SCIENCE

7th

-BY PANKTI DAVE

This lesson covers various This lesson covers various diseases caused by diseases caused by

deficiency of VITAMINS & deficiency of VITAMINS & MINERALS in our diet.MINERALS in our diet.

A balanced diet and clean surroundings are necessary for good health.

A balanced includes all food constituents.

Body needs VITAMINS & MINERALS in very small amounts.

Deficiency of these can cause DISEASE.

VITAMINSVitamins has a specific & vital function in body.

Its essential for growth & development of body.

Disease caused by deficiency of vitamin C (ASCORBIC ACID)

Vitamins are required for joints, bones, teeth, gums etc.

Deficiency of vitamin C causes SCURVY ( in adults) WEAKENS LIMBS ( in children)

Sources of vitamin CSources of vitamin C

LemonsLemons

AmlaAmla

OrangesOranges

SweetlimeSweetlime

Leafy vegetablesLeafy vegetables

Fresh fruitsFresh fruits

DISEASE CAUSED BY DEFICIENCY OF VITAMIN D

Vitamin D is essential for Development of bonesAbsorption of calcium & phosphorous in body

Deficiency of vitamin D causes

RICKETS ( Young children). Bones become soft & get bent.

SOURCES OF VITAMIN D

Sunlight Cod liver oil Shark liver oil Egg Butter Cow’s milk

CALCIUM

Calcium essential for

FORMATION OF BONESDeficiency of calcium causes

Teeth to wear away

Makes BONE BRITTLE

Sources of calciumSources of calcium

Milk & milk productsMilk & milk products

WheatWheat Leafy vegetablesLeafy vegetables CabbageCabbage CarrotsCarrots OrangesOranges AlmondsAlmonds

PHOSPHOROUS

Phosphorous essential for

GROWTH & DEVELOPMENT of body

Deficiency of phosphorous causes

Loss of weight

Stunted growth

SOURCES OF PHOSPHOROUS

Cereals -Wheat -Bajra -Corn

Pulses -Udid dal -Moong dal

Egg yolk Milk Leafy vegetables

IRON

1. Iron is important CONSTITUENT OF BLOOD2. Gives blood RED COLOUR3. Supplies OXYGEN to body4. Essential for producing RBC’S in body

Deficiency of iron causes ANAEMIA

An anaemic person gets tired easily.

Pregnant women need more iron.

SOURCES OF IRONSOURCES OF IRON

WheatWheat

JaggeryJaggery

Leafy vegetablesLeafy vegetables

DatesDates

IODINEIODINEIodine is important for body Iodine is important for body

An important constituent of hormoneAn important constituent of hormone

→ ThyroxineThyroxine

Thyroxine is secreted by thyroid gland in neckThyroxine is secreted by thyroid gland in neck

Deficiency of iodine causesDeficiency of iodine causes GOITREGOITRE

Goitre leads to irregular growth of thyroid glandGoitre leads to irregular growth of thyroid gland

SOURCES OF IODINE

Use of iodised salt in food preparation

ILL EFFECTS OF INTOXICATING SUBSTANCES

Intoxicating substances are very harmful to human body

They can be at times fatal to health

INTOXIC SUBSTANCES INCLUDES

Chewing tobaco

Smoking cigarettes or bidis

Drinking alcohol

Taking drugs

Chewing tobaco or gutkha can cause

→ CANCER OF MOUTH

People who chew paan or tobaco, spit in public places.

The germs in the spit spread diseases.

Smoking cause deposition of TAR in lungs causing CANCER

Remember “SMOKING IS INJURIOUS TO HEALTH”

Drinking alcohol and taking drugs has harmful effects on NERVOUS SYSTEM

The person may loose his mental balance

Overuse of such substances can be fatal

SUMMARY

Balanced diet and clean environment are necessary for maintaining good health

Deficiency of vitamins and minerals cause many disease

Growing children have greater need of calcium

Intoxicating substances have adverse effects on nervous system

EVALUATION

Q. Which is the main source of vitamin D?

Ans: Sunlight is the main source of vitamin D.

Q. What are the ill effects of drinking alcohol?

Ans: Drinking alcohol has harmful effects on nervous system.

Q. Which disorder is related to lack of iodine?

Ans: Goitre is related to lack of iodine.

Q. Name the sources of vitamin C?

Ans: Lemon, Amla,Oranges,Sweetlime,Leafy vegetables,Fresh fruits are sources of vitamin C.