You should include:

A definition of photosynthesis - What is it?? Which organisms do it?? You should also include a word equation.
"Photo" means light and "synthesis" means to make. Photosynthesis is the process of how plants make their own food by the process of converting carbon dioxide and water into organic substances (eg. sugars) using the energy from the sun light.
Plants take in carbon dioxide from the air and water from the soil, they use light energy from the sun to turn these substances into food (sugar).
Word equation:

 carbon dioxide water → (light energy ) → sugar oxygen


A definition of respiration - What is it?? Which organisms do it?? You should also include a word equation.
Respiration is when an organism releases energy from food. Every living thing has to respirate because respiration is part of the 8 life processes. It is one of the essential processes of being able to live.




An explanation of how the two processes affect one another.
Photosynthesis happens when plants convert carbon dioxide and water into sugar and oxygen with help from the suns light rays. Respiration is when living things release energy from food. If photosynthesis didn't occur then respiration wouldn't be able to happen either. Because its the sugar and oxygen that the plants make during photosynthesis that allows plants and animals to make carbon dioxide and water when they respire. Both plants and animals depend on one another to make the things they need to work.




An explanation of what could happen to all organisms and the planet if the number of plants in the world continues to be reduced.
If there aren't any plants left, there won't be any photosynthesis which means living organisms won't be able to receive oxygen which means they won't be able to breath and they won't be able to obtain sugars/energy, which means they'll eventually die of this.
If there aren't any living organisms, plants won't be able to receive the carbon dioxide needed for photosynthesis; which means global warming will increase therefor slowly killing every living organism because plant wont be able to release oxygen for everything to breath.






Plants make their own food in their leaves.
This is called photosynthesis it happens in the chloroplasts which are mainly in the leave cell.
Plants take in carbon dioxide from the air and water from the soil. In photosynthesis they use light energy from the sun to turn these substances into food they make sugars also known as glucose.
Plants also make oxygen during the photosynthesis by taking water and co2.

The relationship between photosynthesis and respiration is photosynthesis needs co2 and water which is provided by respiration.photosynthesis creates sugar and oxygen, we breath in oxygen and eat the plants which gives us energy from the sugar.

Us humans breath out carbon dioxide which plants need to do photosynthesis and they gather water from the roots and then this process happens again when plants gather CO2 + water they use a chemical reaction to combine the 2 substances to create sugar + oxygen, then this process repeats itself.