Photosynthesis-Jody-Lee Pop

Question 1

What is photosynthesis?

Answer 1

Photosynthesis is the building up of carbohydrates(glucose) from carbon dioxide and water using radiant energy from the sun that is trapped by chlorophyll. Oxygen is released.

Question 2

What are the raw materials required for photosynthesis?

Answer 2

Carbon dioxide (from the atmosphere)
Water (from the soil)
Radiant energy (from the sun)
Chlorophyll (in chloroplasts of green plants)
Enzymes

Question 3

What are the products of photosynthesis?

Answer 3

Glucose (stored in plant as starch)

Oxygen (released into atmosphere)

Question 4

What are the phases of photosynthesis?

Answer 4

Light dependent phase (Light phase)

Light independent phase (Dark phase)

Question 5

Explain the process of the light dependent phase

Answer 5

> takes place in grana of chloroplasts
radiant energy (from the sun) absorbed by chlorophyll molecules in thylakoids
energy transformation takes place: radiants energy transformed into chemical energy

Question 6

Explain the process of photolysis

Answer 6

> Water molecules are split up into energy-rich hydrogen atoms (transferred to light independent phase) and oxygen atoms (released as gas into atmosphere)
Energy carrier ATP is formed (used again in light independent phase)

Question 7

What is ATP?

Answer 7

(Adenosine TRIphosphate)
> energy carrier in living cells
> large molecule made up of an adenosine molecule and three phosphate (P) molecules

Question 8

What happens to ATP?

Answer 8

> when energy is needed by a cell, ATP is broken down into ADP (adenosine DIphosphate) and a phosphate molecule and energy is released
when energy is released in a chemical reaction, it is used to form a bond between ADP and P to form ATP

ATP is formed in the light dependent phase and releases energy in the light independent phase