Plant Respiration and Photosynthesis Lesson 14

Plant Respiration All plants and animals need energy for cells to do their job. Animals get energy form the food that they eat. Plants can make their own food.

In plants, making food and releasing energy from food are connected. During photosynthesis, plants make their own food. During Respiration, food is changed into energy that is released. Both plants and animals use respiration.

Photosynthesis and respiration both involve the exchange of gases.

Respiration Respiration is the process of breaking down a sugar called Glucose to get energy that cells can use. Plants and animals need oxygen to release the energy in glucose. As cells use glucose, it breaks down to make carbon dioxide and water. The carbon dioxide is released into the air. Some of the water is released as a gas called water vapour.

Glucose +Oxygen Carbon dioxide +water+ energy   C6 H12O6 + O2  CO2 + H2O + energy

Animals exchange oxygen and carbon dioxide in the lungs. Plants exchange the gases through their leaves. Stomata are tiny openings on the bottom surface of the leaf. These small holes open and close to allow water vapour and other gases to pass.

Place these statements in the correct order Place these statements in the correct order. (Number 1-4 in the correct order) As it gets used, glucose breaks down to make carbon dioxide and water Plants need oxygen to release the energy in glucose Carbon dioxide and water vapour is released into the air During respiration, glucose is broken down into energy that cells can use 3 1 4 2

Photosynthesis Plants make their own food. The food they make is called glucose, which is produced by photosynthesis. During this process, the chloroplasts in the leaves of green plants capture energy from sunlight.

The picture shows the process of photosynthesis The plant takes in water and carbon dioxide and uses energy from sunlight to make glucose. Oxygen is also produced in this process. The oxygen is released from the leaves into the air.

The equation shows what happens during photosynthesis Carbon dioxide + Water +Energy  Glucose +Oxygen   CO2 + H2O+ Energy  C6 H12O6 + O2

Any food that is not needed right away for energy is stored for later use. The glucose is stored in the form of starch

Questions What does a plant need to make glucose? ____________ , ______________and _____________ What does photosynthesis produce? __________________________and __________________

Respiration and Photosynthesis connection Use the diagram to find out how respiration and photosynthesis work together to help plants survive The plant needs to make its own food. Photosynthesis produces glucose and stores energy The plant needs to use the stored energy for respiration. Respiration breaks down glucose and releases energy. The plant uses this energy to grow and do its work.

Respiration and Photosynthesis connection

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