know more about constellations

Thousands of years ago,astronomers divided the stars into groups and drew imaginary pictures around them, such as that of a hunter or a bear.This made it easier for them to remember the stars patterns.Such a group of stars is called a constellation.The shape of a constellation is always remains the same.Constellations appear to move from east to west.Today,88 constellations are recognized by astronomers. Remember, however,that the stars in a constellation are actually unrelated.They are at widely varying distances from the Earth.However,when viewed from the Earth,they appear to be at the same distance and form a group.Some constellations are discussed below.

Ursa Major(Great Bear)
It contains seven bright stars

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some amazing facts about body

Chromosomes

1. A bigger organism has a larger number of cells than a smaller one-but the size of cells has no relation to the size of the organism
2. Chromosomes in the nucleus occur in matching pairs.There are 23 pairs of chromosomes in every normal human cell.In each pair,one chromosomes comes from the father and one from the mother.Each chromosomes in the nucleus has thousands of tiny genes.along its length-like the beads of necklace.The gene is the unit of inheritance in the living organism-it controls the transfer of hereditary characteristics from parents to offspring.Each gene carries the information about specific trait of an organism,for example,colour of eyes or the type of hair(curly or straight).
3. The cell wall in plants contains cellulose.This cellulose acts as roughage in our diet and therefore is very important for us.We cannot get roughage from animal foods,as animal cells do not contain a cell wall.

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