Chapter 2- Photosynethesis

Question 1

Photophosphorylation

Answer 1

An endergonic reaction bonding a phosphate ion to a molecule of ADP using energy from light, making ATP

Question 2

Absorption spectrum

Answer 2

A graph showing how much light is absorbed at different wavelengths

Question 3

Action Spectrum

Answer 3

A graph showing the rate of photosynthesis at different wavelengths

Question 4

Antenna complex

Answer 4

An array of protein and pigment molecules in the thylakoid membranes of the grana that transfer energy from light of a range of wavelengths to chlorophyll a, at the reaction centre.

Question 5

Cyclic photophosphorylation

Answer 5

ATP can be produced by electrons that take a cyclical pathway and are recycled back into chlorophyll A in PSI

Question 6

Non-cyclic photophosphorylation

Answer 6

ATP can be produced by electrons that take a linear pathway from water, through PSII and PSI to NADP, which they reduce

Question 7

The Z scheme

Answer 7

The pathway taken by electrons in non-cyclic photophosphorylation

Question 8

Photolysis

Answer 8

The splitting of water molecules by light, producing hydrogen ions, electrons and oxygen

Question 9

Limiting factor

Answer 9

A factor that limits the rate of a physical process by being short in supply. An increase in a limiting factor increases the rate of the process

Question 10

Light compensation point

Answer 10

Sometimes just called compensation point, the light intensity at which the plant has no net gas exchange as the volume of gases used and produced in respiration and photosynthesis are equal