Photosynthesis

• What is the process by which plants use light for energy?

  Photosynthesis
• What type of reaction is photosynthesis considered to be?

  Endothermic reaction
• How does a seedling obtain the energy it needs to grow?

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

  In the leaves
• What is the green chemical in leaves that 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 result of photosynthesis along with glucose?

  Oxygen
• What is the word equation for photosynthesis?

  Carbon dioxide + Water → Glucose + Oxygen
• What happens to the rate of photosynthesis when light intensity is increased?

  The rate of photosynthesis increases
• What does it mean if light intensity is a limiting factor in photosynthesis?

  Photosynthesis is not as fast as it could be due to insufficient light
• What happens when light intensity is increased beyond a certain point?

  The rate of photosynthesis becomes constant
• What is produced during photosynthesis?

  Glucose and oxygen
• What is another limiting factor that can affect the rate of photosynthesis?

  The level of carbon dioxide in the air
• What is the word equation for photosynthesis?

  Carbon dioxide + water → glucose + oxygen
• What happens to the rate of photosynthesis when carbon dioxide levels are increased?

  The rate of photosynthesis increases
• How is glucose used in respiration?

  It is used to release energy
• Where does respiration take place in plant cells?

  In the mitochondria
• What happens when carbon dioxide is no longer the limiting factor?

  The rate of photosynthesis levels off
• When does photosynthesis produce glucose?

  During the day when there is light
• How does the amount of chlorophyll affect photosynthesis?

  Less chlorophyll means lower rates of photosynthesis
• What is the second use of glucose produced by photosynthesis?

  To produce the insoluble storage molecule starch
• How does temperature affect the enzymes involved in photosynthesis?

  Higher temperatures increase enzyme activity until they denature
• How can starch be converted back to glucose?

  By the plant when it's needed, for example at night
• What happens to the rate of photosynthesis if the temperature continues to increase after enzymes denature?

  The rate of photosynthesis falls
• What are fats and oils used for in plants?

  As a storage form of energy
• What are the factors that affect the rate of photosynthesis?

  • Light intensity
  • Carbon dioxide level
  • Amount of chlorophyll
  • Temperature
• What is cellulose made from?

  Glucose produced by photosynthesis
• What is the overall process of photosynthesis?

  1. Light energy is absorbed by chlorophyll.
  2. Carbon dioxide and water are taken in.
  3. Light energy converts carbon dioxide and water into glucose and oxygen.
• What is the final use of glucose produced in photosynthesis?

  To produce amino acids
• What do plants need to absorb to make amino acids from glucose?

  Nitrate ions from the soil
• What are the main uses of glucose produced in photosynthesis?

  • Release energy in respiration
  • Produce insoluble storage molecule starch
  • Convert to fats and oils for energy storage
  • Produce cellulose for cell wall strength
  • Produce amino acids for protein synthesis
• What is the equation for photosynthesis?

  Light energy is absorbed by chlorophyll to react carbon dioxide with water to make glucose and oxygen.
• What happens to the rate of photosynthesis when light intensity is increased?

  The rate of photosynthesis initially increases as light intensity increases.
• What does it indicate when the rate of photosynthesis stops increasing despite further increases in light intensity?

  It indicates that light intensity is no longer the limiting factor.
• What are the three other factors that limit photosynthesis?

  Carbon dioxide concentration, temperature, and the amount of chlorophyll in the leaves.
• How can the concentration of carbon dioxide affect the rate of photosynthesis?

  Increasing the concentration of carbon dioxide can increase the rate of photosynthesis.
• What happens when the concentration of carbon dioxide is increased beyond a certain point?

  The rate of photosynthesis does not change because there is plenty of carbon dioxide available.
• What effect does increasing temperature have on the rate of photosynthesis?

  Increasing temperature can increase the rate of photosynthesis up to a certain point.
• What happens to enzymes in the leaf if the temperature is increased too much?

  The enzymes will start to denature, causing the rate of photosynthesis to fall.
• What can act as limiting factors in photosynthesis?

  Light intensity, carbon dioxide concentration, temperature, and the amount of chlorophyll in the leaf.