Photosynthesis:what’s in a leaf – Flashcards
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What are the reactants for photosynthesis?
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CO2 and water
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Where do these reactants enter the leaf?
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CO2 enter through the underside of the leaf. Water enters through the central vein.
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What are the products of photosynthesis?
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Water, Oxygen, Glucose
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From where do the products leave the leaf?
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Oxygen and water vapor exits from the underside of the leaf and glucose exits through the veins.
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Categorize all the components involved in photosynthesis as either matter of energy
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Energy: Sunlight...Matter: CO2, water, chlorophyll, glucose, oxygen
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How does the placement of veins help to carry out their function of transporting materials to and from the leaf?
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All cells are near a vein and can obtain water and release glucose quickly
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Which kinds of cells have chloroplasts in them?
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Palisade mesophyll, spongy mesophyll, guard cells
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Remembering the function of chloroplasts, in which parts of the leaf is photosynthesis taking place
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Most photosynthesis occurs in the palisade mesophyll, some occurs in the spongy mesophyll and guard cells
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Which layer of the inside of a leaf give it its green color?
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The palisade mesophyll has the most chloroplast and therefore the most green pigment chlorophyll give leaves their green color
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Through which layer does light energy travel to reach the palisade mesophyll
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Cuticle and upper epidermis
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How would the cylindrical shape of the palisade mesophyll cells increase the amount of photosynthesis that the leaf can carry out?
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Cylindrical shape allows more cells to be place into the space which allows for more chloroplasts and therefore more photosynthesis to occur.
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What would be the advantages to having no chloroplasts in the cells of the spongy mesophyll?
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Fewer chloroplasts in the spongy mesophyll because most of the light energy is absorbed by the chloroplasts of the palisade mesophyll.
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Suppose there were many chloroplast in the cells of the upper epidermis. How would that change the amount of sunlight reaching the chloroplasts in the palisade layer?
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If the upper epidermis had chloroplasts they would absorb most of the energy from sunlight and less light would reach the palisade mesophyll chloroplasts.
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Considering its locations and your previous knowledge of the word, what do you think might be the function of the epidermis?
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Epidermis covers and protects the cells and tissues inside the leaf.
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What is the purpose of having a water-tight covering?
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They waxy cuticle keeps water inside the leaf cells. Tis water is then used for photosynthesis.
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What structure is found between guard cells?
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The Stoma
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How would you describe this structure?
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A stoma is an opening in the underside of the leaf (Stoma=many openings)
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How would this affect the ability of the leaf to retain water especially in dry conditions?
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If the stomata are open in dry conditions then the leaf could lose water vapor and dehydrate/dry out. Less water for photosynthesis and so the rate of photosynthesis and glucose production would decrease.
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Suggest a way in which the stoma and guard cells arrangement might work to control the amount of water that is leaving the leaf.
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The guard cells regulate the opening and closing of the stomata.
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What is the relationship between the stoma and an air space?
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A stoma opens into the airspace inside the leaf.
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What gases might you find in the air space?
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Carbon dioxide, oxygen, water vapor.
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During the time that stomata are closed, gases cannot enter of leave, explain how this would affect the plant's ability to do photosynthesis?
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If the stomata are closed carbon dioxide cannot enter the leaf and photosynthesis will slow down because there isn't enough CO2.
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How would the cuticle and stomata work together to maintain a leaf's function?
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The waxy cuticle prevents the entire leaf from losing water from it surface and dehydrating: when the stomata close they prevent water loss from inside the leaf. The leaf is now totally sealed off.
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Trace the path for reactants for photosynthesis as they enter the leaf.
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CO2- Enter though the stomata -air spaces-palisade mesophyll-chloroplasts H2O-Enters roots-xylem in veins-palisade mesophyll-chloroplasts Light Energy-passes through cuticle and upper epidermis chloroplasts
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Trace the path for products as the exit the leaf.
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O2-Exits through the stomata Glucose-Exits through the phloem in the veins H2O-Exits trough stomata
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Where might water be stored for later use in the process of photosynthesis?
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IN the large central vacuole
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What might plant cells do with the sugars made during photosynthesis?
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Send it to the mitochondria to be broken down to produce energy (ATP)
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How does having cells with walls help a leaf to absorb as much energy as possible?
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Cell walls give the leaves support so the leaf can be in a position to capture as much sunlight as possible.
