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Photosynthesis Worksheet

Tan C / Kuching

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Teaches: Mathematics, Physics, Science, Additional Math, Chemistry, Additional Maths

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  1. Il Page ENFORCEMENT TEST 1 Think of two more words that begin with 'photo'. What does each of your words mean? 2 Write the word equation for photosynthesis. 3 What are the FACTORS (inputs) needed for photosynthesis? 4 What are the PRODUCTS needed for photosynthesis? 5 grass cricket spider small bird hawk In the food chain above, at which point does photosynthesis take place? 6 What are the advantages of photosynthesis? 7 Why most of the leaves are green and very thin? 8 The is the function of the vein in a leaf?
  2. 2 Page 9 Label the part of the leaf. 10 Complete the table. Part of the leaf 1. Stomata 2. Waxy layer 3. Upper epidermis 4. Vein 5. Palisade layer 6. Spongy layer Function 11 Think about what you know about the structure of cells. What is the name of the part of a plant cell — also beginning with 'chloro' — that contains chlorophyll? 12 Suggest why leaves are green, but roots are not. 13 If you grew some seedlings in the dark. What happened to the chlorophyll in them?
  3. 13 Page 14 What are the functions of roots? 15 How roots absorb water and minerals? 16 Explain how root hairs help plants to absorb a lot of water in a short time. 17. Label xylem in diagram below C 9 18. What is xylem vessel?
  4. 4 Page gas collecting test tube beaker pond water upside-down funnel water plant block to support funnel How to find out if a water plant is photosynthesising? What is your observation if the rate of photosynthesis is increased? Describe how you would carry out a test to determine the type of gas collected. Testing for the presence of oxygen Oxygen gas relights a glowing splinter because it supports combustion. Glowing splinter Oxygen gas 2 Glowing splinter burns brightly
  5. Page 5 Describe how you would carry out a test ON THE LEAVES of the water plant to determine whether photosynthesis is carried out.
  6. Page Plants need carbon dioxide (C02) for photosynthesis. 6 HYPOTHESIS cotton wool with lime water (absorbs C02) leaf p leaf O potassium hydroxide pellets (absorbs C02) Manipulated variable: Presence of carbon dioxide (C02) Responding variable: of starch Constant variables: water and chlorophyll OBSERVATIONS • Starch is not formed in leaf P. Photosynthesis does not take place in the absence of C02. • Leaf Q turns blue-black when tested with iodine solution. It contains starch. Photosynthesis takes place in the presence of C02. CONCLUSION Carbon dioxide is needed for photosynthesis. The hypothesis is accepted. HYPOTHESIS Plants need sunlight for photosynthesis. OBSERVATIONS paper clip black paper Manipulated variable: Presence of sunlight Responding variable: Presence Of starch Constant variables: Presence of C02. water and chlorophyll blue-black (contain starch) brown (no starch) • The parts exposed to sunlight turn blue-black. Starch is present and photosynthesis has occurred. • The covered part does not turn blue-black. Starch is absent and photosynthesis does not occur. CONCLUSION Sunlight ts needed for photosynthesis. The hypothesis is accepted. HYPOTHESIS Plants need chlorophyll for photosynthesis. In a variegated leaf, only certain parts are green while the rest of the leaf does not contain chlorophyll. reen part (Wii chlorophyll) — white part (no chlorophyll) variegated leaf OBSERVATIONS the green part - turns blue-black —starch IS present - the white part turns bro•.vn —starch is absent Only the green part (with chlorophyll) shows the presence of starch because photosynthesis has occurred in it. Manipulated variable: Presence of chlorophyll Responding variable: Presence of starch Constant variables: Presence of C02. water and sunlight CONCLUSION Chlorophyll is needed for The hypothesis is accepted.
  7. Page 7 Plan an experiment to determine the relationship between light intensity and rate of photosynthesis Is there a correlation between light intensity and the rate of photosynthesis? sunlight bell jar balsam plant concentrated sodium hydroxide solution Why the balsam plant can't carry out photosynthesis? Photosynthesis is a process by which the in green plants absorbs and to make food from
  8. 8 Page ENFORCEMENT TEST 1 Think of two more words that begin with 'photo'. What does each of your words mean? Phototropism Photosynthesis Photograph 2 Write the word equation for photosynthesis. sunlight carbon dioxide + water ........................................................+ glucose + oxygen C02 + H20 chlorophyll sunlight CH O +02 6 12 6 chlorophyll 3 What are the FACTORS (inputs) needed for photosynthesis? carbon dioxide + water 4 What are the PRODUCTS needed for photosynthesis? glucose + oxygen 5 grass cricket spider small bird hawk In the food chain above, at which point does photosynthesis take place? At grass (Producer) 6 What are the advantages of photosynthesis?
  9. 19 Page Produce oxygen to animals in order to carry out respiration. To maintain the concentration of oxygen in the ecosystem To decrease the concentration of carbon dioxide in the ecosystem 7 Why most of the leaves are green and very thin? Green-contain green pigment called chlorophyll Thin-in order to allow light to reach all the cell inside the leaf. 8 The is the function of the vein in a leaf? carry water to the cells in the leaf. They also help to support the leaf and hold it out flat 9+10 Label the part of the leaf. Inside a leaf The diagram on the right shows what a leaf looks like if you c.ut it across, and then look at the cut edge. ILeaves are so thin that it is diflicult to irnagine they contain several layers of cells. It is the cells in the middle of the leaf that carry out photosynthesis. A vein carries water to the cells in the leaf. A waxy layer on the leaf surface stops the leaf cells from drying out. The upper epidermis protects the cells inside the leaf. The palisade layer contains cells that do most of the photosynthesis. The spongy layer has lots of air spaces. The cells in the spongy layer do a small amount of photosynthesis. The lower epidermis protects the cells inside the leaf. A stoma (plural: stomata) is a tiny hole in the lower epidermis. These holes let carbon dioxide from the air get into the leaf.
