leaves and photosynthesis. the leaf i can state that leaves are adapted to photosynthesise...
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LEAVES AND PHOTOSYNTHESIS
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The Leaf
I can state that leaves are adapted to photosynthesise efficiently
I can describe the basic structure of a leave.
Wednesday 2nd May 2012
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Some ways to improve my level
• Read all the question and the paper.
• Give the question some thought
• Use correct key words as often as possible
• Read the graph to the point do not round or approximate.
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What do plants need?
1. Sunlight – the plants source of energy2. Chlorophyll – the green stuff which makes
plants look green. 3. Water – travels up from the roots. 4. Carbon dioxide – diffuses in through the holes
in the leaves. Do plants need oxygen?
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Question• What is the difference between respiration
and photosynthesis?
Respiration video.
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Photosynthesis1. Photosynthesis is the process where ________ make their
own _______. 2. Plants make food which is in the form of g________e.3. Plants need four things to be able to photosynthesise. They
are _______ (from the roots), ______ (through the leaves), __________ (source of energy) and _________ (make plants look green).
4. The word equation for photosynthesis is: ____ _____ + _____ _______ + _______
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Leaves work in a similar way to the solar cell. They both need a
lot of light energy to work.
Photosynthesis takes place in the chloroplasts inside the leaf
cells.Can you tell me the word
equation for Photosynthesis?
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Chloroplasts contain chlorophyll, a green pigment that takes in energy
from the sunlight.
All green parts of plants are able to photosynthesis because they
contain chlorophyll.
What are products of Photosynthesis?
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Electron microscope image
Can you tell me why the leaf is not solid?
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Structure of a leaf
PALISADE LAYER
SPONGY LAYER
STOMATA
CUTICLE
VEIN
AIR SPACES
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How are palisade cells specialised?
• Lots of chloroplasts, which contain chlorophyll to catch light energy.
• Long and thin, so they pack closely together to collect as much light as possible.
• They are at the top of the leaves, to get as much light as possible.
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How does the carbon dioxide get inside the leaf?
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Electron microscope image of the underside of a leaf.
Close up of a stoma on the under side of a leaf
What is this for?
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Stoma is a small holeIts size is controlled by 2 guard cells What is their function?
closed open
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Stoma function is for gas exchange in the leaf
Carbon dioxide
oxygenGuard cell
Provided plant is photosynthesising
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Key points• Leaves are usually very ……. so that
sunlight and carbon dioxide can pass through easily
• Broad, flat surface of a leaf ………… the surface area, allowing ……….. sunlight and carbon dioxide to reach cells
• Stomata allow …......... ………. to diffuse into the leaf and oxygen to diffuse out of the leaf
• Veins ……... water and minerals around the plant
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Investigating photosynthesis – apparatus
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Investigating photosynthesis – experiment
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Investigating photosynthesis – results