Cell Civil Lines Ldh

DO YOU KNOW HOW MANY CELLS ARE THERE IN A HUMAN BODY? NEWLY BORN HUMAN BABY HAS TWO TRILLION CELLS WHILE AN ADULT MAN HAS ABOUT 100 TRILLION CELLS.

WHAT IS CELL? THE CELL IS THE BASIC STRUCTURAL AND FUNCTIONAL UNIT OF PLANTS AND ANIMALS.

CELL WAS DISCOVERED BY ROBERT HOOKE IN 1665. IN 1674 ANTOY VAN LEEUWENHOEK WAS THE FIRST WHO OBSERVED FREE CELLS SUCH AS BACTERIA PROTOZOA AND RBC UNDER HIS OWN DESIGNED SIMPLE MICROSCOPE.

CELL ORGANELLES • • • • • • • •

CELL WELL CELL MEMBRANCE MITOCHONDRIA LYSOSOMES ENDOPLASMIC RETICULUM RIBOSOMES NUCLEUS CENTRIOLES CLICK ME

TYPES OF ORGNISMS ON THE BASIS ON CELL NUMBER

UNICELLULAR eg. Amoeba MULTICELLULAR eg.Algae

CELL DIVISION ON THE BASIS OF THEIR NUCLEAR ORGANISATION PROKARYOTIC CELLS 1.Small in size 2.Only single DNA strand is present 3.Nucleolus is absent 4.Cell division by fission or budding

EUKARYOTCELLS 1.Large in size 2.Several DNA strands are present 3.Nucleolus is present 4.Cell division by mitosis or meiosis

Animal and Plant Cell • Animal cells are smaller in size • Cell wall is absent • Plastids are absent • Vaculoes are small in size

• They are larger in size • Cell wall is present plastids are present • Vacuoles are large

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CELL DIVISION

KARYOKINESIS

MITOSIS

CYTOKNESIS

MEISOS

PROPHASE METAPHASE ANAPHASE TELOPHASE

FIRST MEIOTIC DIVISION

SECOND MEIOTIC DIVISION