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41 Cards in this Set
- Front
- Back
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Petiole |
The small stalk that attaches the leaf to the stem |
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blade |
leafs flat part that catches light to make food |
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Leaf |
An expanded outgrowth of the stem marked by a bud at the base of the petiole |
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Root |
Anchors the plant in the soil |
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Vein
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Contains tubes that carry water and food
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Equations for respiration |
Glucose +oxygen = Carbon Dioxide+Water |
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What does a plant need for photosynthesis ? |
Co2 Water and Light |
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Word equations for photosynthesis |
Co2 +Water = Glucose + oxygen |
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Where does Photosynthesis occur? |
In the palisade cells in the leaf |
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Where are chloroplasts? |
Inside the palisade cells |
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Why do plants need glucose |
Plants need glucose to grow its their food source |
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When does respiration occur ?
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During the day and the night
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When does photosynthesis occur ? |
During the day and not at night |
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What does respiration process in and out ? |
Carbon dioxide goes out and Oxygen comes in |
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What does photosynthesis process in and out ? |
Carbon dioxide in and oxygen out |
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what does Xylem Transport ? |
Water and Solutes |
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What does Phloem transport |
Food substances |
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What is transpiration? |
Transpiration is the process by which water evaporates from the leaves which results in more water being drawn up by the roots |
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What is the role of the stomata |
to control the gas exchange in the leaf |
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When does the stomata open and why? |
In the light the guard cells absorb water by osmosis become turgid and the stomata opens |
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When does the stomata close and why ? |
In the dark the guard cells lose water become flaccid and the stomata closes. |
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How does light affect photosynthesis ? |
as light increases the rate of photosynthesis will also increase up to maximum rate.
Above optimum light intensity the photosynthesis rate will not increase. |
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Why wont the light rate increase |
The chlorophyll pigment can only absorb light up to the optimum rate after that no matter how much light intensity increases the rate of photosynthesis will not increase |
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How does Temperature affect the rate of photosynthesis |
As the temperature increases in a plants environment the rate of photosynthesis will increase up to about 35c above this temperature photosy theis will decrease |
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Why will Photosynthesis decrease after 35c |
Above this temperature the stomata will close for water conservation and the photosynthesis enzymes start to denature |
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How does water effect photosynthesis |
Plants need a good supply of water for photosynthesis to occur |
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Why could the rate of photosynthesis be affected if there isn't enough water ? |
If the water entering the root hairs from the moist soil is not transported from the roots up the stem to the leaves fats enough the photosynthesis rate will decrease and the stomata on the leaf underside will close to prevent further water loss |
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How does carbon dioxide affect photosynthesis |
As the levels of carbon dioxide increases in a plants environment the rate of photosynthesis will increase up to a maximum rate. Above optimum co2 rate the rate of photosynthesis wont increase |
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Why wont photosynthesis increase above optimum co2 rate
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The chlorophyll cannot fix the co2 gas at a faster rate. co2 enters the plant through the open stomata on the leafs underside therefore the stomata needs to be open for photosynthesis to occur That means the plant cannot be water stressed which closes the stomata of the plant preventing the entry of co2 gas. |
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Why do leafs adapt ? |
To make photosynthesis more efficient |
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transparent epidermis |
Allows more light to reach the palisade cells |
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Palisade layer at top of the leaf containing most of the chloroplasts |
To absorb more light |
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Spongy layer with air spaces |
Allows carbon dioxide to diffuse from the stomata to the photosynthesizing cells adn to provide a very large internal surface area to volume ratio |
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Thin |
Short distance for carbon dioxide to difuse into the leaf |
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Contain Chlorophyll |
To absorb light from different parts of the suns spectrum
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Veins/Vascular Bundles |
To support the leaf and to transport water and carbohydrates |
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Stomata
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Allows carbon dioxide to diffuse into the leaf
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Guard cells |
To open and close the stomata depending on the conditions |
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What process changes co2 in the atmosphere into glucose in plants ? |
Photosynthesis |
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What process changes glucose back into carbon in the atmosphere ? |
Respiration |
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What do humans burn in cars which releases harmful amount of co2 into the atmosphere |
Fossil fuels |
