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Life Science #3

Carbon Dioxide - Oxygen Cycle
by

Lauri Marek

on 20 March 2011

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Transcript of Life Science #3

Life Science Carbon Dioxide - Oxygen Cycle All living things are organisms.
Plants and animals are living things. Therefore all plants and animals are organisms. Plants and animals have different characteristics. Plants need carbon dioxide to survive. Plants stay in one place. Animals can move on their own. Animals need oxygen to survive. Plants make their own food. Animals must find food to eat. One part of a plant are the roots. The roots anchor the plant to the ground. The roots also absorb water and nutrients from the soil. Another plant part is the stem. The stem holds up the leaves of the plant. The stem also transports the water and nutrients from the roots to the leaves. Leaves are a very important plant part. This is where the plant's food is made. The leaves absorb sunlight and take in carbon dioxide gas. Plant cells contain tiny chloroplasts that have a green substance called chlorophyll. The chlorophyll traps and absorbs energy from sunlight. Chlorophyll also gives a plant its green color. The leaves have tiny holes called stomata. The stomata allows carbon dioxide (gas) and sunlight to enter the plant. The stomata also allows oxygen (gas) and water vapor (gas) to leave the plant. Photosynthesis is the process where a plant makes its own food. Remember, a plant must make its own food because it can't move around to look for food. Let's go over the steps that take place during photosynthesis. During photosynthesis, plants use energy from sunlight to help make food. The sunlight enters the leaf through the stomata and is trapped in the chlorophyll in the leaves. Roots absorb water and nutrients from the soil and they are transported up the stem to the leaves. Carbon dioxide (a gas) enters the leaf through the stomata. Inside the leaf, the water mixes with the carbon dioxide. Energy from the sun changes the mixture into a type of sugar (glucose) which is food for the plant. In the process of making the food, oxygen (a gas) and water vapor (a gas) are also produced. The plant doesn't need these products. These waste products are released back into the atmosphere through the stomata. Basic Parts of a Plant Photosynthesis is just one part of the carbon dioxide - oxygen cycle! Respiration is when an animal (or human) takes in oxygen (a gas) that has been given off by the plants. They use the oxygen when they respirate (breathe) and in the process give off carbon dioxide (a gas) back into atmosphere as a waste product. So why does deforestation have such a negative impact on the carbon dioxide - oxygen cycle? That's right...trees and plants produce oxygen! 5.9 C
Identify the significance of the carbon dioxide - oxygen cycle to the survival of plants and animals.
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