How do plants recycle carbon during photosynthesis? (1 point)
• The carbon in glucose is recycled during photosynthesis.
• The carbon in carbon dioxide is recycled during photosynthesis.
• The carbon in water is recycled during photosynthesis.
• The carbon in oxygen molecules is recycled during photosynthesis
• The carbon in carbon dioxide is recycled during photosynthesis.
The correct answer is:
• The carbon in carbon dioxide is recycled during photosynthesis.
During photosynthesis, plants take in carbon dioxide from the atmosphere and convert it into glucose, a type of sugar. This process occurs in the chloroplasts of plant cells, specifically in the green pigment called chlorophyll. Carbon dioxide is broken down into carbon and oxygen, and the carbon is used to build glucose molecules. The oxygen is released back into the atmosphere as a byproduct of photosynthesis. Therefore, the carbon in carbon dioxide is recycled and transformed into glucose during photosynthesis.
The correct answer is: The carbon in carbon dioxide is recycled during photosynthesis.
During photosynthesis, plants use the energy from sunlight to convert carbon dioxide (CO2) and water (H2O) into glucose (C6H12O6) and oxygen (O2). The carbon in carbon dioxide is essentially "captured" by plants and used to build glucose molecules. This process is known as carbon fixation.
To understand this concept, let's break it down step by step:
1. Plants have specialized structures called chloroplasts, which contain a green pigment called chlorophyll. Chlorophyll absorbs sunlight energy.
2. Light energy from the sun is absorbed by the chlorophyll, which initiates a series of chemical reactions within the plant.
3. During photosynthesis, plants take in carbon dioxide from the air through small pores on their leaves called stomata.
4. The absorbed sunlight energy, along with enzymes and other cellular components, helps convert the carbon dioxide molecules into glucose.
5. The hydrogen atoms from water molecules, which are also taken in by the plant through its roots, are combined with the carbon dioxide to form glucose. Oxygen gas is released as a byproduct through the stomata.
6. Glucose is a sugar molecule that contains carbon, hydrogen, and oxygen atoms. It serves as an energy source for the plant and is also used to build other complex organic molecules like cellulose.
7. The plant can then break down the glucose molecules through a process called cellular respiration, releasing the stored energy for its metabolic processes.
8. This ongoing cycle of capturing and releasing carbon dioxide through photosynthesis and respiration allows the plants to recycle carbon within their systems.
In summary, photosynthesis allows plants to recycle carbon by converting carbon dioxide into glucose through the absorption of sunlight energy.
How do plants recycle hydrogen during cellular respiration? (1 point)
• The hydrogen in glucose is recycled when water is formed.
• The hydrogen in water is recycled when glucose is formed.
• The hydrogen in glucose is recycled when hydrogen gas is formed.
• The hydrogen in hydrogen gas is recycled when glucose is formed.
• The hydrogen in glucose is recycled when water is formed.
How many molecules of water are recycled when one molecule of glucose is created during photosynthesis? (1 point)
6 molecules of water are recycled when one molecule of glucose is created during photosynthesis.
Scientists used radioactive hydrogen to make water. They grew plants using the radioactive water. What happened to the radioactive hydrogen during photosynthesis? (1 point)
• It was recycled when ligh energy was formed.
• It was recycled when water was formed.
It was recycled when hydrogen gas was formed.
It was recycled when glucose was formed.