Bioenergetics- Paper 1
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Is photosynthesis endothermic or exothermic?
Endothermic
State the equation of photosynthesis.
6CO2 + 6H2O –> C6H12O6 + 6O2
Where does photosynthesis occur in the cell?
Chloroplast
What is photosynthesis?
Building glucose from carbon dioxide and water using light
Name the pigment in chloroplasts that absorbs light.
Chlorophyll
State an adaptation of the leaf for efficient photosynthesis.
Broad leaves/Thin/Have chlorophyll/Air spaces/Guard cells to regulate stomata opening
How does higher light intensity affect the rate of photosynthesis?
Increase
Apart from light and carbon dioxide concentration, name one other limiting factor of photosynthetic rate.
Temperature/Chlorophyll levels
Why would photosynthetic rate decrease at higher temperatures?
Enzymes become denatured
Name one use of glucose in plants.
Respiration/Make and strenghten cellulose cell wall/Make starch for storage/Make lipids as energy store
Why do plants need nitrates for good growth?
Make proteins
State one factor to maintain in a greenhouse for optimal plant growth.
High CO2 levels/Constant light/Appropriate temperatures/Regulate watering
Define ‘aerobic respiration’.
Exothermic reaction that breaks down glucose to release energy using oxygen
State the equation of aerobic respiration.
Glucose + Oxygen –> Carbon dioxide + Water
Is respiration endothermic or exothermic?
Exothermic
Where does aerobic respiration occur in the cell?
Mitochondria
Give one importance of respiration.
Metabolic reactions (eg. Build)/Muscle contraction/Mainting body temp/Active transport
State one response of the body to exercise.
Increase heart rate/breathing rate/Glycogen coverted to glucose/Increase blood flow to muscles
What happens to the glycogen stored in muscles when you exercise?
Converted into glucose for respiration
What is anaerobic respiration?
Breakdown of glucose to release small amount of energy without the use of oxygen
Name the toxic substance produced by anaerobic respiration.
Lactic acid
State an effect on your body after anaerobic respiration.
Muscle fatigue
Define ‘oxygen debt’.
Amount of oxygen needed to break down lactic acid
What do plants make in anaerobic respiration?
Ethanol and carbon dioxide