W. McConnell 2004 Kinross High School THE WORLD OF PLANTS (C) Making Food.

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Presentation transcript:

W. McConnell 2004 Kinross High School THE WORLD OF PLANTS (C) Making Food

W. McConnell 2004 Kinross High School 1. What is meant by photosynthesis? The process by which green plants make food in the presence of light.

W. McConnell 2004 Kinross High School 2. Complete the passage below Photosynthesis takes place in the ………….…… of plant cells. The ………………. gives the plant its green colour. It traps …….… energy from the sun. Chlorophyll and light are essential for ………………….…. The energy from the sun is used to make the raw materials ………………………… (from the air) and ………… (from the soil) combine. The products from this combination are ………… and ………… chloroplasts photosynthesis light chlorophyll water carbon dioxide oxygen glucose

W. McConnell 2004 Kinross High School 3. What conclusion would you come to if only the green areas in a variegated leaf showed the presence of starch? Chlorophyll is necessary for photosynthesis

W. McConnell 2004 Kinross High School 4. During photosynthesis carbon dioxide is taken in by plants and converted into a simple carbohydrate [glucose]. How is this carbohydrate then used by the plant? Stored as starch Used immediately for energy Used as building material (cellulose)

W. McConnell 2004 Kinross High School 5. What is meant by the term ’dry mass’? The weight of the plant tissue when all the water has been removed.

W. McConnell 2004 Kinross High School 6. When using the bubbler apparatus, what tells you how fast the plant is photosynthesising? The number of bubbles of oxygen produced every minute.

W. McConnell 2004 Kinross High School 7. When using the bubbler apparatus, what are each of the following pieces of equipment used for? source of light to vary distance of light from apparatus optimum temp for photosynthesis

W. McConnell 2004 Kinross High School 8. A typical set of results from a bubbler experiment at 20 o C are shown below. Why does the rate of photosynthesis level off after a while even although the light is getting brighter? CO 2 is the limiting factor – it has run out of CO 2 to make the reaction go any faster.

W. McConnell 2004 Kinross High School 9. Name the 4 things which a plant needs to photosynthesise. Light Water Chlorophyll Carbon dioxide

W. McConnell 2004 Kinross High School 10. If the graph below shows the results of increasing the temperature of elodea in a bubbler apparatus at 20 o C what is the limiting factor? Temp ( o C) Number of bubbles per minute Light or carbon dioxide

W. McConnell 2004 Kinross High School 11. What does the enzyme starch phosphorylase do in leaf cells? Converts excess glucose into starch to be stored in the leaf ?

W. McConnell 2004 Kinross High School 12. Below is a cross section of a leaf. Identify the xylem and phloem cells. Xylem Phloem

W. McConnell 2004 Kinross High School 13. What is the function of the phloem vessels? What is the function of the xylem vessels? To carry the glucose made in the leaves to other parts of the plant. To carry water and minerals from the soil to the leaves for photosynthesis.

W. McConnell 2004 Kinross High School 14. Xylem and phloem are together called vascular bundles. Apart from transport, what is the function of vascular bundles? Support

W. McConnell 2004 Kinross High School 15. Which cells in the vascular bundles are formed from columns of dead cells whose walls have been impregnated with a woody waterproof substance ? Name the woody waterproof substance. Xylem Lignin

W. McConnell 2004 Kinross High School 16.  Companion cells  Sieve tubes Name the 2 different types of cell found with the phloem tubes.

W. McConnell 2004 Kinross High School 17. Tiny pores found on the under surface of a leaf. What are stomata? When are the stomata open?  Open during the day  Closed during darkness

W. McConnell 2004 Kinross High School 18. Name the process by which water vapour passes out of the stomata to cool the plant. Transpiration

W. McConnell 2004 Kinross High School 19. A leaf has a large surface area so that: A leaf is thin so that : It increases the area for maximum light absorption gases can diffuse quickly to and from the cells

W. McConnell 2004 Kinross High School 20. Type of cell in leafFunction Cells found on either side of stomata. They control the size of the stomata. Guard cells Palisade mesophyll cells Top layer of cells. Contain most chloroplasts. Small holes which can open or close to let air in or out. Stomata

W. McConnell 2004 Kinross High School 21. Carbon dioxide Which gas does a plant take in through its leaves?

W. McConnell 2004 Kinross High School This is the end of the revision questions for the world of plants. These revision questions will automatically run again. If you want to return to the list of revision topics click on the back browser on your toolbar.