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Ann Thankachan

on 22 November 2013

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Transcript of Photosynthesis

Photosynthesis is the process in which green plants and other organisms produce their food. For photosynthesis to take place, sunlight is needed. If there is no light, photosynthesis stops. This is what happens at night. For photosynthesis to happen, the plant needs this equation: Carbon Dioxide+ Water+ Nutrients= Glucose +Oxygen. Co2+ H2o--> C6H12O6+O2

In some habitats, photosynthesis may differ from the varied amounts of sunlight each plant receives. For example, Sahara Desert plants will have a much higher amount of photosynthesis than of the Amazon Rainforest because of the sunlight it receives. Desert plants tend to have spines rather than leaves as the plant stores water in the spines. The Amazon Rainforest doesn't receive as much sunlight below, however the tall canopies are adapted to be very tall in order to receive sunlight by being in the very top of the trees. Unlike the shurbs.
What's the difference between respiration and photosynthesis? The main difference is that photosynthesis occurs mostly in plants and some bacteria and respiration occurs in all living things.
Variation and Adaptation of plants.
What kinds of plant variation are there?

There is genetic variation and environmental variation.

Plants have genetic variation which is the way they look like because of their genetics. For example, an oak tree may look like an oak because it's parent tree was an oak.

However, a daisy from a sunny field might look different from a daisy on a rainy field. The daisy on the sunny might be a lot more colourful and would be able to photosynthesis better.
What's Photosynthesis?
How are plants adapted for photosynthesis?
Plants have many features which help them with photosynthesis. For example, plants have palisade cells which contain chlorophyll and the chemical reactions for photosynthesis takes place which creates starch in the form of glucose. Also, plant's leaves are flat and they have a large surface area to absorb as much sunlight as possible, a plants leaves are very thin thus gases can reach the cells easily, there are also very little holes in the leaf called stomata in which gases can go in and out. They also position themselves to face the sun and to also get enough carbon dioxide as possible.

Plants sometimes have poisons which help them to survive better in the wild and not get eaten by animals.
How are plants varied?

Plants tend to differ from each other. This is mainly because they come from different groups; just like us animals.
Plants have two main groups, vascular and non-vascular. These two groups then split into four different groups, Bryrophytes (mosses), Pteridophytes (ferns), Gymnosperms (Pines, Conifers) and Angiosperms (flowering plants).

Some plants are different because of their habitat. For example, plants in UK are quite delicate and they aren't poisonous. However, if you went to the Amazon Rainforest then the plants would be poisonous and big and colorful.

If a plants habitat was destroyed then the plant itself would die out unless it can quickly adapt to it's new environment.
Why is photosynthesis so important?
Photosynthesis produces oxygen as although the plant takes oxygen in, a more fraction of it is released as waste energy.

This is very helpful for us as it gives us air to breath in, however whenever we cut down trees, we are decreasing this. That is the problem with deforestation. Also, the rainforest can may have cures that could save some life-threatening diseases so if we destroy it, will lose out.

Why is chlorophyll
Chlorophyll is important to plants because they contain chloroplasts that carry out photosynthesis.
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