Photosynthesis 0.0 / 5 ? BiologyPhotosynthesis and transpirationGCSEAQA Created by: IJM22Created on: 10-03-19 11:53 What type of reaction is photosynthesis? Endothermic reaction 1 of 35 Why is photosynthesis an endothermic reaction? Because it takes in energy 2 of 35 Where does endothermic take place? In the leaves of a plant 3 of 35 What happens in the leaves of a plant? 1) Photosynthesis takes place in the leaves of a plant 2) Leaves contain the green chemical chlorophyll 4 of 35 What do leaves contain? Green chemical called chlorophyll 5 of 35 What does chlorophyll do? Absorb light energy 6 of 35 What happens when the light intensity is zeo? The rate of photosynthesis is zero 7 of 35 Why do plants needs photosynthesis? To carry out photosynthesis 8 of 35 What happens if we increase the light intestiny ? The rate of photosynthesis increases, meaning that the reaction gets faster 9 of 35 What does it mean if the light intestisty increases and the rate of photosynthesis increases? It tells us that the light intestity was limiting 10 of 35 What happens if we keep increasing the light intestity? Then there comes a point where the rate of photosynthesis no longer increases 11 of 35 What happens if we increases the rate of carbon dioxide levels? The rate of photosynthesis increases 12 of 35 What two factors can affect the rate of photosynthesis? 1) Amount of chlorophyll in the leaf 2) Temperature 13 of 35 What happens if we increase the rate of temperature? Enzymes involved in photosynthesis work faster, so the rate increases 14 of 35 What happens in photosynthesis? Carbon dioxide and water are chemically reacted using the energy from the light, which produces the sugar glucose and the gas oxygen 15 of 35 What are the uses of glucose from photosynthesis? 1) Release energy in respiration 2) Produce the insoluble storage molecule starch 3) To produce amino acids 16 of 35 What does the glucose produced in photosynthesis convert to? Fats and oils 17 of 35 What are the fats and oils used by the plant for? As a storage form of energy 18 of 35 Why are amino acids used by the plant? To synthesise proteins 19 of 35 How do plants make amino acids from glucose? They need to absorb nitrate ions from the soil 20 of 35 Why do humans need energy For chemical reactions to build larger molecules 21 of 35 How is respiration supplied? By a process called cellular respiration 22 of 35 What type of reaction is respiration? Exothermic as it releases energy 23 of 35 What happens in aerobic respiration? The sugar glucose is reacted with the oxygen gas, which produces carbon dioxide and water and releases energy 24 of 35 Why does aerobic respiration release a great amount of energy? Because the glucose molecule has been fully oxidised 25 of 35 Why do muscle cells need a great amount fo energy? For contraction 26 of 35 What happens when there is a shortage of oxygen? Muscle cells respire anaerobically 27 of 35 What happens during aerobic respiration? Glucose is converted to lactic acid 28 of 35 Why does anerobic respiration release less energy than aerboic respiration? Because in anerobic respiration, the oxidation of glucose is incomplete 29 of 35 Where else can anerobic respiration take place? In plant cells and yeast cells 30 of 35 What is anerboic respiration called in yeast cells? Fermentation 31 of 35 How does dough rise? By fermentation - it creates bubbles in the dough causing it to rise 32 of 35 What happens when the body needs more energy? Aerobic respiration increases 33 of 35 How does the body provide more oxygen? 1) Both the breathing rate and breathing volume increases 2) The heart rate increases the oxgenated blood around the body 34 of 35 What happens during long periods of vigorous activity? 1) The lactic acid causes the muscles to become fatigued 2)The body then has to remove the lactic acid from the muscles- creates oxygen debt 35 of 35
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