INTRESTING FACTS BY KANIKA CHAUHAN

                       

    Interesting facts 

• The larger number of children born to a woman is 69.

According to a local monastery's report to the government in Moscow, between 1725 and 1765 Mrs. Vassilyev popped out 16 pairs of twins, seven sets of triplets, and four sets of quadruplets, over 27 separate labors. The total: 69 children.

You can only imagine how a present-day newspaper editor would react to such fecundity, especially given the tabloid clamor in recent years over octuplet mother Nadya "Octomom" Suleman, who has 14 children, or the Radford family in Britain, which has 16 kids – and a TV show.

• The world's most expensive spice is saffron 

Italian risotto, Spanish paella, and Indian curry all have something in common—saffron. People know the spice because of its very distinct flavor, bright color, and high price. Quality saffron can costSaffron's reputation as the most expensive spice in the world is because of the growing process. Only a small part of the saffron flower—the stigmata—is actually used for the spice. So it takes some 75,000 saffron flowers to make just one pound of spice. The stigmata are delicate, so harvesting and drying them is a costly, manual job. around $3,000 for just two pounds.

• Grapes explod when you put them in microwave  

The trio of researchers has published their work in the Proceedings of the National Academy of Sciences (PNAS).

They recreated viral videos that showed YouTubers cutting a grape in half, leaving only a sliver of skin connecting the two halves, and then microwaving the fruit.

Within seconds of being microwaves, the two halves of a grape would suddenly explode into a fireball, despite not containing any obviously flammable material.

A baby cannot taste salt until it is 4 months old.

  Infants’ ability to detect salt taste is mainly measured by the quantity the infant ingests, sucking patterns, and facial expression in response to ingestion of water solutions with different concentrations of salt. Because of the nature of these measurements, it is hard to distinguish between infants’ ability to detect sodium and infants’ preference for, or liking of, sodium.

Your brain uses 20% of the total oxygen and blood in your body.

A piece of brain tissue the size of a grain of sand contains 100,000 neurons and one billion connections—all talking to one another! You continue to make new neurons (brain cells) throughout life in response to mental activity and new learning (physical exercise helps too!)

Effects of force

 

 

force 

class -8 bio chapter- Cell structure and function

                           Class-8 

                Cell structure and function 

Cell definition:- 

A cell is defined as the structural and functional unit of life a cell can replicate itself independently hence they are known as building blocks of life.

Types of organisms on the basis of number of cells:- 

 there are two kinds of organisms on the basis of their cell.

1). unicellular organism:-  the organism that are made up of single cell are called unicellular organisms. example Amoeba ,Paramecium ,bacteria ,etc.

2). multicellular organisms:-  the organisms which are composed of a cell that assume function in coordinated manner as name that multicellular organisms . example plants ,human beings animals etc. 

• Robert hooke discovered the cell in 1665.

•Robert hooke observe the theme slice of cork under self designed microscope and noticed a honeycomb structure.

• he noticed that each box was separated from the other by partition  or a wall.

• he named these structures as cell which is derived from the Latin word called cella meaning small room.

"Cork is a part of the bark of a tree ".

Cell structure and function:- 

Though cells may differ in shape and size all of them may have the same basic structure referred to as the generalized cell structure for generalized cell a cell  has both living and nonliving parts the living parts have a definite shape structure and functional are called organelles.  the main parts of a generalized cell are cell membrane ,cytoplasm nuclear and mitochondria.

Cell membrane :- 

It is outer covering of a cell 

Function :-

A). It protects the cell from outside environment.

B).it gives the shape.

C).  allows water mineral and other selected substance to pass through it

2). Cytoplasm 

It is a transparent Jelly like material with fills the cell between nucleus and cell membrane most of the chemical reaction which keep the cell active take place in the cytoplasm and several organelles are embedded in cytoplasm.

