B2.3 Photosynthesis

Question 1

What is the word equation for photosynthesis?

Answer 1

carbon dioxide+water—(light energy)—->glucose+oxygen

Question 2

What happens during photosynthesis? (3 points)

Answer 2

• Light energy is absorbed by chlorophyll (inside chloroplasts
• Energy converts carbon dioxide (from the air) and water (from the soil) into glucose (sugar)
• Oxygen is released as a by-product

Question 3

3 limiting factors of photosynthesis

Answer 3

• Carbon dioxide
• Light intensity
• Temperature

Question 4

What is glucose converted into and why?

Answer 4

Insoluble starch, for storage

Question 5

Give four uses of glucose in plants

Answer 5

• Respiration
• To produce:
  
  • fats/oils for energy stores
  • cellulose
  • proteins

Question 6

Name 2 minerals (both ions) found in soil and state their uses

Answer 6

Nitrate ions = for making amino acids; needed to make proteins
Magnesium ions = for making chlorophyll

Question 7

What are the symptoms of deficiencies in the two mineral ions?

Answer 7

Nitrate deficiency = stunted growth (and yellow leaves)

Magnesium deficiency = yellow leaves