Topic 7- Photosynthesis Flashcards
0
Q
What are the raw materials of photosynthesis?
A
Carbon dioxide and water
1
Q
What is the word equation for photosynthesis?
A
Carbon dioxide+water(arrow)(on top of arrow-light energy and chlorophyll) glucose + oxygen
2
Q
How does the plant produce glucose and oxygen?
A
Chlorophyll and light
3
Q
What is converted into carbohydrates?
A
Carbon dioxide
4
Q
What is made first?
A
Glucose
5
Q
How is the glucose used in the plant?
A
May be broken down to release energy in respiration or converted into starch for storage or cellulose to make cell walls
6
Q
What is photosynthesis?
A
- a series of enzyme controlled reactions
- how plants make food
7
Q
What are the two stages of photosynthesis and describe them.
A
- Light reaction stage:
- light energy from the sun is trapped by chlorophyll in chloroplasts
- the ATP is synthesised from ADP + phosphate + energy
- some of the trapped energy is used to split water to give hydrogen and oxygen
- oxygen diffuses out of the cell
- hydrogen is carried to the second stage by a hydrogen acceptor - Carbon fixation
- the ATP and hydrogen produced in the light reaction stage are used to convert Carbon dioxide to glucose sugar
8
Q
What does the speed of plant growth depend on?
A
- The rate of photosynthesis process which is rarely at its maximum
- it can be slowed by shortage of any essential input
- light intensity, temperature and Carbon dioxide may all be limiting factors at different times of the year
- eg. On a sunny day in winter, temperature will be the limiting factor
