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Transcript of PHOTOSYNTHESIS!
What we learned in class!
All plants photosynthesis, whether they live in the Desert, Rainforest or UK Woodland. Plants adapt to their surroundings so they can photosynthesis.
How do Plants adapted to survive in different habitats?
As you move further away from the Equator, the temperature drops steadily, there is less rain and the sun is weaker. Its more difficult for plants to grow but they adapt so that they can live through drought and freezing winters
Plants and photosynthesis
Variation of plants
Distance from light source
Number of bubbles
We are investigating the effect of light intensity on the rate of photosynthesis
In the African Desert, the least distance from the light source is 17 bubbles, when the middle its 15, so it shows that the middle distance has more bubbles.
Carbon Dioxide + water
Glucose + Oxygen
6 Co2 + 6 H20
C6 H12 06 + 02
Even though the Desert is hot in the day many plants have adapted to survive. Plants achieve this by being drought dormant. This means that they have adapted either to use less water or store it and use it over time. The cactus is one such plant (succulent) that stores water in fleshy stems, leaves or roots. Other plants have an annual life span so they direct all their energy into bearing seeds.
How do plants Photosynthesis?
Plants make their own food by the process photosynthesis. Chlorophyll, the green pigment found in chloroplasts, traps light energy from the sun. The plant also takes in raw materials from the environment, water through it roots and carbon dioxide moves into the stomata by diffusion. Glucose is made and oxygen which is released into the atmosphere again by diffusion.
In the rainforest it is very humid all year round. Average rainfall is very high which creates a very unique environment which plants have to adapt too to survive.
The leaves on the plants often have a waxy surface with pointed tips at the ends, like a heart shape, to enable excess water to run off easily. This is important in such a humid environment because it stops the growth of algae, which is left to grow would block out the limited sunlight that can get through the dense foliage and reduce the plants ability to photosynthesize.
Other plants arrange themselves at different angles to ensure they get all the sunlight possible.
Photosynthesis takes place in the leaves which have a chemical called chlorophyll which makes leaves look green.
Its produced in leaf cells throughout the growing season when its sunny and has an essential role in photosynthesis.
Plants need warmth and sunlight to make chlorophyll, but bright sunlight destroys it, so in summers the sunlight needs to be continuous to keep the chlorophyll in the leaves. When there is little or no sunlight chlorophyll is not produced and leaves will change colour and die and fall.
The process of photosynthesis!
Plants take in sunlight and water and let out oxygen!
A leaf is made up pf a variety of layers. The top layer, the cuticle, is waterproof and helps reduce the amount of water a leaf loses through evaporation. The next layer is the upper epidermis which is just a single layer of cells that light goes straight through. The middle layer is called the palisade layer, where the mesophyll cells exist, and they contain chloroplasts which are key to photosynthesis. The lower epidermis is a thin layer that has a large number of holes, called stomata, that allow gases to move in and out of the leaf.
Structure of a leaf!