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Title: Biology notes on Photosynthesis Experiments
Description: These are all the tests which are conducted on photosynthesis all the experiments to find the factors effecting rate of photosynthesis.
Description: These are all the tests which are conducted on photosynthesis all the experiments to find the factors effecting rate of photosynthesis.
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CLASS - 10 C
PHOTOSYNTHESIS NOTES
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HOW TO PROVE THAT LIGHT IS NECESSARY FOR PHOTOSYNTHESIS
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Get a potted plant keep it in dark room and destarch it
...
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Test the leaf for starch using iodine solution
...
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Light is necessary for photosynthesis
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Put the leaf in boiling water to
i) denature the enzymes and to prevent any further chemical changes
...
•
Photosynthesis- It is the fundamental process by which plants manufacture carbohydrates from
raw materials using energy from light
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Water
•
Absorbed through root hair cells in the roots by the process osmosis
...
•
3
...
•
FACTORS AFFECTING PHOTOSYNTHESIS
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Carbon dioxide
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Increase in carbon dioxide increases the rate of photosynthesis
•
WATER
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Lack of water slows down or stop photosynthesis
•
LIGHT ENERGY
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It is the source of energy for photosynthesis
...
•
Light is absorbed by chlorophyll pigment present in chloroplast
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•
TEMPERATURE
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Warmer temperatures are optimum for the action of enzymes in photosynthesis
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LEAF STRUCTURE
1
...
It is thin to obtain the passage of light to the inner
tissues of leaf, and to allow diffusion of gases to inside and outside of leaf easily
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2
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Transparent to allow light to penetrate them
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STOMATA – Are fine openings found in the epidermis to allow exchange of gases during
photosynthesis and respiration
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The number of stomata in the lower epidermis is greater than that in the upper epidermis
because the upper epidermis is exposed to accumulation of dust
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Each stoma is surrounded by two cells known as guard cells
The wall of the guard cell is thicker in the side facing the stomatal opening than the other side
therefore when the guard cell becomes turgid it curves causing the stomata to open
...
C- The chloroplast in the palisade cells are found close to the cell membrane to obtain water and carbon
dioxide easily
The palisade cells are elongated and carry more chloroplast
...
Has chloroplast but number is less
compared to palisade layer
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Phloem for translocation of food
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2
...
4
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Epidermal cells- Chloroplast absent
Guard cells – Chloroplast present a few
Palisade cells - More chloroplast – Maximum photosynthesis occurs here
Spongy mesophyll cells – Lesser number of chloroplast – Lesser photosynthesis
Vascular bundles – Chloroplast absent
GASEOUS EXCHANGE
Carbondioxide enters through stomata by diffusion into palisade and spongy mesophyll cells for
photosynthesis
...
•Experiment No
...
1
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Leave it for about 30 seconds
...
)
2
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Leave it until all the
chlorophyll has been dissolved out of the leaf
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The leaf then now is brittle
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4
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A black colour shows that the leaf contain
starch
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COMPILED BY J•Experiment No
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1
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Leave it in a cupboard for a few days, to de starch it
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Test one of its leaves for starch, to check that it does not contain any
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Using a folded piece of paper or aluminum foil, a little larger than the leaf, cut out a shape
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Don’t take
the leaf off the plant
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Leave the plant near a warm, sunny window, and test it for starch
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Experiment No
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1
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2
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Take special care that no air get into the flasks
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Rubber bung is smeared with Vaseline to make an air tight seal
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Leave the plant in a warm sunny window for a few days
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Test each treated leaf for starch
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4: To see if chlorophyll is necessary for photosynthesis
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De starch a plant with variegated (green and white) leaves
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Leave your plant in warm, sunny spot for a few days
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Test one of the leaves for starch
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Make a drawing of your leaf before and after testing
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1
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Make sure that the test tube is completely full of water
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Leave the apparatus near a warm, sunny window for a few days
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Carefully remove the test tube from the top of the funnel, allowing the water to run out, but not allowing the gas
to escape
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Light a wooden splint, and then blow it out so that it is just glowing
...
If it bursts into flame then the gas is oxygen
Title: Biology notes on Photosynthesis Experiments
Description: These are all the tests which are conducted on photosynthesis all the experiments to find the factors effecting rate of photosynthesis.
Description: These are all the tests which are conducted on photosynthesis all the experiments to find the factors effecting rate of photosynthesis.