Photosythesis

Question 1

Stomata

Answer 1

small holes on the underside of the leaf allowing for gas exchange

Question 2

Light Independent Reaction

Answer 2

(calvin cycle) produces glucose using CO2 from the air, ATP and reduced NADP from the LDR and the enzyme rubisco

Question 3

Rubisco

Answer 3

An enzyme used in the calvin cycle to catalyse the carboxylation of RuBP into 2x GP

Question 4

Light Dependent Reaction

Answer 4

Series of steps initiated by the absorption of light resulting in a net production of ATP and reduced NADP

Question 5

Photosystem I

Answer 5

system of carotenoids surrounding a reaction centre. Found mainly on the intergranal lamellae. Absorbs light at 700nm.

Question 6

Photosystem II

Answer 6

system of carotenoids surrounding a reaction centre. Almost exclusively on the grana. Absorbs light at 680nm.

Question 7

Cyclic photophosphorylation

Answer 7

Involves photosystem I only and only produces a small amount of ATP. Electrons recycled through ETC to pump H+ ions into thylakoid space from stroma. H+ ons then released back through ATP synthase by chemiosmosis.

Question 8

Non-cyclic Photophoshporylation

Answer 8

Involves both Photosystems I & II. electrons from photolysis of H2O passes through PSI into PSII and are eventually used to reduce NADP. H+ ions pumped in throught the photosystems are released by chemiosmosis through ATP synthase.

Question 9

Palisade cells

Answer 9

cells near the top side of the leaf containing lots of chloroplasts for photosynthesis

Question 10

Cuticle

Answer 10

layer on the top of the the leaf which helps to reduce water loss