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Chloroplasts ppt may 29th
- 1. Learning Intentions “Today we are learning to identify the chloroplast and its structure and function.” Success Criteria “We will know we have learned this successfully when we can draw a labelled diagram of a stylised chloroplast, and describe the function of its parts”
- 2. CHLOROPLASTS: PLANTS’ FOOD FACTORIES •Are an organelle in most plant cells •Have their own membrane and DNA •Are the site of photosynthesis in plants
- 3. Chloroplast Structure – Stylised vs Real
- 4. Chloroplasts are the site of Photosynthesis: Sunlight + Water + CO2 Glucose + Oxygen
- 5. Chloroplast Structure Double layered lipid membrane- has a narrow space between Stroma – Watery liquid containing DNA, ribosomes and enzymes Granum –Stacks of thylakoids, (looks like a stack of pancakes) Thylakoids- Flat hollow membrane covered interconnected discs arranged in stacks Lamellae- Connecting tubes between thylakoids so membrane is continuous.
- 6. Structure of a Real Chloroplast
- 7. Grana – stacks of membrane-covered thylakoids, joined by lamellae. This membrane contains the green chlorophyll pigment which is important for photosynthesis.
- 8. Exercise: Draw a stylised chloroplast of your own in your bookand label the four main features: Membranes Stroma Thylakoids Granum Try and provide definitions for the parts of the chloroplast by studying your book
- 9. Learning Intentions “Today we are learning to identify the chloroplast and its structure and function.” Success Criteria “We will know we have learned this successfully when we can draw a labelled diagram of a stylised chloroplast, and describe the function of its parts”
Hinweis der Redaktion
- Chloroplasts contain the green pigment responsible for photosynthesis in plants. They are thought to be the descendents of a once free-living bacteria which was absorbed by plant cells millions of years ago so they are like a living bacteria inside the plant cell with their own DNA and ribosomes, so they can make their own proteins. They also control their own reproduction when the cell reproduces.
- You need to be able to draw a stylised chloroplast and label its main structures. Here we can see the stacks of thylakoids, which look like stacks of pancakes. These stacks are called granum. They are hollow sacs joined in a membrane-bound network, and this membrane contains the enzymes and pigment necessary for plant food manufacture to happen. We can also see the double-layered lipid membrane, with a narrow intermembrane space between. All these parts are contained in a watery fluid called the stroma, which has the chloroplast DNA and ribosomes suspended in it. The channels connecting the thethylakoids are called lamellae, and are part of the continuous membrane structure of the thylakoids (relate to E.R.)
- Class prior knowledge of photosynthesis? Photosynthesis happens in the chloroplasts, when a pigment called chlorophyll which is contained in the thylakoid membranes absorbs energy from incoming sunlight, and uses water and CO2 to produce its own food supply.(emphasise), which may be stored as starch granules. Plant starch is usually glucose. So its important to remember that Chloroplasts are the organelles of photosynthesis.The basic equation for photosynthesis you need to remember is Sunlight + H2O + CO2Photosynthesis happens in the chloroplasts, when a pigment called chlorophyll which is contained in the thylakoid membranes absorbs energy from incoming sunlight, and uses water and CO2 to produce its own food supply.(emphasise), which may be stored as starch granules. Plant starch is usually glucose. So its important to remember that Chloroplasts are the organelles of photosynthesis.The basic equation for photosynthesis you need to remember is Sunlight + H2O + CO2=> Glucose + O2
- This (stylised) diagram gives us a better view of the components of the thylakoid. –membraneous sacs in stacks (grana).The thylakoid stacks are designed so that the maximum surface area is exposed to sunlight, in order to efficiently make food for the plant.
- “There is another picture of a chloroplast in your books on page 138, but this one is a bit clearer. See the starch granules, which are glucose as a stored energy supply as a product of photosynthesis.”
- Sunlight enters the leaf, and hits the chlorophyll pigment housed in the thylakoid membrane. This light energy is transferred by chlorophyll pigments to enzymes floating in the stroma, and they build glucose molecules to store energy. They also free up Oxygen from the water molecules, most of which is passed out of the plant into the atmosphere.