Photosynthesis in Plants

Overview

• Photosynthesis is essential for plant growth and survival.
• Takes place in leaves, specifically in chloroplasts.
• Chlorophyll, a pigment in chloroplasts, absorbs light (energy packets).

Photosynthesis Process

• Converts carbon dioxide (CO2) and water (H2O) into glucose and oxygen (O2).
• Chemical equation: 6 CO2 + 6 H2O → C6H12O6 + 6 O2.
• Light energy is required, making it an endothermic reaction.
  • Energy is transferred from the environment to chloroplasts by light.

Source of Reactants

• Carbon dioxide diffuses into leaves through stomata.
• Water absorbed from soil through roots and transported via xylem.

Products and Their Importance

• Glucose: Main product essential for several plant functions.
  • Cellular Respiration: Breaks glucose to release energy.
  • Cellulose Production: Combines glucose to strengthen cell walls.
  • Starch Production: Stored form of glucose, insoluble, compact, used for long-term storage.
    • Stored as a reserve for times when photosynthesis is less active (e.g., night, winter).
  • Amino Acids Production: Combines glucose with nitrate ions from soil to make proteins.
  • Production of Oils and Fats: Stored for future energy, especially in seeds.

Photosynthesis Rate Factors

• Growth rate depends on photosynthesis rate.
• Factors affecting rate include:
  • Light intensity
  • Temperature
  • Carbon dioxide concentration
  • Amount of chlorophyll

Additional Resources

• Find more educational videos, questions, flashcards, and study tools on Cognito's website.
• Track study progress with Cognito's resources.