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Food and Nutrition
1.
Food and Nutrition 1 ©
Jnana Prabodhini Educational Resource Centre © Jnana Prabodhini Educational Resource Centre
2.
All Living things
need food for growth and to repair the wear and tear of their body. Mostly all plants can make their own food , they are called autotrophs. All animals , plants like dodder and funguses are dependent on other plants or animals for food. They are called as heterotrophs. © Jnana Prabodhini Educational Resource Centre 2
3.
There are various
items in our food such as rice , bhakari , chapatis , pulses, sprouts , leafy vegetables , fruits , eggs , fish . There are starchy foods like chapati , bhakari , rice . Carbohydrates form a major part of these foods. © Jnana Prabodhini Educational Resource Centre 3
4.
We have protein
rich food like pulses , whole pulses , meat , fish We get salts and vitamins from fruits , cucumber , carrot , leafy vegetables. We get fats from oil and ghee. We get water from food we eat , drinking water , juices of fruits. © Jnana Prabodhini Educational Resource Centre 4
5.
All these nutrition's
are necessary for nurishment. A diet which includes all these constitutes in right proportions is called a balance diet. We get energy from carbohydrates, protines as well as fats. Vitamins are necessary for ensuring that all life processes are carrried out smoothly. The elements in salt are necessary for brining about the functions of enzymes. © Jnana Prabodhini Educational Resource Centre 5
6.
Eating food for
nourishment is called as ingest. Different living things ingest or take food in different ways. Ex. Multicellular animals ingest through mouth. Honey bee , butterfly ,mosquito not have mouth instead they have tube like part called proboscis. © Jnana Prabodhini Educational Resource Centre 6
7.
Unicellular animals like
Amoeba not have parts like hands , legs , mouth etc. It is a unicellular animals. It can take food from any part of the surface of it’s body. It engulfs , or surrounds the particle from all sides and ingests it into the cell. Then enzymes act on the food particle and it get digested. It leaves behind the undigested part and moves away using pseudopodia. © Jnana Prabodhini Educational Resource Centre 7
8.
Multicellular animals eat
food through mouth , it passes through alimentary canal and moves forward through different organs. As it moves forward , food constituents chemical substances which absorbs into the blood . © Jnana Prabodhini Educational Resource Centre 8
9.
Digestion means food
constituents are broken down by the action of enzymes into simple chemical substances . They are later absorbed into the blood , through blood it reaches to all parts of the body. Then it is used for the growth and repairs of the body. The process of food becoming the part of body is called as assimilation. © Jnana Prabodhini Educational Resource Centre 9
10.
A frog has
a tongue in its mouth . It is attached to the front of it’s mouth. When a frog sees an insect, it opens it’s mouth and throws out it’s tongue towards the insect and pulls the insect into it’s mouth. The insect is then carried through the oesophagus into the stomach, where it is digested and then assimilated. © Jnana Prabodhini Educational Resource Centre 10
11.
Human digestive system
has following steps The digestion starts from mouth. When morsel of food is put into mouth, it is chewed fine by the teeth. The salvia secreted from the salivary glands is mixed with the food an the mouth. The fat starts to break here. © Jnana Prabodhini Educational Resource Centre 11
12.
The bolus of
food is pushed forward from mouth and passes through the oesophagus into the stomach. There, it is acted upon by the digestive juices from stomach. Breaks down proteins , carbohydrates , and making food acidic. Further it passed to small intestine . © Jnana Prabodhini Educational Resource Centre 12
13.
In small intestine neutralization
of acidic food takes place. Substances formed by the breakdown of proteins and fats are absorbed in small intestine. Intestinal juices break down proteins and fats and are absorbed in to the body. Insulin created by pancreas regulates the level of sugar present in blood. Food is further passes to large intestine. © Jnana Prabodhini Educational Resource Centre 13
14.
Salt and mainly
water present in food is absorbed in large intestine. Further it passes to rectum and expulsion of faeces takes place through anus . Human digestive system consist of parts like mouth , oesophagus , stomach , small intestine , large intestine , pancreas , gall bladder and anus. © Jnana Prabodhini Educational Resource Centre 14
15.
Green plants can
prepare their own food. For this they use chlorophyll , sun light , carbon dioxide , and water and salt absorbed by roots. from soil. The process of preparing food by green plants is as followes Sun light Water + Carbon dioxide Food + Oxygen + Water Chlorophyll ( Carbohydrate) © Jnana Prabodhini Educational Resource Centre 15
16.
Plants uses carbon
dioxide for food preparation can be explained from following experiment. Place a potted green plant in a dark room for two days , so that it will use the food it has produced and new food will not be produced. © Jnana Prabodhini Educational Resource Centre 16
17.
Fix one leaf
in a glass bottle in such a way , that half of the leaf is inside the bottle where as half of the leaf is outside the bottle. Put potassium hydroxide pellets in it so that it will absorb carbon dioxide present in the bottle. © Jnana Prabodhini Educational Resource Centre 17
18.
Place the pot
in sunlight for the day. Then pluck the leaf off the plant at its stalk. Take some ethyl alcohol in a beaker and place the leaf in it . Place the beaker in boiling water and heat it. The chlorophyll dissolves in the alcohol and the leaf becomes colorless. © Jnana Prabodhini Educational Resource Centre 18
19.
Take some water
in a shallow dish and wash the colorless leaf in it. Change the water in the dish and add a few drops of iodine solution to it. The part of the leaf that was inside the jar does not become blue. The part that was outside the jar turns blue . It means that starch was formed in this part. The part inside the bottle received sunlight and water , but the potassium hydroxide in the bottle absorbs the carbon dioxide from the air in the bottle . Hence photosynthesis could not take place in side the bottle. © Jnana Prabodhini Educational Resource Centre 19
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