Photosynthesis

Question 1

Purpose of photosynthesis

Answer 1

Purpose is to make glucose. Glucose can be used for an immediate source of energy, stored by the plant as starch for later conversion, used as a. Chemical starting point for the synthesis of complex compounds.

Question 2

The origin of chloroplast

Answer 2

theory of endosymbiosis. Chloroplasts are descendants of Cyanobacteria (photosynthetic bacteria), that were engulfed by eukaryotic cells in ancient times and lived in a symbiotic relationship and progressively changed into chloroplast into the form as we see today.

Question 3

Evidence of endosymbiosis

Answer 3

Chloroplast have:

• own circular DNA
• ribosomes
• porins
• Double membrane

Question 4

Light dependent stage

Answer 4

Occurs in the grana. Light energy is trapped by chlorophyll, water is spilt and oxygen is produced as a waste product.

Question 5

Calvin cycle

Answer 5

Occurs in the stroma. Carbon dioxide is reduced to form glucose.

Question 6

Light dependent inputs and outputs

Answer 6

Inputs: nadp+, adp+Pi, water, light energy, chhlorophyll
Outputs: nadph, atp, oxygen gas

Question 7

Light independent inputs and outputs

Answer 7

Inputs: carbon dioxide, nadph, atp
Outputs: glucose, adp + Pi, nadp+

Question 8

Factors affecting rate of photosynthesis

Answer 8

Light intensity, carbon dioxide, temperature