  10. e 110 11 Think about what you know about the structure of cells. What is the name of the part of a plant cell — also beginning with 'chloro' — that contains chlorophyll? chloroplast 12 Suggest why leaves are green, but roots are not. Because the leaves contains chlorophyll but the roots are not 13 If you grew some seedlings in the dark. What happened to the chlorophyll in them? Lower intensity of light at night time causing the rate of photosynthesis carried out by the chlorophyll decreased 14 What are the functions of roots? Absorbs water and minerals 15 How roots absorb water and minerals? You may remember that special cells called root hairs grow out of the surface of roots. Root hair cells provide a really big surface through which water and minerals can be absorbed 16 Explain how root hairs help plants to absorb a lot of water in a short time. You may remember that special cells called root hairs grow out of the surface of roots. Root hair cells provide a really big surface through which water and minerals can be absorbed 17. Label xylem in diagram below
  11. e Ill 18. What is xylem vessel? Xylem vessels are long, hollow tubes that carry water and minerals from the roots of the plant to its leaves gas collecting test tube beaker pond water upside-down funnel water plant block to support funnel How to find out if a water plant is photosynthesising? To see if it is giving off the bubble. What is your observation if the rate of photosynthesis is increased? More bubbles is released Describe how you would carry out a test to determine the type of gas collected.
  12. Testing for the presence of oxygen e 112 Oxygen gas relights a glowing splinter because it supports combustion. Glowing splinter 1) Oxygen gas 2 Glowing splinter burns brightly Describe how you would carry out a test ON THE LEAVES of the water plant to determine whether photosynthesis is carried out.
  13. e 113 Plants need carbon dioxide (C02) for photosynthesis. HYPOTHESIS cotton wool with lime water (absorbs C02) leaf p leaf O potassium hydroxide pellets (absorbs C02) Manipulated variable: Presence of carbon dioxide (C02) Responding variable: of starch Constant variables: water and chlorophyll OBSERVATIONS • Starch is not formed in leaf P. Photosynthesis does not take place in the absence of C02. • Leaf Q turns blue-black when tested with iodine solution. It contains starch. Photosynthesis takes place in the presence of C02. CONCLUSION Carbon dioxide is needed for photosynthesis. The hypothesis is accepted. HYPOTHESIS Plants need sunlight for photosynthesis. OBSERVATIONS paper clip black paper Manipulated variable: Presence of sunlight Responding variable: Presence Of starch Constant variables: Presence of C02. water and chlorophyll blue-black (contain starch) brown (no starch) • The parts exposed to sunlight turn blue-black. Starch is present and photosynthesis has occurred. • The covered part does not turn blue-black. Starch is absent and photosynthesis does not occur. CONCLUSION Sunlight ts needed for photosynthesis. The hypothesis is accepted. HYPOTHESIS Plants need chlorophyll for photosynthesis. In a variegated leaf, only certain parts are green while the rest of the leaf does not contain chlorophyll. reen part (Wii chlorophyll) — white part (no chlorophyll) variegated leaf OBSERVATIONS the green part - turns blue-black —starch IS present - the white part turns bro•.vn —starch is absent Only the green part (with chlorophyll) shows the presence of starch because photosynthesis has occurred in it. Manipulated variable: Presence of chlorophyll Responding variable: Presence of starch Constant variables: Presence of C02. water and sunlight CONCLUSION Chlorophyll is needed for The hypothesis is accepted.
  14. e 114 Plan an experiment to determine the relationship between light intensity and rate of photosynthesis Activity 1.3B investigating the rate of photosynthesis You arc going to plan and carry out an experiment to investigate this qur•Aion: Is there a correlation Irtwecn fight intensity and the ratc of phcnosynthcsis? A correlation is a relationship If there is a correlation between tight intensity and photosynthesis, then we would expx•t that changing the light intensity rxsult in a change in the rate of photosynthesis. 1 2 3 4 5 6 Write out your plan for your exvx:rirncnt. J lcre am some ideas you can use- • You can use a watc.r plant likc the one that you used for Activity I .3A. • measure the rate of photosynthesis, you can measure how much gas the [Aant gives off in a certain length of time- example, you can measure tbc depth of gas that oollccts in the tube in one hour. For a quicker expcrirncnt, you can o-mnt how many bubUes thc weed gives offin onc minute. If you do that, then you don't need a funnel or test tutx: to collect the gas. • To give the plant a high light intensity, you can place a larnp close to the plant. a lower light intensity place the lamp furthcr away • 'l carefully about all the variaHcs that you must kccp the samc in your experiment. • Ikcidc whcthcr pu should do scveral repeats for cach light intensity, so you can calculate a me-an for each one- Predict thc results you expect to g:t, and explain Check your plan with your teacher Ixfore you begin. Now carry out your experiment. Make changes to pur plan T pu think can unpreme it. Record and display your results so somconc else can easily undcrstand tbcrn. Write down a shon conclusion to your c-xFirncnt, and compare pur results with your predictions. Is there a correlation between light intensity and the rate of photosynthesis? The higher the light intensity, the greater the rate of photosynthesis.
  15. sunlight e 115 bell jar balsam plant concentrated sodium hydroxide solution Why the balsam plant can't carry out photosynthesis? Because the carbon dioxide in the air is absorbed by the sodium hydroxide solution Photosynthesis is a process by which the in green plants absorbs and to make food from

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