The last lesson--Respiration and Photosynthesis

Okay, since today is your lesson, I shall make the lesson quite short. Enjoy! After this session, I would be studying for my final year exam so I would be very busy and still feel free ask me any questions.
What is photosynthesis?

• process by which plants use carbon dioxide, water and light trapped by chlorophyll to make food in the form of glucose, with oxygen given out during the process.
• the word equation is : carbon dioxide + water --(light + chlorophyll)-->> Oxygen + glucose
• takes place in the chloroplast which contains chlorophyll

The importance of Photosynthesis

• make chemical energy available to animals
• removes carbon dioxide and provides oxygen

Photosynthesis makes chemical energy available to animals

• plants provide organisms with food and energy to live directly or indirectly.
• plants are the primary food source because they made their own food.
• plants are called producers

What is aerobic respiration?

• is the process whereby food substances are broken down in the presence of oxygen with the release of energy in the living cells. Carbon dioxide and water are released as waste products.
• word equation is : oxygen + glucose -----> water + carbon dioxide + energy

What is Tissue Respiration?

• process food substances are broken down in living cells
• a large amount of energy is released for the cell to perform different activities

What is External Respiration?

• process of bring the oxygen from the surrounding environment to the cells for tissue respiration to take place.
• also responsible for removing from the body the carbon dioxide and water formed during tissue respiration
  
• breathing is part of external respiration

The importance of Aerobic Respiration:
--Most organisms respire acrobatically. Energy released is used for:

• Growth
• Muscle contractions
• Digestion and absorption of food substances
• cell division
  

Breathing

• The physical process by which respiratory gases are exchanged with the surroundings
• movement that brings the air and into and out of the body

What is Anaerobic Respiration?

• is the breakdown of food substances in the absence of oxygen.
• releases less energy than Aerobic Respiration
• word equation of anaerobic respiration in humans : glucose ----> Lactic Acid + Energy
• word equation of anaerobic respiration in yeast : glucose --> carbon dioxide +Ethanol + Energy
  

Differences between Respiration and Photosynthesis :

Respiration Photosynthesis
-uses oxygen -produces oxygen
-uses food -produces its own food
-does not need chlorophyll -needs chlorophyll
-produce carbon dioxide -uses carbon dioxide
-takes place all the time -requires sunlight
-takes place in all living things -takes place in green plants
-takes place in all living cells -takes place in cells that contains chlorophyll
-energy is liberated -energy is stored in carbohydrate molecule
-oxygen is used, carbon dioxide and water -carbon dioxide and water are used, oxygen is used
are given out
-a destructive process, resulting in the -constructive process, resulting in building up
of carbohydrate molecule
breakdown of carbohydrate molecules
-occurs at all times in all cells, independent -occurs in cells which contains chlorophyll the under the presence of sunlight
of chlorophyll and sunlight

Similarity between Respiration and Photosynthesis

• Both involve energy
• Both involve enzymes

Okay, that's all. Thanks for all your support!! This marks our last lesson!! Goodbye!(: