B8 Flashcards
What do plants use for their source of energy?
Light
How do plants produce food?
Photosynthesis
What type of reaction is photosynthesis?
Endothermic, energy is taken in
Where does photosynthesis take place?
Leaves
What do leaves contain?
Chloroplasts that contain chlorophyll which is a chemical that can absorb light energy
Word Equation for photosynthesis?
CO2 + H20 —-> C6H12O6 + O2
What happens as light energy increases?
Rate of photosynthesis increases
What are the limiting factors on photosynthesis?
Carbon dioxide
Light intensity
Temperature
Chlorophyll
What happens when light intensity reaches a point where it does not make photosynthesis increase ?
At this point something else is in short supply , for example carbon dioxide
How does chlorophyll effect the rate of photosynthesis?
Increase in chlorophyll increase in photosynthesis
How temperature effects the rate of photosynthesis?
Increase in temperature means an increase in photosynthesis , unless it is too hot as enzymes will denature
How carbon dioxide effects the rate of photosynthesis?
More CO2 more photosynthesis
What is glucose used for in plants?
- protein synthesis
- to release energy in respiration
- produce insoluble storage of starch molecule
- to make cellulose which gives the cell wall strength
What is cellulose made from ?
Glucose from photosynthesis
What is needed for protein to be made?
Nitrate ions from the soil aswell as glucose
Why can plants respire at night without light?
- insoluble storage molecule of starch
- starch can be converted back to glucose whenever the plant wants
How fats and oils are used in plants?
As storage form of energy
Where does respiration take place?
Mitochondria
Why farmers use greenhouses?
Increase the rate of photosynthesis as this increases the yield of crops they produce. To do this farmers light and heat there green houses . Also add CO2
What do some farmers use?
Oil burners as they release heat and CO2 at the same time.
