1.5 Photosynthesis

Question 1

Factors that affect the rate of photosynthesis

Answer 1

1. Light intensity
2. Carbon dioxide levels
3. Chlorophyll levels

Question 2

Limiting factors

Answer 2

Those that restrict the rate of photosynthesis

1. Temperature
2. Carbon dioxide levels
3. Light intensity

Question 3

How to test a leaf for starch

Answer 3

1. Boiling water (remove waxy cuticle, destroy cell membrane and burst chloroplasts)
2. Boil in ethanol (removes the chlorophyll)
3. Water (to soften leaf)
4. Test with iodine

Question 4

Uses for glucose in a plant

Answer 4

1. To release energy via photosynthesis
2. To make cellulose for support
3. To convert into starch for storage
4. To make amino acids and build proteins