Scientific competition

1- ?Why does onion make you cry
2- ? What is the largest animal in the earth
3- ?What are Saturn’s rings made of
4- ? Which animal has the largest eye in the world
5- ? How does the camel walk in the desert easily
6- ? What does the plant need to make photosynthesis process
7- - : Mention one use for each of the following
- Sensitive balance. –Graduated cylinder.
8 -?Why do leaves change its color in the autumn
9-
? Why is a tomato considered fruit not vegetable
10- :- What happen when
a)heart contract. b) heart relaxes.

Onions release some chemicals when cut that vaporze into the air - when we inhale them, they irritate our sinus passages and eyes to the point of causing them to tear up.

You can prove this to yourself by holding your nose closed, breathing through your mouth and be near someone cutting onions.

Some onions cause more tearing than others - the 'hotter' the onion, the more tears. The 'sweeter' the onion, the less tears



the largest known animal on Earth is the blue whale



Saturn's rings are made of billions of pieces of ice, dust and rocks. Some of these particles are as small as a grain of salt, while others are as big as houses. These chucks of rock and ice are thought to be pieces of comets, asteroids or even moons which were torn apart by the strong gravity of Saturn before they could reach the planet

:face
:
The Giant Squid possesses among the largest eyes of any animal — as much as 15 inches (38 centimetres) in diameter, or about the size of a large dinner plate.

:bounce
The camel is dubbed the `ship of the desert'. It can adapt itself easily to the hot conditions due to various reasons. Its special adaptation features are its hump, long legs, long hair and special eyelids. The hump enables it to store food. Long hair on its body helps it keep warm in the cold desert nights. The long legs of the camel are strong and have powerful muscles allowing it to carry heavy loads for long distances. It walks at a medium speed. It has two toes on each foot. A hoof that looks like a toenail grows at the front of each toe. The camel walks on a broad pad that connects its two toes. This cushion like pad spreads when the camel places its foot on the ground. The pad supports the animal on loose sand in much the same way that a snowshoe helps a person walk on snow. The pad enables the animal to firmly grasp the earth. The toenails protect the feet from damages resulting from a bump. In the camel both legs on the same side rise and fall together. This leg action produces a swaying, rocking motion. Taller animals like the camel snap into a rotary walk more often than short animals. This helps them to shift the balance on one side of a body while the long legs on the other side are in a suspended phase. In the rotary motion on one side they put both legs forward and on the other side they are both back. Thick, broad sole pads and thick callosities on the joints of the legs and on the chest, upon which it rests in a kneeling position, enable it to withstand the heat of the desert sand. It is also able to close its nostrils against flying dust and its eyes are shielded by eyelashes. The camel has three eyelids and two layers of eyelashes to protect itself from dust and sun. To protect their eyes, camels have long eyelashes that catch most of the sand when desert winds blow sand on to their eyes. If sand gets into an eye a camel has a third eyelid to get it out. The extra eyelid moves from side to side and wipes the sand away. As the eyelid is very thin the camel can see through it. So a camel can find its way through a sandstorm with its eyes closed.





Photosynthesis is the process of converting light energy to chemical energy and storing it in the bonds of sugar. This process occurs in plants and some algae (Kingdom Protista). Plants need only light energy, CO2, and H2O to make sugar. The process of photosynthesis takes place in the chloroplasts, specifically using chlorophyll, the green pigment involved in photosynthesis.

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Sensitive balance :it's use for measure small masses while Graduated cylinder :iit's use for measure volume ir regular solid body
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The answer is because it has seeds. Now, here is what a lot of people are amazed to find out. If a tomato has seeds and is --technically or botanically speaking -- a fruit, not a vegetable,

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Your heart is a muscular organ that acts like a pump to continuously send blood throughout your body.

Your heart is at the center of your circulatory system. This system consists of a network of blood vessels, such as arteries, veins, and capillaries. These blood vessels carry blood to and from all areas of your body.

An electrical system regulates your heart and uses electrical signals to contract the heart's walls. When the walls contract, blood is pumped into your circulatory system. A system of inlet and outlet valves in your heart chambers work to ensure that blood flows in the right direction.

Your heart is vital to your health and nearly everything that goes on in your body. Without the heart's pumping action, blood can't circulate within your body.

Your blood carries the oxygen and nutrients that your organs need to work normally. Blood also carries carbon dioxide, a waste product, to your lungs to be passed out of your body and into the air.

A healthy heart supplies the areas of your body with the right amount of blood at the rate needed to work normally. If disease or injury weakens your heart, your body's organs won't receive enough blood to work normally.
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mona mosaad

ميرسى يا ميس
على الاسئله الرائعه

thx for the nice quistions mrs. mona