The importance of food for plants and animals

- Food is the source of energy for living organism

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- Food supplies your body with heat energy needed to keep its temperature constant "37 oC in a normal state"

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- Food is necessary for performing more vital activities carried out by the living organism.

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- Food is necessary to keep our bodies healthy and protect them from some diseases.

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Plant makes its own food

- How does the plant obtain its food?
Plants do not eat food the way animal do.
The plant makes its own food through photosynthesis process.

Photosynthesis process:
Is a vital process that takes place in the plant "espacially the leaves" in the presence of:
- Light energy "sunlight"
- Water
- Carbon dioxide gas
- Chlorophyll.

Chlorophyll:
- Is a pigment which makes plants look green and absorb light energy.
Sunlight is essential for photosynthesis:

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Chlorophyll is necessary for photosynthesis process:
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- The variegated leaf:
It contains parts with chlorophyll "green" and other parts have no chlorophyll "white".

- Carbon dioxide is essential for photosynthesis:
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oxygen is produced during photosynthesis:
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- The importance of photosynthesis process:
- During photosynthesis plants make the food which animals and human beings need.
- Plants renew the air by replacing the oxygen used in vital processes.
- Plants remove the carbon dioxide form the air through photosynthesis.

- the green plants are producing organisms "producers" for their food.
- Plant leaves are food factories.
- Carbon dioxide enters the plant through stomata
Somata:
- They are small opening on both sides of the leaf.
- The number of stomata of the lower surface of the leaf is more than those of the upper surface of the same plant leaf.

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- Molecules of sugar "glucose" are joined together to form starch.
- Starch itself can change to fats or proteins in plant cells in the presence of some materials made by the plant and some salts.

The necessary groups of food for human body
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The balanced diet:
- Is the diet that provides the body with the necessary quantities of suitable foods and it contains proteins, sugars, starch, fats, mineral salts and vitamins.

The balanced diet conditions:
- It contains the main food groups.
- It suits age, temperature and kind of work.
- It is fit to eat "its colour, smell does not change ie. its expiry period has not been ended.

Cleanlines of food and utensisl used for preparing and handing

The sources of food pollution:
- Dirty utensils and hands used during preparation of food and handling.
- Dust particles and microbes, which are suspended in the atmospheric air.
- Flies and cockroaches.
- Soil residues and fertilizers.

Diseases caused by dirty foods:
1- Food poisoning
* Its symptoms:
- Vomiting and / or diarrhea.
- Fever "temperature rising"
- abdominal pains "cramps"

2- Gastroentritis

3- Parasites and worms such as "Ascaris"

Ascaris "Intestine worm":
- This is a kind of worms , which lives in the small intestin, feeds and shares with the infected person his digested food.
- A result, the infected person suffers from food deficiency diseases, such as anemia and feels lazy and tired after even a little work.

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- How can you keep your food clean?
1- Wash fruits and vegetables carefully with tap water before eating.
2- Cover the foods to prevent dust, cockroaches and flies away from foods.
3- Wash all utensils used in preparing and handling food with soap and water.
4- Wash hands and utensils used in eating with soap and water.

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Energy and its forms

Energy:
It is the ability to do work or to make a change.
Energy forms are:
1- Light energy
2- Chemical energy
3- Kinetic energy
4- Potential energy.
5- Thermal (heat) energy
6- Sound energy
7- Electric energy
8- Magnetic energy.

1- Light energy:
It is a property of light enables it to do work.
2- Chemical energy:
It is the energy produced due to chemical reactions.
3- Kinetic energy:
It is the energy gained by a body due to its motion
Examples of kinetic energy:
a- A moving car.
b- A bullet fired from a gun.
c- Running water.
4- Potential energy:
It is the energy gained by a body due to its position.
Example of potential energy
Water in a water fall

5- Thermal (heat) energy:

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6- Sound energy:
It is the energy produced due to the vibration of objects.

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7- Electric energy:
It is a form of energy because it causes the movement of objects which need electricity to move.

8- Magnetic energy:
Magnetism:
It is an invisible force that can make some things move towards or away from each other.

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1- Kinetic energy changes to potential energy then potential energy changes to kinetic energy:

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Natural and artificial sources of energy

Sources of energy:
Sources of energy are divided into:
a- Natural sources:
Such as, Sun - wind - waterfalls and fuel.
b- Aritifical (man-made) sources:
Such as, Electric power stations - dams and reservoirs.

First: Natural sources of energy:
A- The sun:
The sun is the main source of energy on the earth because:
1- The sun is responsible for photosynthesis process.
2- The sun is responsible for evaporation of water to form clouds.
3- The sun is the main reason for wind movement that carries clouds to the places when rain falls.

Uses of solar energy:
1- Heating water by solar heaters.
2- Generating electricity needed for satellites and space ships.
3- Desalination of sea water by evaporation and condensation.

B- The Wind:
It is used in:
1- Moving sail boats.
2- Generating electricity by using wind mills.

C- The waterfalls:
They are used in generating electricity by using turbines.

D- The Fuel:
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Fuel: It is a substance that can burn and give heat.
Kinds of Fuel:
1- Solid Fuel:
Such as, Wood - cotton straw - maize straw and coal.
2- Liquid Fuel:
Such as Kerosene - gasoline and diesel oil.
3- Gaseous Fuel:
Such as: Natural gas and butagas.

Second: Artificial sources of energy:
Electricity is the most important artificial sources of energy used by man and we can get electricity by different sources such as:
1- Electric power stations.
2- Dams and reservoirs.

بتمني ان يعجبكم

الف شكر لكى يا ولاء
مجهود رائع جزاك الله خيرا وزادك علما :078111rg3:

:av4056bb7jp3:

شكراً لمرورك

very good
ممتاز

شكراً للمرور

رائع جداااااااااااااااااااااااااااا

شكرا للمرور

thaaaaaaaaaaaaaanks

http://www.gmrup.com/out.php/i54383_untitled.bmp (http://www.gmrup.com)

:078111rg3:

الف شكر علي المجهود الرائع جزاك الله خيرأ

جزاك الله كل الخير عى هذا المجهود الرائع

بارك الله لكى ووفقك لكل خير
وبكل النجاح والتوفيق ان شاء الله

جزاك الله خيرا

ممتاز جدا جدا

اريد علوم الصف الثالث الابتدائى لغات وشكرا

الف شكر وجزاكى الله الخير

جزاك الله خيرا

انا باشكركجدا جدا انا كنت محتاجة الموضوع ده جدا علشان بنتى جزاك الله خيرا:022yb4:

الف الف شكر :022yb4::022yb4::022yb4:

مجهود رائع و لكن هذا المنهج الصف الخامس القديم و ليس الصف السادس
و شكرا على مجهودك مره أخرى

هذا هو المنهج القديم يا ريت تتعبى معانا وتقدمى الترم الثانى منهج جديد وشكرا على المجهود الرائع

جزاكم الله كل الخير

هى فين الملزمة دى اللة يكرمك