Question

Cell its structure and function in 9th class main points

Answer 1

hello friend...

Here is your answer -
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CELL

Cell is the basic, functional and structural unit of life. They are also called as "building blocks of life".
The membrane bound smallest living structure consist of a cytoplasm which is enclosed by a membrane and contains several biomolecules like proteins, nucleic acids, etc. is known as CELL.
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Type of Cell -

1. PROKARYOTIC CELLS -

✓ These cell are without nucleus.
✓ DNA is naked and lies variously coiled in the cytoplasm commonly known as Nucleoid.
✓ Nuclear membrane absent.
✓ Cell wall may be present (in bacteria and cyanobacteria) or absent (in PPLO smallest organism).
✓ Flagella may present in some bacteria.
✓ Mitochondria, ER, Golgi apparatus, microtubules, microfilaments and centrioles absent.
✓ Ribosomes are 70s type.
✓ DNA content is very low.

2. EUKARYOTIC CELLS -

✓ Well organised nucleated cells.
✓ DNA is organised into Chromosomes and chromatin.
✓ Nuclear membrane present.
✓ Cell wall present in plant cells and absent in animal cells.
✓ all cell organelles such as mitochondria, plastid, ER, Golgi apparatus, microtubules etc are present.
✓ DNA content is High.
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You can see the structure in the attached photographs.
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FUNCTION -
✓ Transportation of nutrients, respiratory gases, and wastes.
✓ It performs chemical reactions.
✓ They joins together to form tissue which further forms organs.
etc.
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hope it will help you...
best of luck...

Answer 2

Explanation:

All living organisms are made up of cells.

cell is the smallest structural and functional unit of any organism.