B1.4.1 Photosynthesis

Question 1

Photosynthesis word equations

Answer 1

Carbon dioxide + water = glucose + oxygen

Question 2

Photosynthesis symbol equation

Answer 2

6CO2+6H2O=C6H12O6+6O2

Question 3

How do plants obtain carbon dioxide and water?

Answer 3

C02- diffuses from the air into the plant through the stomata
H20- enters the roots from the soil through root hair cells via osmosis

Question 4

What is the first of the two main stages of photosynthesis reactions?

Answer 4

Energy transferred from light splits water molecules into oxygen gas and hydrogen ions

Question 5

What is the second of the two main stages of photosynthesis

Answer 5

Carbon dioxide combines with the hydrogen ions to form glucose

Question 6

What kind of reaction is photosynthesis

Answer 6

Endothermic. Energy must be transferred from the surroundings to keep it going

Question 7

State three ways plants use glucose:

Answer 7

• In respiration
• to convert into other sugar molecules
• to convert into starch, a store of energy

Question 8

Compare the processes respiration and photosynthesis (4/5)

Answer 8

Respiration: Releases energy by breaking down glucose using oxygen.
Occurs in mitochondria.
Reactants: glucose and oxygen.
Products: carbon dioxide, water, and ATP.
• Photosynthesis:
Produces glucose using carbon dioxide, water, and sunlight.
Occurs in chloroplasts.
Reactants: carbon dioxide, water, and sunlight.
Products: glucose and oxygen.
Both processes are essential for life but have opposite reactions and occur in different cellular organelles.