1.5.2 Factors Affecting Photosynthesis

• How do carbon dioxide levels affect the rate of photosynthesis?

  Increases up to saturation
• Match the reactants, energy source, and products of photosynthesis:

  Carbon Dioxide ↔️ Reactant

  Sunlight ↔️ Energy Source

  Glucose ↔️ Product
• Which light wavelengths does chlorophyll absorb most efficiently?

  Red and blue
• What is the primary function of chlorophyll in photosynthesis?

  Absorbs light energy
• How does increasing carbon dioxide levels affect the rate of photosynthesis?

  Increases up to saturation
• Plants absorb green light most efficiently for photosynthesis.

  False
• Chlorophyll absorbs red and blue light wavelengths most efficiently.


  True
• What happens to the rate of photosynthesis beyond the carbon dioxide saturation point?

  No additional increase
• Low temperatures slow down enzyme activity
• Why do plants close their stomata during water scarcity?

  To conserve water
• What are the products of photosynthesis?

  Glucose and oxygen
• Chlorophyll absorbs red and blue light wavelengths most efficiently, while reflecting green
• Arrange the effects of temperature on photosynthesis rate from lowest to highest efficiency:

  1️⃣ Low temperatures: Slow down enzyme activity

  2️⃣ Optimal temperature: Maximizes enzyme efficiency

  3️⃣ High temperatures: Denature enzymes
• A deficiency in any limiting factor will restrict the photosynthesis rate.


  True
• Chlorophyll absorbs green light most efficiently.

  False
• Water availability has no impact on photosynthesis.

  False
• Increasing light intensity always increases the rate of photosynthesis indefinitely.

  False
• Arrange the steps in the effect of light intensity on photosynthesis:

  1️⃣ Low light intensity

  2️⃣ Increasing light intensity

  3️⃣ Photosynthesis rate increases

  4️⃣ Saturation point reached

  5️⃣ No further increase in rate
• Chlorophyll absorbs all light wavelengths equally.

  False
• What is the saturation point in photosynthesis related to light intensity?

  No further increase
• What effect does increasing light intensity have on photosynthesis up to the saturation point?

  Increases the rate
• Why do plants appear green?

  They reflect green light
• Enzymes in photosynthesis are most active within a temperature range of 25-35°C.


  True
• Match the temperature range with its effect on photosynthesis rate:

  Low ↔️ Slows down enzyme activity

  Optimal (25-35°C) ↔️ Maximizes enzyme efficiency

  High ↔️ Denatures enzymes
• Photosynthesis converts light energy into chemical energy in the form of glucose.


  True
• Chlorophyll is found in the chloroplasts of plant cells.

  True
• Photosynthesis relies on enzymes that are most active within a specific temperature range.


  True
• When water is scarce, plants close their stomata
• Match the mineral nutrient with its role in photosynthesis:

  Nitrogen ↔️ Chlorophyll formation

  Phosphorus ↔️ Energy transfer

  Potassium ↔️ Water and CO2 regulation

  Magnesium ↔️ Enzyme activation
• Photosynthesis is the process by which plants convert light energy into chemical energy in the form of glucose
• Temperature affects photosynthesis because it influences the activity of enzymes
• Why is light essential for photosynthesis?

  Provides energy for conversion
• Chlorophyll absorbs red and blue light most efficiently, while green light is reflected
• Chlorophyll reflects green light, which is why plants appear green
• Beyond the saturation point, additional carbon dioxide increases photosynthesis.

  False
• Light provides the energy plants need to convert carbon dioxide and water into glucose
• Chlorophyll is found in the chloroplasts
• Arrange the carbon dioxide levels in order of their effect on photosynthesis rate, from slowest to fastest:

  1️⃣ Low

  2️⃣ Medium

  3️⃣ High (up to saturation)
• What happens to enzymes at high temperatures during photosynthesis?

  They denature
• Limited water availability reduces the intake of carbon