B2.3 Photosynthesis Flashcards
How do green plants absorb light energy?
Using chlorophyll in their leaves
What is the process of photosynthesis?
Absorbing light, water, and carbon dioxide to create glucose for respiration
What factors can affect the rate of photosynthesis?
- Temperature
- Carbon dioxide presentation
- Light intensity
Explain the process of photosynthesis
Light is absorbed by chlorophyll in the chloroplasts of the cell
This light energy is used to convert co2 and water into glucose (and oxygen)
What are the uses of the glucose produced in photosynthesis?
Some is used for RESPIRATION
Other glucose is stored as STARCH (insoluble) to be used later for RESPIRATION
Glucose is also used to make:
- Cellulose (strengthen cell wall)
- Proteins (such as enzymes + chlorophyll)
How does temperature affect the rate of photosynthesis?
If the temperature is too low, the rate of photosynthesis slows down, however it also slows down if the temperature is too high
How can farmers control conditions in greenhouses to optimise the crop yield?
- Artificial, high light intensity lights can be used so plants can still photosynthesise in winter and in the dark
- Artificial heating allows photosynthesis to continue
- Additional carbon dioxide in the atmosphere
Why are paraffin lamps effective to be used in greenhouses?
They produce light, heat, and carbon dioxide for an efficient price as well
How do plants gain the nitrates they need to make proteins with glucose?
Nitrate ions are absorbed from the soil
What gas is needed for photosynthesis?
Carbon dioxide
What is the waste product of photosynthesis?
Oxygen
Why do plants need nitrate ions?
To make proteins
