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Before scientists understood the process of photosynthesis, they were at a loss to explain how plants could grow and increase their mass so dramatically from what appeared to be a steady diet of water. A 17th-century Flemish chemist named Jean Baptista van Helmont thought plants “extracted” the bulk of their food from soil (Van Helmont, 1841). Other scientists assumed plants gained their weight and size from carbon dioxide, while others assumed that water alone gave plants their heft.
None of these explanations, however, held up when tested experimentally. In test after test, mass loss by soil, water, and even carbon dioxide didn’t measure up to the mass gained by a growing plant. It wasn’t until Joseph Priestley’s experiments a century later that scientists began to suspect sunlight as the major contributor to a plant’s growth. – source
Quiz Questions
1. What are the products of photosynthesis?
A. Carbon dioxide and water
B. Glucose and oxygen (Correct Answer)
C. Lactic acid
2. What color is chlorophyll?
A. Black
B. Blue
C. Green (Correct Answer)
3.Where does photosynthesis take place?
A. In the chloroplasts (Correct Answer)
B. In the cell wall
C. In the nucleus
4. What are the reactants of photosynthesis?
A. Carbon dioxide and water (Correct Answer)
B. Carbon dioxide and oxygen
C. Glucose and oxygen
5. When do plants respire?
A. During the day only
B. During the day and night (Correct Answer)
C. During the night only
6. When do plants photosynthesis?
A. During the day and night (Correct Answer)
B. During the night only
C. During the day only
7. What are the cells near the top of levels called?
A. Palisade cells (Correct Answer)
B. Root hair cells
C. Red blood cells
8. What does xylem carry?
A. Water
B. Blood (Correct Answer)
C. Carbohydrates
9. What do stomata do?
A. Stop carbon dioxide diffusing into leaves
B. Allow oxygen to diffuse into leaves
C. Allow carbon dioxide to diffuse into leaves (Correct Answer)
10. How are root hair cells adapted?
A. Huge surface area (Correct Answer)
B. Lots of chloroplasts
C. Have no cell wall
Photosynthesis is a symbiotic relationship between plants and microorganisms and involves photosynthesis, which allows plants to use energy from the sun, and water exchange between the plants and the water in the soil. Photosynthesis requires carbon dioxide (CO 2 ), water (H 2 O), and a few other necessary elements. Plants release water into the soil to provide the microorganisms with the carbon and oxygen they need to grow. Microorganisms, in turn, use the carbon and oxygen to produce the sugars that they then transfer to the plants. This transfer of food from the microorganisms to the plants occurs over many years.
Water is a necessary element in the water exchange process because it is what the plants need to produce sugars and oxygen. The carbon dioxide is removed from the water when the plants are harvested. If the water was not present, the microorganisms would die
