Bio

• What is the focus of the video discussed?

  Ed XL barie paper 2
• How can viewers navigate the video content?

  Using time stamps in the description
• What should viewers do after watching the video?

  Visit the website for predicted papers
• What process do plants use to produce oxygen and glucose?

  Photosynthesis
• What do chloroplasts absorb for photosynthesis?

  Light energy
• What gas do plants take in for photosynthesis?

  Carbon dioxide
• How do plants absorb water for photosynthesis?

  By osmosis from the soil
• What is the symbol equation for photosynthesis?

  CO2 + H2O + light energy → O2 + C6H12O6
• Why is photosynthesis considered an endothermic reaction?

  It takes in light energy
• What is one use of glucose produced in photosynthesis?

  Respiration for energy
• What can glucose be converted into for storage?

  Starch or lipids
• What is produced from glucose and nitrates in plants?

  Amino acids
• What factors affect the rate of photosynthesis?

  Light intensity, carbon dioxide, temperature
• How does light intensity affect photosynthesis?

  Increases rate until a limiting factor
• What happens to the rate of photosynthesis at high temperatures?

  It decreases after the optimum temperature
• What is the role of chlorophyll in photosynthesis?

  Absorbs light energy
• What does a flat line on a photosynthesis graph indicate?

  A limiting factor is affecting the rate
• How do temperature and carbon dioxide concentration interact at low light intensities?

  They have little effect on photosynthesis rate
• What is the effect of maintaining optimum conditions on photosynthesis?

  Increases the rate and yield
• How can light intensity be increased in a greenhouse?

  Using glass windows and extra lighting
• What is the purpose of using red and blue LEDs in greenhouses?

  To increase the rate of photosynthesis
• How can carbon dioxide concentration be controlled in a greenhouse?

  Pumping in from burners or engines
• What is the main method of transport in plants?

  Transpiration stream
• What is transpiration?

  Evaporation of water vapor through stomata
• How do guard cells regulate transpiration?

  By opening and closing stomata
• What happens to the transpiration rate when humidity increases?

  It decreases
• What is the role of the palisade mesophyll in leaves?

  Absorbs light for photosynthesis
• What is the function of the upper epidermis in leaves?

  Lets light through for photosynthesis
• What tissue transports water and minerals in plants?

  Xylem
• What is the function of phloem in plants?

  Transports sugars and amino acids
• How do xylem and phloem differ in their transport direction?

  Xylem transports one way, phloem two ways
• What is the transpiration stream?

  Flow of water from roots to leaves
• What causes the continuous column of water in the transpiration stream?

  Cohesion of water molecules
• How can the rate of transpiration be measured?

  Using a potometer
• What happens to the stomata when light intensity increases?

  More stomata open
• How does temperature affect the rate of transpiration?

  Higher temperature increases evaporation rate
• What is the role of the spongy mesophyll in leaves?

  Gas exchange occurs here
• What is the function of the lower epidermis in leaves?

  Contains stomata for gas exchange
• What is the primary function of leaves in plants?

  Photosynthesis and gas exchange
• How do different plant tissues contribute to photosynthesis?

  Each tissue has a specialized function