This are our theories about photosynthesis and respiration.
1)Phototosynthesis and respiration are both chemical reactions.There is an exchange of gases and energy is involved.The definiton of photosynthesis is the process in which green plants use raw materials- carbon dioxide and water- to produce simple sugars and oxygen using sunlight trapped by chlorophyll.The definition of respiration is a chemical process in which glucose is broken down into carbon dioxide and water,together with a release of energy,
So what does photosynthesis and respiration have to do about living things?
During the day plants breathes in carbon dioxide and gives out oxygen.At night, the opposite happens.This is what you call photosynthesis.To ensure that there is not too much or too little carbon dioxide in the air, animals breathe in oxygen and gives out carbon dioxide.This is where respiration comes into the picture.
Why do plants photosynthesize?
To obtain the food they need, plants undergo photosynthesis.To do this, plants need the light energy from the Sun.The light energy is then trapped by the green pigment called chlorophyll contained in chloroplasts which can be found in the cells of the green leaves.Other than light carbon dioxide and water is needed.The formula is shown below.
→→→→→→→→
light energy
glucose+oxygen=water+carbon dioxide+energy
What will happen if there are no plants?
Since humans and animals cannot make food because there is no chloroplasts in their cells,plants are the only source of oxygen.Humans also do not have the green colour of the plant's green leaves.
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In conclusion, we have learned that without photosynthesis and respiration living on earth is totally impossible.
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