Question

notes on cell chapter class 9

Answer 1

Cell
cell is the structural and functional unit of Living Organism.

UNICELLULAR ORGANISMS
the organism which is made up of only one cell is called unicellular organism. eg - amoeba, yeast, etc.


MULTICELLULAR ORGANISMS
the organism which is made up of many cells is called multicellular organism. example - human being, animal, plant.

DISCOVERY OF CELL
the word cell is derived from the Latin word cellular which means a little room. IM 1665 and English scientist Robert Hooke discovered cell first.

Prokaryotes
the organism which have committed and incomplete cell in your body structure is called prokaryotic cell

Eukaryotes

the organism which have advanced and complete cell in their body structure is xalled eukaryotes.


STRUCTURE OF CELL
cell consists of:-
1. Plasma Membrane.
2. Cell wall
3. Nucleus
4. Cytoplasm




PLANT CELL
1. they are larger than animal cell.
2. plastids are present.
3. cell wall are present.
4. large vacuole are present.
5. they lack centrosome and centriole.
6. lysosomes are absent.


ANIMAL CELL
1. they are smaller than animal cell.
2. plastids are absent.
3. cell wall are absent.
4. small vacuole are present.
5. they have centrosome and centriole.
6. lysosomes are present.



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Answer 2

Answer: cell = cell is a fundamental basic unit of life

Unicellular organism= a unicellular organism is made by single cell

Multicellular organism= multicellular of these are made by large number of cell

Cell wall= cell wall is non living and freely permeable and it is created by cell itself for the protection of its plasma membrane and cytoplasm

Cell organelles= some important examples of cell organelles are into plasmic reticulum ,Golgi apparatus ,lysosome ,Mitochondria ,plastid ,vacuoles.