3). Nucleus 

It is a large spherical organelle present in all the cells it is considered to be the brain of the cell nucleus is surrounded by a membrane called the nuclear membrane and it is filled with Semi solid substance called the nucleoplasm thread like structures called chromosomes are present in the nucleoplasm chromosomes carry  genes which transfer the characteristics of a cell to the new cell that are formed during cell division also present inside the nucleus is around granule called nucleus which contains a network of fibrous material called chromatin fibre.

Function of nucleus 

It is responsible for cell division 

It controls all metabolic activities of the cell. 

Transmission of all the characters forl one generation to another.

Mitochondria :-)

Are rod-shaped round organelles mitochondria perform the function of respiration as they generate energy for the cell they are known as powerhouse of the cell.

Vacuoles:-)

It is a fluid filled space enclosed in the membrane vacuoles store excess water useful mineral pigments and many other substance they also help in digestion and excretion in the unicellular organisms.

Golgi complex:-)

Golgi Complex are flat baggies tax placed in parallel positions on one another They Secrete  enzymes  which help in chemical reaction in living bodies.

Ribosomes:-) 

Ribosomes are small granules found freely in the cytoplasm or are located on endoplasmic reticulum they help in protein synthesis protein factories.

Lysosomes:)-

Lysosomes are small round bodies having enzymes to break down harmful bacteria.

Centrosome) -):

Centrosomes  are present only in animal cells that facilitates cell division.

Endoplasmic reticulum:)- 

It is a network of tube and channels and is involved in the synthesis storage and transport of cell products.

Plastids:)-

 they are present only in plant cells plastids contain certain pigments that have a specific role to play in the functioning of the plant depending on the pigment colour plastids are of three different kind

A. Chloroplast contain the green pigment chlorophyll which helps in the photosynthesis.

B. Chromoplasts:)- contain non green pigment That Give colours to flowers and fruit

C.  Leucoplasts :)- are colourless and store food in the form of Carbohydrates fats and proteins

Cell wall :-) 

It is present only in plant cells it is the nonliving part of the cell.

Function :)- 

It provides extra support and strength to the cell

It provides shape to the cell

It allows material to enter or leave the cell through tiny holes

 learn english tenses with kanika 

class 8th tenses 

welcome to ckclass8.com 

Tenses:- are he various forms of verbs. tenses tell us when the subject did something and how the action took place. tenses are classified as present, past, and future tense 

present Tense:- 

simple present tense:- 

is used to express the following:-

1.  A Habitual action	I walk to school everyday.
2.  A general truth.	The earth revolves around the sun.
3.  A future action that has a fixed schedule.	The mayor leaves for delhi tomorrow.
4.  A permanent situation.	Agra is on the banks of river Yamuna.
5.  Feeling/thought	Jo feels she will not be selected for the school drama.

 C:- complete each statement by using the verb in simple present tense:- 

1. The Rockies__________

2. Queensland______________

3. The Bullet Train_________________

4. Victoria Memorial________________

5. The French Revolution________________

6. Napolean Bonaparte______________

7. Fidel Castro_______________

8. Coffee Beans_______________

9. Malaysia__________

10. Boney M___________

 Present continuous:- tense 

is used to express the following 

1. An action planned for the future. 

example- I am going to Europe next week.

2. An action that is going on at the time of speaking.

example:- The girls are dancing on the stage. 

3. The action that may/may not be happening at the time of speaking. 

example:- I am writing a novel these days. 

B:-  Answer these questions in simple present tense or present continuous tense:- 

1. What does a cow eat?

2. Where do penguins live?

3. Who swing on tree?

4. What are you doing this sunday?

5. Who was your mother talking to over the phone?

6. What is the weather like today?

7. Which function is taking place in the school today?

8. Who is your English teacher?

9. What are you eating for dinner?

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 Here i have uploaded only till present continuous and simple present tense....

and some exersises are also given above you can try to solve them i'll add more information soon 

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you can tell me what do you want me to upload next ......