Topc 11: Photosynthesis

Question 1

Adaptations of leaves for photosynthesis

Answer 1

1. Large surface area - to absorb light
2. Minimal overlapping - to avoid shadowing
3. Being thin - short diffusion distance
4. Transparent cuticle and epidermis - allow light to enter leaves
5. Chloroplast- packed mesophyll cells - carry out photosynthesis
6. Stomata - for gas exchange
7. Xylem and phloem - transport reactants and products of photosynthesis between the leaves and the rest of the plant

Question 2

What are the 3 main stages of photosynthesis ?

Answer 2

1. Capturing light energy
2. Light-dependent reaction
3. Light-independent reaction

Question 3

What I are the 2 main roles of chloroplasts?

Answer 3

1. To absorb light energy to drive photosynthesis
2. To convert light energy into chemical energy