9 c plants and photosynthesis

2,385 views
2,259 views

Published on

0 Comments
2 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
2,385
On SlideShare
0
From Embeds
0
Number of Embeds
272
Actions
Shares
0
Downloads
102
Comments
0
Likes
2
Embeds 0
No embeds

No notes for slide

9 c plants and photosynthesis

  1. 1. KS3 Biology 9C Plants and Photosynthesis1 of 24 20 © Boardworks Ltd 2004 2005
  2. 2. Contents 9C Plants and Photosynthesis What is photosynthesis? Leaves and glucose Roots and water Summary activities1 of 242 20 © Boardworks Ltd 2004 2005
  3. 3. 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?1 of 243 20 © Boardworks Ltd 2004 2005
  4. 4. 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? carbon dioxide (from the air) water (from the soil) Plants use carbon dioxide and water to make their own food in a chemical reaction. What is the name of this reaction?1 of 244 20 © Boardworks Ltd 2004 2005
  5. 5. How do plants make their own food? Plants make their food from carbon dioxide and water in a chemical reaction called... photosynthesis. carbon dioxide (from the air) glucose oxygen water (from the soil) The food made by photosynthesis is the sugar glucose. Oxygen gas is also made as a by-product of photosynthesis.1 of 245 20 © Boardworks Ltd 2004 2005
  6. 6. How do plants grow? Plants need energy for photosynthesis to take place. Where does this energy come from? light energy carbon dioxide (from the air) glucose oxygen water (from the soil) The energy for photosynthesis comes from the Sun. Where in a plant does photosynthesis take place?1 of 246 20 © Boardworks Ltd 2004 2005
  7. 7. How do plants grow? Plant cells in the upper surface of leaves have chloroplasts which contain the green pigment called chlorophyll. light energy carbon dioxide chlorophyll (from the air) glucose oxygen water (from the soil) It is chlorophyll that absorbs light energy from the Sun to make photosynthesis happen.1 of 247 20 © Boardworks Ltd 2004 2005
  8. 8. 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? light energy carbon dioxide water glucose oxygen chlorophyll This equation can be read as: “carbon dioxide and water, in the presence of light energy and chlorophyll, produces glucose and oxygen”.1 of 248 20 © Boardworks Ltd 2004 2005
  9. 9. What is needed for photosynthesis?1 of 249 20 © Boardworks Ltd 2004 2005
  10. 10. Photosynthesis: word equation activity1 of 2010 of 24 © Boardworks Ltd 2004 2005
  11. 11. Contents 9C Plants and Photosynthesis What is photosynthesis? Leaves and glucose Roots and water Summary activities1 of 2011 of 24 © Boardworks Ltd 2004 2005
  12. 12. 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?1 of 2012 of 24 © Boardworks Ltd 2004 2005
  13. 13. 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.  Veins 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.1 of 2013 of 24 © Boardworks Ltd 2004 2005
  14. 14. Inside a leaf1 of 2014 of 24 © Boardworks Ltd 2004 2005
  15. 15. What do plants use glucose for? What do plants with the glucose made by photosynthesis? 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 glucose 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.1 of 2015 of 24 © Boardworks Ltd 2004 2005
  16. 16. Testing leaves for starch1 of 2016 of 24 © Boardworks Ltd 2004 2005
  17. 17. Contents 9C Plants and Photosynthesis What is photosynthesis? Leaves and glucose Roots and water Summary activities1 of 2017 of 24 © Boardworks Ltd 2004 2005
  18. 18. 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?1 of 2018 of 24 © Boardworks Ltd 2004 2005
  19. 19. 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 water them absorb lots of water. How are roots adapted to their job?1 of 2019 of 24 © Boardworks Ltd 2004 2005
  20. 20. 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?1 of 2020 of 24 © Boardworks Ltd 2004 2005
  21. 21. Contents 9C Plants and Photosynthesis What is photosynthesis? Leaves and glucose Roots and water Summary activities1 of 2021 of 24 © Boardworks Ltd 2004 2005
  22. 22. 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.1 of 2022 of 24 © Boardworks Ltd 2004 2005
  23. 23. Anagrams1 of 2023 of 24 © Boardworks Ltd 2004 2005
  24. 24. Multiple-choice quiz1 of 2024 of 24 © Boardworks Ltd 2004 2005

×