B8 - Photosynthesis

Question 1

word equation for photosynthesis

Answer 1

carbon dioxide + water ^(light) → glucose + oxygen

Question 2

chemical equation for photosynthesis

Answer 2

6CO₂ + 6H₂O ^(light) → C₆H₁₂O₆ + 6O₂

Question 3

Is photosynthesis exothermic or endothermic?

Answer 3

Endothermic, energy is transferred from light to the chloroplasts.

Question 4

Name the 4 factors that affect the rate of photosynthesis.

Answer 4

• carbon dioxide concentration
• light intensity
• temperature
• chlorophyll levels in leaf

Question 5

formula light intensity

Answer 5

light intensity = ¹⁄ _(distance)²

Question 6

Describe the relationship between light intensity and distance, what is this law called?

Answer 6

The inverse square law shows that light intensity is inversely proportional to the square of the distance

Question 7

define limiting factor

photosynthesis

Answer 7

The factor that limits the rate of photosynthesis

Question 8

List 5 ways plants use glucose.

Answer 8

• respiration
• converting into starch
• making amino acids
• making cellulose
• making lipids

Question 9

Why do plants convert glucose into starch?

Answer 9

For storage. Glucose is soluble in water, but starch is not. If glucose was used to store energy, it would affect osmosis.

Question 10

Why do plants use glucose to make amino acids?

Answer 10

For protein synthesis

Question 11

Why do plants use glucose to make lipids?

Answer 11

For storage

Question 12

Why do plants use glucose to make cellulose?

Answer 12

To strengthen cell walls