Exploring Gas Exchange in Different Organisms

Exploring Gas Exchange in Different Organisms
Gas exchange in mesophytes Gases enter and leave plants mainly through the stomata in the leaves and the lenticles in stems. The main gas exchange surface is the spongy mesophyll layer found inside the leaves.. The spongy mesophyll cells are loosely packed thus increasing the surface area for gas exchange. Gases are needed for both respiration and photosynthesis. The spongy mesophyll layer is specially adapted for gas exchange. The cells are coated in a layer of water in which gases can dissolve. The cell walls are thin so reducing the distance for diffusion of gases into the cell.

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Structure and Function of Lipids in Plants and Animals

Structure and Function of Lipids in Plants and Animals
Lipids are the name given to a mixed group of organic compounds. The elements Hydrogen, Oxygen and Carbon are always found in Lipids. The difference between them and Carbohydrates is that they have a lower proportion of Oxygen in the molecule. Lipids are insoluble in water, but they are soluble in organic solvents, such as ether, acetone, chloroform or benzene. There are several parts in the group of Lipids: o fats and oils, o waxes, o phospholipids, o steroids (like cholesterol, oestrogen and testosterone), and some other related compounds. At room temperature, fats are solids and oils are liquids. Fats and oils are typically found in animals and plants. Fats are of animal origin, while oils tend to be found in plants.

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The Cost of Smoking to Health

The Cost of Smoking to Health
Over one quarter of the British adult population smoke. This is to say
they inhale smoke from cigarettes, cigars or pipes. The cost of this
affects many people, smokers and non-smokers alike in many ways,
through social, financial and most significantly health reasons.

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Renewable and Non-Renewable Fuels

Renewable and Non-Renewable Fuels
How electricity is generated Most of our electricity is made by generators but the generators don?t make electricity from nothing, they have to use some other kind of energy and convert it into electricity Most electrical generators work on principals that were discovered by Michael Faraday in 1831, he discovered that by moving magnetic fields created by magnets near to a coil of copper wire would create movement of electrons in the wire and the flow of electrical current, modern electrical generators use large electro magnets that are rotated on a shaft (rotor coils)inside a large stationary coil of wire(stator coils), as shaft turns the magnetic field around it induces a electrical current into the stationary coils fitted closely around it.

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Acid Rain and Its Effects on the Biosphere

Acid Rain and Its Effects on the Biosphere
Acid Rain: whenever I conjure up images of acid rain I always allude to huge, boiling-red raindrops falling from mean purple clouds on a path destined for destruction. I can see them spiraling down uncontrollably in fireballs of rage to the earth; it becomes very apparent. Perhaps my imagination has gotten the better of me here, but acid rain is definitely no sweetheart. Actually, acid rain looks like any other rain. Believe it or not, it does not have flaming tales on the end of it, but it can produce some serious risks to the world as we know it.

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Deforestation in Amozonia

Deforestation in Amozonia
The Amazon rainforest in Brazil is the world largest rainforest with over 30 million different species of plants, animals and insects. The rainforest used to cover of the earths surface but today only covers . This is mainly because some parts of the forest are being rapidly deforested because the forest is so useful to so many people. Deforestation provides benefits for many different companies which wish to make large amounts of money. Also Brazil owes large amount of Depts. and so the government believe that by developing the forest it will help to contribute towards the payment of these depts. Nevertheless it causes many problems for the ecosystems of the forest and the world. Deforestation in Amazonia has led to many conflicts between different groups of people. Some people argue that deforestation has its economic benefits and that developing the Amazon will have benefits for the people and economy of Brazil. However certain groups like world wildlife fund (wwf) are concerned because large amounts of animals and plant are becoming extinct. They argue that it is a global mistake and that in the long term this will only cause more problems for Brazil and the rest of the world.

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The Human Impact on Rainforests

The Human Impact on Rainforests
Human Impact on Rainforest is it a necessity? Rainforest are the
beautiful gift of Mother Nature. It consists of the most magnificent
species and plants in the world. 4.2% of the world?s animals live in
the rainforest. This statistic it self shows how bad it would be to
destroy such essential part of the worlds biodiversity. Nevertheless
there are still huge advantages of deforestation. But does this mean
2.47 acres of rainforest should be destroyed every single second? This
mean every second of the day size of two football field is lost
forever.

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The Human Impact on Rainforests

The Human Impact on Rainforests
Human Impact on Rainforest is it a necessity? Rainforest are the
beautiful gift of Mother Nature. It consists of the most magnificent
species and plants in the world. 4.2% of the world?s animals live in
the rainforest. This statistic it self shows how bad it would be to
destroy such essential part of the worlds biodiversity. Nevertheless
there are still huge advantages of deforestation. But does this mean
2.47 acres of rainforest should be destroyed every single second? This
mean every second of the day size of two football field is lost
forever.

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The Effect of Temperature on Amylase

The Effect of Temperature on Amylase
vWe have been asked to investigate what affect temperature has on amylase. hypothesis == I believe that the heat will affect the enzyme as the temperature is changed. I fell that the breakdown of starch will be quicker as the heat is increased. I think that the optimal temperature level will be 30-40 degrees, which is around body temperature. What is an enzyme? An enzyme is a biological catalyst that speeds up a chemical reaction without being destroyed itself. The enzymes amylase converts a complex sugar such as starch, into a simple sugar such as glucose: [image]starch glucose The enzyme amylase is found in the mouth and the small intestine.

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Comparing the Growth of Pea Plants Grown in the Light and in the Dark

Comparing the Growth of Pea Plants Grown in the Light and in the Dark
To compare the vertical growth and weight gain of pea plants grown in the light and in the dark. Background Knowledge: Photosynthesis forms the basis for this experiment. This is the process by which a plant makes food for itself from the raw materials around it. The energy needed for photosynthesis comes from sunlight, which is the variable for this experiment. The substance that absorbs sunlight is chlorophyll, which is mainly contained in chloroplasts. This energy is used to convert carbon dioxide (CO2) and water into sugars. This conversion creates the waste product oxygen, which is used by humans for breathing. Without being able to photosynthesise plants will stop growing and die. In a plant growing in the dark the chlorophyll will slowly be destroyed causing them to use their food reserves. Once the reserves have been used the plant will die. This is what happens in plants that are not grown in sunlight. Etiolation is a phenomenon that occurs in plants not being grown in sunlight, whereby the stem of the plant rapidly elongates to increase the probability of the plant finding light. In order to carry out this etiolation the plant must use its food reserves, so if the plant does not find light having used these reserves, it will die. Planning: I am planning to do an experiment over 3 weeks to find out the effect light has on the growth of pea plants.

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