Respiration and photosynthesis Leading Questions Why do we

Respiration and photosynthesis

Leading Questions Why do we eat food? What happens after we have eaten and digested our food? What happens once the broken down food gets into our cells?

Mitochondria • This is the power house of the cell. They are the organelles which take our food and make it into energy • The reaction which releases energy from food is called respiration.

Respiration – What is respiration? Respiration is the cellular reaction which reacts sugar and oxygen to produce water, carbon dioxide and energy. It is extremely important in most organisms as it is the primary way to produce energy for cell functioning.

Respiration chemical and word equation Sugar + Oxygen Carbon dioxide + Water + Energy

Where do mitochondria come from ? Mitochondria look a lot like some bacteria (single celled organisms) which exist today and we think they got into the cells of our ancestors billions of years ago and have been there since.

Chloroplasts A special organelle which is only in plants. This organelle is like the food production facility in plants. It houses a chemical reaction called Photosynthesis

Photosynthesis- what is it? Photosynthesis is a chemical reaction in plant cells which reacts carbon dioxide and water together in the presence of light to produce oxygen and sugar.

Photosynthesis word equation Carbon dioxide + Water + Light Oxygen + Sugar

Photosynthesis and chlorophyll Chloroplasts are filled with a pigment called chlorophyll. Chlorophyll absorbs the light energy and uses it to produce sugar. Chlorophyll is green and that’s why plants are green

Where do Chloroplasts come from? Chloroplasts also look like a bacteria and we think they got into the cells of early plants and have stayed there ever since.

Bringing it all together Why do plants need light? What happens to the sugar that plants make?