Please enable JavaScript.
Coggle requires JavaScript to display documents.
Science 2.2 Cell respiration and Photosynthesis, Text book - Coggle Diagram
Science 2.2 Cell respiration and Photosynthesis
What is respiration?
Respiration can be divided into external respiration (breathing) and internal respiration (cell respiration). Breathing involves exchange of gases between the organism and environment whereas cell respiration is the oxidation process and break down of glucose that occur inside living cells to release energy.
Cell respiration
Cell respiration is the process of breaking down food to release energy. The energy released will be used for all life processes that occur inside the body. Cell respiration requires oxygen and glucose to produce energy, carbon dioxide and water.
Glucose + oxygen
carbon dioxide + water + energy
Photosynthesis
Plants make their own food through photosynthesis. Food made by plants is kept in the form of glucose known as starch.
Light energy, carbon dioxide, water and chlorophyll are needed for photosynthesis.
Test the presence of starch
Instruction:
(a) Dip a leaf into boiling water to break the cell wall of the leaf to soften it.
(b) Half fill a boiling tube with ethanol and put the leaf into it.
(c) Place the boiling tube into a beaker containing hot water.
(d) After 5 minutes, take out the leaf from the boiling tube. Observe the colour changes on the leaf.
(e) Dip the leaf into the hot water for a few seconds to soften the leaf.
(f) Place the leaf on a white tile and put a few drops of iodine solution on it.
Observation: The colour of iodine solution changes from brown to dark blue if starch is present.
carbon dioxide + water
glucose + oxygen
the differences between cell respiration and photosynthesis
cell respiration
Occurs in humans, animals, plants and microorganisms
Breaks down glucose to produce energy
Uses chemical energy in food
Uses glucose and oxygen to produce carbon dioxide, water and energy
Process to release energy
Occurs at all times
Occurs in mitochondria
photosynthesis
Occurs only in the presence of light
Uses carbon dioxide and water to produce glucose and oxygen
Synthesies glucose
Occurs in plants and microorganisms
Uses energy from light
Process to absorb energy
Occurs in chloroplast
Text book
https://anyflip.com/txjkt/imiy
