Bioenergetics- Paper 1 Flashcards
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