L6/7: Photosynthesis

Question 1

Photosynthesis

Answer 1

Light Absorption + Calvin Cycle. 2 results = 1) energy for metabolisms & 2) produce carbohydrates (sucrose)

Question 2

Photosynthesis-Irradiance

Answer 2

Positive correlation between light intensity and photosynthetic rate, but efficiency decreases gradually

Question 3

Diffusion

Answer 3

Movement of carbon from high concentration (outside leaf) to photosynthetic tissues (chloroplasts - inside leaf)

Question 4

Stomata

Answer 4

Pores which regulate gas diffusion

Question 5

Transpiration Rate

Answer 5

Flux of water escaping from leaf. Measured using Fick’s Law. Diffusion through layers of leaf (regulated by stomata)

Question 6

Stomatal Resistence + Conductance

Answer 6

Rate of passage of c02 entering, or water vapor exiting through the stomata. Influences turgor pressure and osmotic potential of guard cells.

Question 7

c02 fixation

Answer 7

Part of Calvin Cycle. Rubp binds to Rubisco + 1 carbon, reduction (using ADP + NADP). final product=glucose

Question 8

Photorespiration

Answer 8

Oxygen (rather than carbon) reacts with Rubp during fixation process. Results in unstable acid. Inefficiency.