1.4.2 Factors Affecting Photosynthesis

• Light intensity increases the rate of photosynthesis indefinitely.

  False
• Higher carbon dioxide concentration always increases photosynthesis rate.

  False
• As light intensity increases, the rate of photosynthesis increases because more light energy is available for the plant to use in the photosynthesis process.
• Match the factor with its effect on photosynthesis:

  Light Intensity ↔️ Increases rate up to a certain point

  Carbon Dioxide Concentration ↔️ Increases rate until limited by other factors

  Temperature ↔️ Increases rate up to optimal level, then decreases

  Water Availability ↔️ Increases rate if adequate, decreases if limited
• Light intensity increases the rate of photosynthesis indefinitely.

  False
• Limited water availability decreases the rate of photosynthesis.

  True
• Moderate light intensity continues to increase the rate of photosynthesis up to a certain point.


  True
• Low carbon dioxide concentration increases the rate of photosynthesis.


  True
• Low temperatures reduce enzyme activity and decrease photosynthesis rate.


  True
• Higher light intensity increases the rate of photosynthesis.

  True
• What is the primary role of light intensity in photosynthesis?

  Increases photosynthesis rate
• What happens to the rate of photosynthesis when light intensity is moderate?

  Continues to increase
• High light intensity alone guarantees a high rate of photosynthesis.

  False
• What is the role of carbon dioxide in photosynthesis?

  Essential reactant
• What happens to the rate of photosynthesis when carbon dioxide concentration is high?

  Reaches a plateau
• Moderate temperatures increase the rate of photosynthesis by enhancing the activity of enzymes
• Photosynthesis is the process where plants convert sunlight, carbon dioxide, and water into glucose and oxygen.
• Photosynthesis uses light energy to convert carbon dioxide and water into glucose and oxygen.
• What are the key factors affecting photosynthesis?

  Light, CO2, temperature, water
• Why is adequate water availability essential for photosynthesis?

  Water is a reactant
• What happens to the rate of photosynthesis when light intensity plateaus?

  It stops increasing
• What happens to the rate of photosynthesis at high carbon dioxide concentrations?

  It reaches a plateau
• Why does the rate of photosynthesis decrease at extreme temperatures?

  Enzymes denature
• Match the reactants and products of photosynthesis:

  Light Energy ↔️ Glucose

  Carbon Dioxide ↔️ Oxygen

  Water ↔️ No matching product
• What happens to the rate of photosynthesis if carbon dioxide concentration becomes limiting?

  It plateaus
• The rate of photosynthesis plateaus because factors such as carbon dioxide concentration or temperature
• What is the effect of low light intensity on photosynthesis?

  Increases rate
• Light intensity affects photosynthesis by providing more light energy
• At moderate carbon dioxide concentration, the photosynthesis rate continues to increase
• How does temperature affect the rate of photosynthesis?

  Increases up to optimal level
• What happens to the photosynthesis rate at low temperatures?

  Decreases due to reduced enzyme activity
• Order the steps in how temperature affects photosynthesis rate.

  1️⃣ Photosynthesis rate increases with temperature

  2️⃣ Enzymes function optimally

  3️⃣ Temperature exceeds optimal level

  4️⃣ Enzymes denature, rate declines sharply
• Match the factor with its effect on photosynthesis:

  Light Intensity ↔️ Increases rate up to a certain point

  Carbon Dioxide Concentration ↔️ Increases rate until limited by other factors

  Temperature ↔️ Increases rate up to optimal level, then decreases
• Moderate temperatures always increase photosynthesis rate.


  True
• Temperature increases the rate of photosynthesis up to an optimal level.
• As light intensity increases, the rate of photosynthesis increases because more light energy is available.
• Carbon dioxide concentration is essential because CO2 is a key reactant in photosynthesis.
• Higher temperatures increase the activity of enzymes in photosynthesis up to an optimal temperature.
• What are the reactants of photosynthesis?

  Light, CO2, water
• Higher carbon dioxide concentration increases the rate of photosynthesis until other factors become limiting.