LA

(39) GCSE Biology Revision "Uses of Glucose from Photosynthesis"

Photosynthesis Overview

  • Definition: Photosynthesis is the process where carbon dioxide and water are chemically reacted using the energy from light.

  • Word Equation: Carbon Dioxide + Water + Light Energy → Glucose + Oxygen

Uses of Glucose in Plants

1. Energy Release in Respiration

  • Process: Glucose is used to release energy through respiration.

  • Location: Respiration takes place in the mitochondria.

  • Key Point: Photosynthesis occurs during the day, but respiration occurs both day and night.

2. Storage as Starch

  • Function: Glucose is converted into starch, an insoluble storage molecule.

  • Utilization: Starch can be converted back to glucose when needed, such as during the night.

3. Conversion to Fats and Oils

  • Example: Olive oil is a common storage form of energy in plants.

  • Purpose: Fats and oils serve as a long-term energy reserve for the plant.

4. Formation of Cellulose

  • Role: Cellulose, made from glucose, contributes to the strength of the plant cell wall.

  • Significance: Provides structural support to the plant.

5. Production of Amino Acids

  • Function: Glucose is used to produce amino acids, which are essential for protein synthesis in plants.

  • Source Requirement: Nitrate ions must be absorbed from the soil for amino acid production.

  • Nutritional Relevance: Foods like peas are good sources of plant proteins.