Flashcards in 4 Bioenergetics Deck (33)
Is photosynthesis endothermic or exothermic?
State the equation of photosynthesis.
6CO2 + 6H2O --> C6H12O6 + 6O2
Where does photosynthesis occur in the cell?
What is photosynthesis?
Building glucose from carbon dioxide and water using light
Name the pigment in chloroplasts that absorbs light.
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?
Apart from light and carbon dioxide concentration, name one other limiting factor of photosynthetic rate.
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?
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?
Where does aerobic respiration occur in the cell?
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.
State an effect on your body after anaerobic respiration.
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.
Give one example of a metabolic reaction in cells.
Convert glucose to glycogen,starch,cellulose/Make lipids/proteins/Respiration/Photosynthesis/Breakdown of proteins
State a function of liver.
Detoxification/Breakdown of old blood cells/Remove lactic acid (convert to glucose)
Pollen grains grow down into female flowers on their way to fertilising an egg. In the flower tissue, oxygen concentrations are low. Suggest which molecules are produced as a pollen grain respires
Ethanol and carbon dioxide. Pollen grains can respire anaerobically as the pollen tube moves towards an egg.
Describe how anaerobic respiration is important in bread making
The anaerobic respiration of) yeast is involved. Bubbles of carbon dioxide make the bread rise