Photosynthesis/factors&use of glucose,res,excerci+metab,prac

• What is the main product of photosynthesis?


  Glucose
• What are the five main uses of glucose in plants?


  • Energy source for respiration
  • Building blocks for growth
  • Stored as starch
  • Used in making cellulose for cell walls
  • Converted into fats and oils
• What factors can limit the rate of photosynthesis?


  Light intensity, carbon dioxide concentration, and temperature
• What happens to the rate of photosynthesis when light intensity increases?


  The rate of photosynthesis increases steadily up to a certain point
• What occurs when light intensity is no longer a limiting factor?


  The rate of photosynthesis will no longer increase with further increases in light intensity
• How can you change light intensity in a lab experiment?


  By moving a lamp closer to or further away from the plant
• What is the relationship between carbon dioxide concentration and the rate of photosynthesis?


  Increasing CO₂ concentration increases the rate of photosynthesis up to a point
• What happens when both light and CO₂ are in plentiful supply?


  The limiting factor for photosynthesis must be temperature
• What typically happens to enzymes at low temperatures?


  They work more slowly
• What temperature can destroy the enzymes needed for photosynthesis?


  About 45°C
• What does a graph showing the rate of photosynthesis against light intensity and temperature illustrate?


  • Rate of photosynthesis increases with light intensity
  • Levels off when light is no longer limiting
  • Temperature can also be a limiting factor
• How can oxygen production be used in experiments?


  To measure the rate of photosynthesis
• What are the steps in the oxygen production experiment with pondweed?


  1. Place a light source at a specific distance from pondweed
  2. Allow pondweed to photosynthesize
  3. Measure the length of the gas bubble in the capillary tube
  4. Control variables like temperature and time
  5. Repeat with different distances of the light source
• How can you measure the effect of temperature on photosynthesis?


  By using a water bath with the pondweed
• What is the inverse square law related to in photosynthesis?


  Light intensity and distance
• What is respiration in biological terms?


  It is the process of transferring energy from food
• What is metabolism?


  All the chemical reactions in an organism
• What is aerobic respiration?


  The most efficient way to release energy from glucose using oxygen
• Where do most reactions in aerobic respiration occur?


  Inside mitochondria
• What is the word equation for aerobic respiration?


  Glucose + Oxygen → Carbon Dioxide + Water
• What happens to the body during exercise in terms of respiration?


  The body respires more to meet increased energy demands
• What is oxygen debt?


  A temporary shortage of oxygen in the body during intense exercise
• How can you investigate the effect of exercise on the body?


  By measuring breathing rate and heart rate during different activities
• What are the differences between aerobic and anaerobic respiration?

  Aerobic Respiration:

  • Requires oxygen
  • More efficient energy release
  • Occurs in mitochondria

  
  

  Anaerobic Respiration:

  • Occurs without oxygen
  • Less efficient energy release
  • Produces lactic acid in animals