Photosynthesis

• What is the process that plants use to trap light energy?

  Photosynthesis
• What type of reaction is photosynthesis?

  Endothermic reaction
• From where do seedlings obtain energy to grow?

  From light energy trapped by photosynthesis
• Where does photosynthesis take place in a plant?

  In the leaves
• What green chemical in leaves absorbs light energy?

  Chlorophyll
• What are the two main substances that plants take in for photosynthesis?

  Carbon dioxide and water
• What is produced as a byproduct of photosynthesis?

  Oxygen
• What is the word equation for photosynthesis?

  Carbon dioxide + water → glucose + oxygen
• What is the chemical formula for carbon dioxide?

  CO₂
• What is the chemical formula for water?

  H₂O
• What is the chemical formula for glucose?

  C₆H₁₂O₆
• What is the chemical formula for oxygen?

  O₂
• What happens to the rate of photosynthesis when light intensity is increased?

  The rate of photosynthesis increases
• What does it indicate if increasing light intensity increases the rate of photosynthesis?

  Light intensity was a limiting factor
• What happens when light intensity is increased beyond a certain point?

  The rate of photosynthesis levels off
• What is the second limiting factor when light intensity is no longer limiting?

  The level of carbon dioxide
• What happens to the rate of photosynthesis when carbon dioxide levels are increased?

  The rate of photosynthesis increases
• What does it indicate if increasing carbon dioxide levels increases the rate of photosynthesis?

  Carbon dioxide was a limiting factor
• What other factors can affect the rate of photosynthesis?

  Amount of chlorophyll and temperature
• How does the amount of chlorophyll affect photosynthesis?

  Less chlorophyll means lower photosynthesis rate
• How does temperature affect the enzymes involved in photosynthesis?

  Higher temperatures increase enzyme activity
• What happens to enzymes at very high temperatures?

  They denature and the rate falls
• What are the factors that affect the rate of photosynthesis?

  • Light intensity
  • Carbon dioxide levels
  • Amount of chlorophyll
  • Temperature
• What is the overall process of photosynthesis?

  1. Light energy is absorbed by chlorophyll
  2. Carbon dioxide and water are taken in
  3. Glucose and oxygen are produced
• What happens to the rate of photosynthesis when light intensity is low?

  • Rate of photosynthesis is zero
  • Plants need light to photosynthesize
• What is the relationship between light intensity and the rate of photosynthesis?

  • As light intensity increases, the rate increases
  • Eventually levels off when another factor limits it
• What is the relationship between carbon dioxide levels and the rate of photosynthesis?

  • As carbon dioxide levels increase, the rate increases
  • Eventually levels off when another factor limits it
• How does temperature affect the enzymes in photosynthesis?

  • Increased temperature speeds up enzyme activity
  • Very high temperatures cause denaturation
• What is the significance of chlorophyll in photosynthesis?

  • Chlorophyll absorbs light energy
  • Essential for the photosynthesis process