B4

• What is the optimum factor for growth in photosynthesis?

  Favourable or best factor for growth
• What is the limiting factor for the rate of photosynthesis?

  Light intensity
• How does light intensity affect the rate of photosynthesis?

  Higher light intensity increases the rate
• What happens to photosynthesis at low light intensity?

  The rate of photosynthesis is low
• What is another limiting factor for photosynthesis besides light intensity?

  CO₂ concentration
• How does CO₂ concentration affect the rate of photosynthesis?

  Increased CO₂ levels raise the rate
• What is the limiting factor related to temperature in photosynthesis?

  Temperature can limit the rate
• What is the optimum temperature for photosynthesis mentioned?

  22°C
• What happens to enzymes at high temperatures during photosynthesis?

  Most enzymes are denatured
• What is the effect of temperature on the rate of photosynthesis?

  Rate increases with temperature until enzymes denature
• What temperature range causes enzyme denaturation in photosynthesis?

  40-60°C
• What is the equation for photosynthesis?

  Carbon dioxide + water = oxygen + glucose
• What is the abbreviated formula for photosynthesis ?

  6CO2 + 6H2O → C6H12O6 + 6O2
• What is glycogen in the muscles converted to?

  Glucose
• Anaerobic respiration is respiration without what?

  Oxygen
• What is the toxic substance produced in anaerobic respiration?

  Lactic acid
• What is “oxygen debt”?

  The amount of oxygen needed to break down lactic acid
• What is the acronymn to the 7 Necessary things of living beings? (mrs gre)

  M-movement

  (R-respire)

  S-sensitivity

  G-growth and cell division

  R-reproduce

  (E-excrete)

  n-nuitrition
• What type of action is respiration?

  Chemical
• What organelle does aerobic respiration take place in?

  Mitochondria
• What are the products of photosynthesis?

  Glucose and oxygen
• Where does photosynthesis occur in the cell?

  Chloroplast
• Is photosynthesis endothermic or exothermic?

  Endothermic
• Name the pigment in chloroplasts ans it’s role I’m photosynthesis

  Chlorophyll-absorbs light
• How are palisade cells adapted for photosynthesis?

  -packed tightly together

  -near the surface of the leaf

  -lots of chloroplasts witj chlorophyll to absorb light
• Explain an adaptation of spongy mesophyll tissue in plants

  Big air spaces

  Large surface area for efficient gas exchange/diffusion of gases
• State an adaptation of the leaf for efficient photosynthesis

  Broad leaves/thin/have chlorophyll
• How does the stomata help to maintain efficient gas exchange in leaves

  Allow gases to move in and out of the leave and maintaining steep concentration gradient
• Root hair cells have lots of mitochondria to release energy, what is this energy used for?

  Active transport of mineral ions into root hair cells
• Why do plants need water?

  For photosynthesis
• Give one importance of respiration

  Metabolic reactions e.g. muscle contraction
• State one response of the body to exercise

  Increase heart rate
• What happens to the glycogen stored in muscles when you exercise

  Converted into glucose for respiration
• Name the toxic substance produced by anaerobic respiration

  Lactic acid
• Define oxygen debt

  Amount of oxygen needed to break down lactic acid
• What do plants make in anaerobic respiration

  Ethanol and carbon dioxide
• Give one use of yeast doing anaerobic respiration

  Making bread and alcohol
• Give one example of a metabolic reaction in cells

  Convert glucose to glycogen starch or cellulose
• What is the acronymn to remember factors that affect the rate of photosynthesis

  T-temperature

  A-amount of chlorophyll

  L-light intensity

  C-co2 concentration
• What happens during aerobic respiration?(3)

  Glucose reacts with oxygen (1)

  Energy is released (1)

  Carbon dioxide and water are produced as waste products (1)