B4 Flashcards
What is photosynthesis?
The reaction the plants use to trap light energy
What type of reaction is photosynthesis?
Endothermic takes in energy
What is chlorophyll?
A chemical, which could absorb light energy
What is the word equation for photosynthesis?
-
Carbon dioxide + water -(light chlorophyll)> glucose + oxygen
What is the formula for glucose?
C(6)H(12)O(6)
What happens to photosynthesis if we increase light intensity
The rate of photosynthesis increases, this proves that the light intensity was limiting
What happens to photosynthesis if we increase carbon dioxide intensity?
The rate of reaction increases
What four factors change the rate of photosynthesis
Carbon dioxide levels
chlorophyll in leaf,
light intensity
temperature
What is the word equation for aerobic respiration?
Glucose + oxygen -> carbon dioxide + water
Energy is released
Why does aerobic respiration release a lot of energy?
Glucose has been fully oxidised
When does aerobic respiration occur?
When oxygen is pressent
What is the respiration where there is not enough oxygen
Anaerobic respiration
What is formed during anaerobic respiration in the muscles?
Glucose -> lactic acid
Energy is released
What is the difference between aerobic and anaerobic respiration?
-Aerobic requires oxygen whilst anaerobic does not
-Aerobic respiration produces a lot more energy
What are the uses of glucose produced in photosynthesis?
-Respiration
-to produce the insoluble sugar molecules,starch
-give the cell Celulose to strengthen the wall
-produce amino acids
Why do humans need energy?
Movement
keep warm
build larger molecules
What happens to the body during exercise?
Breathing rate and breathing volume increased to provide extra oxygen
Heart rate increases to pump more oxygenated blood in the body
What happens if not enough oxygen can Be supplied to the muscles during exercise ?
Anaerobic respiration takes place in the muscles
What does lactic acid do in the body?
-During long periods of vigourous activity, the lactic acid causes muscle fatigue
-Causes the muscles to stop contracting efficiently
What is oxygen debt?
The amount of extra oxygen, the body needs after exercise to deal with the accumulated lactic acid
why is yeast used in baking and brewing?
-produces carbon dioxide
-produces ethanol
-carbon dioxide makes bread rise
-carbon dioxide makes beer/cider fizzy
what chamber of the heart pumps blood to the body
Left ventricle
what blood vessel carries blood towards the heart muscle
coronary artery
compare anaerobic respiration in animal and plant cells
-muscle cells produce lactic acid whilst plant cells produce ethanol
-both release little energy
-both occur without energy
-muscle cells do not produce carbon dioxide whilst plant cells do
