot of energy available to organisms.

Accepted Answer

Energy transfer through food chains or webs is not very efficient, with typically only about 10% of the energy from one trophic level being passed to the next. This results in less energy being available to organisms at higher trophic levels.

Question 3

Thanks to concentrated efforts,nearly half of the waste produced by humans is now recycled.

Accepted Answer

The answer of Thanks to concentrated efforts,nearly half of the...

Question 4

The hydrosphere is the earth's intensely hot core,thick mantle composed mostly of rock,and thin outer crust.

Accepted Answer

The hydrosphere refers to all of Earth's water, including oceans, lakes, rivers, and water vapor, not its core, mantle, or crust.

Question 5

The form of nitrogen used by plants to produce various amino acids,proteins,nucleic acids,and vitamins is ____.

Accepted Answer

Nitrate ions are the form of nitrogen used by plants to produce various amino acids, proteins, nucleic acids, and vitamins.

Question 6

Ecological tipping points related to the earth's major natural systems are also called

Accepted Answer

Planetary boundaries refer to the limits within which humanity can safely operate to avoid destabilizing the Earth's major natural systems. Crossing these boundaries increases the risk of generating significant environmental changes.

Question 7

What is one major way in which humans harmfully impact the water cycle?

Accepted Answer

Overpumping of aquifers can lead to a decrease in groundwater levels, affecting the availability of water for both ecosystems and human use, and can also cause land subsidence and reduced water quality.

Question 8

Ammonia that is not taken up by plants may undergo ____.

Accepted Answer

The answer of Ammonia that is not taken up by...

Question 9

Carbon is a major component of ____.

Accepted Answer

Carbon is a fundamental element in organic compounds, which include all life forms and many substances derived from living things.

Question 10

Although tropical rain forests are only about 2% of the earth's land surface,they contain about 50% of the world's land plant and animal species.

Accepted Answer

Tropical rainforests are incredibly biodiverse. Despite covering a small fraction of the Earth's surface, they are home to a significant portion of the world's biodiversity, including about half of the world's plant and animal species. This is due to the warm, wet climate that supports a wide variety of life.

Question 11

While the troposphere is 11 miles thick above sea level at the tropics,it is only four miles thick above the North and South poles.

Accepted Answer

The thickness of the troposphere varies with latitude; it is thicker in the tropics, up to about 11 miles, and thinner at the poles, about 4 miles thick, due to differences in temperature.

Question 12

Which statement about water is true?

Accepted Answer

Water has a wide liquid temperature range, from 0°C (32°F) at its freezing point to 100°C (212°F) at its boiling point under standard atmospheric pressure, allowing it to exist as a liquid over a wide range of temperatures.

Question 13

A group of different species living in a particular place,and potentially interacting with each other is called a population.

Accepted Answer

A group of different species living in a particular place and potentially interacting with each other is called a community. A population refers to individuals of the same species living in a particular area.

Question 14

The use of transmitters and GPS systems are very important in the study of ____.

Accepted Answer

Transmitters and GPS systems are crucial in tracking the movements and behaviors of endangered species, helping researchers monitor their populations, migration patterns, and habitat use. This technology is key in conservation efforts.

Question 15

Methane,CO₂,and water vapor make up about 30% of the earth's troposphere.

Accepted Answer

Methane, carbon dioxide (CO2), and water vapor are significant greenhouse gases, but they do not make up about 30% of the Earth's troposphere. The troposphere is primarily composed of nitrogen (about 78%) and oxygen (about 21%), with these greenhouse gases making up a much smaller percentage.

Question 16

Nitrogen gas,the major component of the atmosphere,cannot directly be used by plants and animals.

Accepted Answer

Plants and animals cannot directly use atmospheric nitrogen gas (N2) because they lack the necessary enzymes to convert it into a biologically usable form. Instead, nitrogen must first be fixed into compounds such as ammonia or nitrate through natural processes or human intervention before it can be utilized by living organisms.

Question 17

Gross primary productivity (GPP)is the biomass produced by photosynthesis minus the rate at which biomass is used for aerobic respiration.

Accepted Answer

Gross primary productivity (GPP) is the total amount of biomass produced by photosynthesis, without subtracting the biomass used for aerobic respiration. Net primary productivity (NPP) is calculated by subtracting the rate at which biomass is used for aerobic respiration from GPP.

Question 18

The reason we observe a "pyramid" of energy flow instead of an energy flow "cube" is because the low ecological efficiency of biological systems limits the numbers of organism in the higher trophic levels.

Accepted Answer

Energy is lost at each trophic level due to factors like metabolic processes and heat loss, leading to less energy available for higher trophic levels, thus creating a pyramid shape of energy flow rather than a cube.

Question 19

Scientists have less than ____ percent of the ecological data they need to evaluate the ecosystems in the United States.

Accepted Answer

The answer of Scientists have less than ____ percent of...

Question 20

Humans intervene in the nitrogen cycle in several ways.Which of the following is one of those ways?

Accepted Answer

The answer of Humans intervene in the nitrogen cycle in...

Quiz 3: Ecosystems: What Are They and How Do They Work