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9cplantsandphotosynthesis 120607151019-phpapp01
1.
© Boardworks Ltd
20041 of 20 © Boardworks Ltd 20051 of 24 KS3 Biology 9C Plants and Photosynthesis
2.
© Boardworks Ltd
20041 of 20 © Boardworks Ltd 20052 of 24 9C Plants and Photosynthesis Contents Leaves and glucose Summary activities Roots and water What is photosynthesis?
3.
© Boardworks Ltd
20041 of 20 © Boardworks Ltd 20053 of 24 How do plants grow? Many years ago people thought that plants ate soil and that made them grow. Think about it, if that really happened then there wouldn’t be any soil left! Plants actually grow by making their own food, not by eating soil! So where does the stuff that plants are made of come from?
4.
© Boardworks Ltd
20041 of 20 © Boardworks Ltd 20054 of 24 How do plants make their own food? One of the raw materials that plants need to make food does come from the soil, the other comes from the air. What are these two raw materials called? Plants use carbon dioxide and water to make their own food in a chemical reaction. What is the name of this reaction? carbon dioxide (from the air) water (from the soil)
5.
© Boardworks Ltd
20041 of 20 © Boardworks Ltd 20055 of 24 How do plants make their own food? Plants make their food from carbon dioxide and water in a chemical reaction called... photosynthesis. The food made by photosynthesis is the sugar glucose. Oxygen gas is also made as a by-product of photosynthesis. oxygen glucose carbon dioxide (from the air) water (from the soil)
6.
© Boardworks Ltd
20041 of 20 © Boardworks Ltd 20056 of 24 How do plants grow? Plants need energy for photosynthesis to take place. Where does this energy come from? The energy for photosynthesis comes from the Sun. Where in a plant does photosynthesis take place? oxygen glucose carbon dioxide (from the air) water (from the soil) light energy
7.
© Boardworks Ltd
20041 of 20 © Boardworks Ltd 20057 of 24 How do plants grow? Plant cells in the upper surface of leaves have chloroplasts which contain the green pigment called chlorophyll. oxygen glucose carbon dioxide (from the air) water (from the soil) light energy It is chlorophyll that absorbs light energy from the Sun to make photosynthesis happen. chlorophyll
8.
© Boardworks Ltd
20041 of 20 © Boardworks Ltd 20058 of 24 Photosynthesis summary Plants make their own food by the process of photosynthesis. In this chemical reaction, chlorophyll in plant cells absorbs light energy to change carbon dioxide and water into glucose and the by-product oxygen. What is the word equation for photosynthesis? glucose light energy chlorophyll carbon dioxide water oxygen This equation can be read as: “carbon dioxide and water, in the presence of light energy and chlorophyll, produces glucose and oxygen”.
9.
© Boardworks Ltd
20041 of 20 © Boardworks Ltd 20059 of 24 What is needed for photosynthesis?
10.
© Boardworks Ltd
20041 of 20 © Boardworks Ltd 200510 of 24 Photosynthesis: word equation activity
11.
© Boardworks Ltd
20041 of 20 © Boardworks Ltd 200511 of 24 9C Plants and Photosynthesis Contents Leaves and glucose Summary activities Roots and water What is photosynthesis?
12.
© Boardworks Ltd
20041 of 20 © Boardworks Ltd 200512 of 24 How are leaves adapted? Leaves are small ‘factories’ that produce food for plants by photosynthesis. Leaves are adapted so that photosynthesis can take place. Plants need carbon dioxide, water, sunlight and chlorophyll to carry out this important process. What features of leaves make them suitable for photosynthesis?
13.
© Boardworks Ltd
20041 of 20 © Boardworks Ltd 200513 of 24 How are leaves adapted? The features of leaf that make it suitable for photosynthesis are: A leaf is broad and flat to capture lots of sunlight. carry water to the leaf and take food from the leaf to the rest of the plant. Veins also help to support the leaf. Certain plant cells contain chloroplasts with chlorophyll. Small holes called stomata in the underside of a leaf allow gases in and out. Veins
14.
© Boardworks Ltd
20041 of 20 © Boardworks Ltd 200514 of 24 Inside a leaf
15.
© Boardworks Ltd
20041 of 20 © Boardworks Ltd 200515 of 24 What do plants use glucose for? glucose Some glucose is used straight away in respiration. Plants also carry out respiration to release the energy they need for life processes. Some glucose is converted into starch and other substances for storage. These stores of energy can be used later when the plant needs them. Some glucose is used to make new chemicals such as proteins, sugars and fats that the plant also needs to function properly. What do plants with the glucose made by photosynthesis?
16.
© Boardworks Ltd
20041 of 20 © Boardworks Ltd 200516 of 24 Testing leaves for starch
17.
© Boardworks Ltd
20041 of 20 © Boardworks Ltd 200517 of 24 9C Plants and Photosynthesis Contents Leaves and glucose Summary activities Roots and water What is photosynthesis?
18.
© Boardworks Ltd
20041 of 20 © Boardworks Ltd 200518 of 24 How does water enter a plant? Water is one of the raw materials needed for plants to carry out photosynthesis. How does water enter a plant? Water from the soil enters a plant through the roots. You can’t normally see them but roots are a very important part of a plant. Why are roots branched and spread out through the soil?
19.
© Boardworks Ltd
20041 of 20 © Boardworks Ltd 200519 of 24 How are roots adapted? Roots are branched and spread out for two reasons: to absorb water (and mineral salts) from a large amount of soil. to anchor the plant in the soil. Taking a closer look, roots are covered in root hair cells. Root hair cells have thin walls and a large surface area to help them absorb lots of water. How are roots adapted to their job? water
20.
© Boardworks Ltd
20041 of 20 © Boardworks Ltd 200520 of 24 Why do plants need water? Water is needed by plants for photosynthesis but this important liquid is also used in many other ways: to provide dissolved minerals that keep the plants healthy; to transport substances around the plant; to keep the plant rigid and upright; to keep the plant cool; to allow other chemical reactions to occur in plant cells. What happens to a plant if it does not get enough water?
21.
© Boardworks Ltd
20041 of 20 © Boardworks Ltd 200521 of 24 9C Plants and Photosynthesis Contents Leaves and glucose Summary activities Roots and water What is photosynthesis?
22.
© Boardworks Ltd
20041 of 20 © Boardworks Ltd 200522 of 24 Glossary chlorophyll – The green pigment inside chloroplasts that plants need for photosynthesis to take place. chloroplast – The part of a plant cell where photosynthesis occurs. glucose – The sugar plants make during photosynthesis. palisade cell – A type leaf cell with lots of chloroplasts. photosynthesis – The process by which plants use carbon dioxide and water to produce glucose and oxygen in the presence of light and chlorophyll. starch – Extra glucose from photosynthesis is stored as this substance which can be tested for with iodine. stomata – Small holes in the lower surface of a leaf that allow gases in and out. xylem – Tubes in veins that carry water around a plant.
23.
© Boardworks Ltd
20041 of 20 © Boardworks Ltd 200523 of 24 Anagrams
24.
© Boardworks Ltd
20041 of 20 © Boardworks Ltd 200524 of 24 Multiple-choice quiz
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