Explore & Learn

*proteins are needed for muscles building and repairing worn out cells and tissues.

*muscles ,organs and even blood are made up of mostly proteins .

*if we do not eat proteins our body will not be able to repair damaged cells or build new ones

*The proteins from animal sources are know animal proteins plant

*The proteins from plant source are know as plant proteins.

*one gram of protein gives four kilo calories of energy (kcal)

*an adult needs 1 gm of protein for every kilo gram of body weight per day

*for example if shivali weight 52 kg then her protein requirement would be approximately 52 gms per day

function of proteins

.needed for making new cells in the body

.Help in repairing old and damaged cells

.Help in healing wounds.

.needed for making blood enzymes and hormones

sources

Animal sources

.meat,egg,fish poultry,milk,curd,cheese etc.

plant sources

.All cereals,pulses,d eas,soyabeen nuts especially ground nut etc.

.some changes are temporary while some others are permanent

.some changes produce new substance while others do not

.some changes are natural while others are made by human beings

.some changes are desirable to us but some changes are not desirable

slow changes

.changes which take place over a long period of time (hours days month year) are known as slow changes

Examples:

1.) growth of nail and hair

2.) changes of season

3.)germination of seed

Fast changes

.changes which take place within a short period of time (second or minutes) are known as fast changes.

Example:

1.)bursting of balloon

2.)breaking of glass

3.)bursting of fire crackers

4.)burning of paper

reversible changes

.changes which can be reversed(to back the orginal state) are known as reversible changes

1.)touch me not plant (responding to touch

2.)stretching of rubber band

3.)melting of ice

irreversible

.changes which cannot be reversed or to get back the orginal state are known as irreversble changes

Example:

1.)changes of milk into

2.)digestion of food

3.)making idly from batter

.The sun heats up the water from ocean,lakes and river and water changes into water vapour by the process of evaporation

.plants also lose water in the form of water in the form of water vapour from their leaves into the air by the process of transpiration.

.As the water vapour rises up into the air,it start cooling down and forms tiny water droplets come together to form clouds.

.when the clouds start getting heavy and cannot hold the water droplets anymore they fall back to the earth in the form of rain hail or snow.this process is called precipitation

.some of the water that falls on the earth seeps into the ground.

this water is available to us in the form of ground water.

.The sun starts heating up this water once again. this circulation of water is called water cycle

. full stop

, comma

? question mark

! Exclamation mark

Brackets

[ ] square bracket

" " quotation

/ Slash

_ Hyphen

: colon

; semi colon

The English has a system of symbols and signs known as punctuation

punctuation shows us to structure sentence and how each sentence should be read

Full stop

a

A full stop marks the end of a sentence

eg : she is a dancer .

comma

1 indicates a natural pause sentence or is used to separate items in a list

eg : stucey went to her friend amy`s house she loves to go there .

Question mark ( ?

Question mark Indicates the end of a question

eg how are you ?

Exclamation mark !

marks the end of a dramatic statement or sentences

.words expressing deep feelings

eg stop

Don`t ran to the round

Quotation mark

indicate direct speech

The teacher said Be friendly