Photosynthesis

Question 1

Describe structure of chloroplasts

Answer 1

Outer and inner membrane

Inside the inner membrane there is a system of membranes in stacks called grana

Single granum made of membrane discs called thylakoids

Grana are joined by lamellae, which are extensions of thylakoid membranes

The lamellae act as a skeleton within chloroplast to maintain working distance

Stroma is the fluid matrix in the chloroplast and contains all necessary enzymes

Question 2

Chlorophyll

Answer 2

Is the light capturing photosynthetic pigment and is mixture of closely related pigments

Chlorophyll a, Chlorophyll b, Chlorophyll carotenoids, Phaeophytin

Each pigment absorbs and captures light from particular areas of spectrum

Far more energy from light can be used than if there were only one pigment

Question 3

Absorption Spectrum

Answer 3

Graph of amount of light absorbed by pigment against the wavelength of the light

Question 4

Action spectrum

Answer 4

Graph demonstrating rate of photosynthesis against different wavelength of light

Question 5

Photosystem I

Answer 5

Combination of pigments, which absorbs light of wavelength 700nm(red)

Involved in cyclic and non-cyclic photophosphorylation

PSI particles are found on intergranal lamellae

Question 6

Photosystem II

Answer 6

Combination of pigments, which absorbs light of wavelength 680nm

Involved only in non-cyclic photophosphorylation

PSII particles found on grana itself