6.1.2 Factors Affecting Photosynthesis

• What is the definition of photosynthesis?

  Produces glucose and oxygen
• Increasing carbon dioxide concentration increases the rate of photosynthesis.

  True
• Adequate water is necessary for photosynthesis because it is one of the reactants
• What happens to photosynthesis beyond the optimal light intensity level?

  It may cause damage
• Photosynthesis rates increase with temperature up to an optimal level.
• Temperature increases the photosynthesis rate up to an optimal level, after which it begins to decrease.
• Photosynthesis stops entirely at very low temperatures.

  False
• Sunlight is the energy source for photosynthesis
• What is released into the atmosphere as a byproduct of photosynthesis?

  Oxygen
• What happens to the rate of photosynthesis at very high temperatures?

  It decreases
• Match the factor with its effect on photosynthesis:

  Light Intensity ↔️ Increases up to optimal level

  Carbon Dioxide Concentration ↔️ Increases with higher concentration

  Temperature ↔️ Increases up to optimal level, then decreases

  Water Availability ↔️ Decreases with lack of water
• How does light intensity affect the rate of photosynthesis?

  Increases up to optimal level
• Why is water availability important for photosynthesis?

  Water is a reactant
• Match the factor with its effect on photosynthesis:

  Light Intensity ↔️ Increases up to optimal level

  CO2 Concentration ↔️ Increases with higher concentration

  Temperature ↔️ Increases to optimal level, then decreases

  Water Availability ↔️ Decreases with lack of water
• An optimal carbon dioxide concentration leads to a high photosynthesis rate.
• Steps of photosynthesis:

  1️⃣ Plants use sunlight, water, and carbon dioxide

  2️⃣ Light energy converts water and carbon dioxide into glucose

  3️⃣ Glucose and oxygen are produced as outputs
• The main factors affecting photosynthesis are light intensity, carbon dioxide concentration, temperature, and water availability.
• An optimal carbon dioxide concentration leads to a high photosynthesis rate.
• High concentrations of carbon dioxide are always beneficial for photosynthesis.

  False
• Match the mineral nutrient with its primary function in plants:

  Nitrogen ↔️ Production of chlorophyll

  Phosphorus ↔️ Root growth

  Potassium ↔️ Water balance
• If light intensity is high but CO2 is limited, then CO2 becomes the limiting factor.
• Understanding limiting factors is essential for maximizing photosynthesis in plants.


  True
• What is the balanced chemical equation for photosynthesis?

  6CO₂ + 6H₂O + Sunlight → C₆H₁₂O₆ + 6O₂</latex>
• What happens to photosynthesis beyond the optimal level of light intensity?

  May cause damage
• What is the effect of increasing carbon dioxide concentration on the rate of photosynthesis up to its optimal level?

  Increases the rate
• The optimal temperature range for photosynthesis results in a high rate of photosynthesis.
• What is the limiting factor in photosynthesis?

  Shortest supply factor
• What is the effect of increasing light intensity on photosynthesis if CO2 concentration is the limiting factor?

  No further increase
• Glucose is a sugar produced by photosynthesis that serves as food for plants.

  True
• Higher light intensity increases the rate of photosynthesis up to an optimal
• Arrange the key factors affecting photosynthesis in order of their increasing effect on the process:

  1️⃣ Water Availability

  2️⃣ Carbon Dioxide Concentration

  3️⃣ Light Intensity

  4️⃣ Temperature
• Increasing carbon dioxide concentration always enhances photosynthesis indefinitely.

  False
• Higher light intensity always results in a higher photosynthesis rate.

  False
• What happens to photosynthesis beyond the optimal level of light intensity?

  May cause damage
• What is the effect of very high temperatures on photosynthesis?

  Damages the plant
• Photosynthesis rates decrease beyond the optimal temperature range.


  True
• Why is excess carbon dioxide harmful for photosynthesis?

  No additional benefit
• What happens to the rate of photosynthesis if the temperature exceeds its optimal range?

  Decreases
• Mineral nutrients are absorbed by plant roots from the soil.


  True
• Optimizing all limiting factors is crucial to maximize the rate of photosynthesis.


  True