18 Questions
What is the main process through which plants produce glucose?
Photosynthesis
Where do animals get glucose from?
From their food
What happens to glucose during cellular respiration?
It becomes carbon dioxide and water
Where can remains from plants and animals be stored for a long time without decomposing completely?
Marshes
What are coal, oil, and natural gas classified as?
Organic fuels
What happens when fossil fuels are burned?
Carbon dioxide is emitted into the air
What percentage of the Earth's water is salt water?
98%
Which of the following is NOT a form of precipitation mentioned in the water cycle?
Fog
What is the process by which water vapor in the atmosphere condenses into tiny droplets, forming clouds?
Condensation
If the Earth were shrunk to the size of an apple, how deep would the oceans be compared to the apple's skin?
Shallower than the apple's skin
What is the term used to describe the water that is not salt water?
Sweet water
Which of the following processes is NOT part of the water cycle?
Nitrogen fixation
What is the primary source of carbon atoms used by plants to produce glucose during photosynthesis?
Atmospheric carbon dioxide
What is the primary reason for the recent rapid increase in atmospheric carbon dioxide levels?
Burning of fossil fuels over a short period
Which of the following statements about Earth's water resources is true according to the text?
Earth's water resources are limited despite the vast oceans
What is the process by which decomposers, such as fungi and bacteria, contribute to the carbon cycle?
Cellular respiration
Which of the following is NOT a fossil fuel mentioned in the text?
Propane
What is the primary reason why some plant and animal remains do not decompose completely?
Both lack of oxygen and low temperature
Study Notes
Carbon Cycle
- 0.039% of air is carbon dioxide.
- Carbon atoms from carbon dioxide are used by plants to produce glucose through photosynthesis.
- Glucose is used as fuel by cells in plants and animals through cellular respiration, producing carbon dioxide and water as byproducts.
- Carbon dioxide is returned to the air through cellular respiration and decomposition of dead plants and animals.
Fossil Fuels
- Dead plants and animals can be stored for long periods in places with limited oxygen, such as marshes and deep seabeds.
- Over time, these remains can become fossil fuels like coal, oil, and natural gas, which have been stored in the ground for millions of years.
- Burning fossil fuels releases a large amount of carbon dioxide into the air.
Water Cycle
- The water cycle, or hydrological cycle, is the continuous movement of water on, above, and below the Earth's surface.
- The cycle involves evaporation, condensation, precipitation, runoff, percolation, and surface storage.
- The water cycle is essential for distributing freshwater across the planet, sustaining life, and regulating climate patterns.
Water Facts
- If the Earth were the size of an apple, no ocean would be deeper than the apple's skin.
- 98% of the Earth's water is saltwater in the oceans, while 2% is freshwater.
- Most freshwater occurs as ice at the North and South Poles, with the rest forming lakes, rivers, and groundwater.
Nitrogen Cycle
- The nitrogen cycle is the process by which nitrogen is converted between its various chemical forms.
- The cycle involves nitrogen fixation, assimilation, ammonification, nitrification, and denitrification.
- Nitrogen is converted between atmospheric nitrogen, ammonia, nitrate ions, and other forms through the actions of bacteria, plants, and animals.
Test your knowledge about photosynthesis, cellular respiration, and the carbon cycle in plants and animals. Learn about how plants produce glucose from carbon dioxide and how both plants and animals utilize glucose as fuel.
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