6 - Plant Nutrition

Question 1

Define photosynthesis and state the function of chlorophyll

Answer 1

The process by which plants synthesize carbohydrates (1)
from raw materials (1)
using energy from light (1)
Chlorophyll transfers energy from light into energy for chemicals (1)
for the synthesis of carbohydrates (1)

Question 2

Outline the storage and use of carbohydrates in plants

Answer 2

• Starch as an energy store (1)
• Cellulose to build cell walls (1)
• Glucose used in respiration to provide energy (1)
• Sucrose for transport in the phloem (1)
• Nectar to attract insects for pollination (1)

Question 3

Explain the importance of magnesium and nitrate ions in plants

Answer 3

Magnesium ions are used to make chlorophyll (3)
Nitrate ions are used to make amino acids (3)