1.Vacuoles are clear spaces in cells with water and other substances in solution.
Plant cells have large,prominent vacuoles , while animal cells have small ,temporary vacuoles ,if at all.It is bound by a covering called tonoplast . It contains cell sap which has ANTHOCYANIN in it.Function:Gives turgidity to the cell and stores food pigments,water and waste products.
2.The chromatin network in the resting stage of the nucleus condenses into fine threads called chromosomes.Function:They are the bearers of genes , the carriers of hereditary characters.
3.a>Unicellular organisms cannot be seen by the naked eye and are made up of a single cell.Eg-Chlamydomonas.There is only 1 cell which controls all the structural functions.cell division does not take place
Multicellular organisms can be seen by the naked eye and are made up of more than 1 cell.Eg-Human. There are many cells which perform their own functions and cell division takes place ,unlike in unicellular organisms.
B>Prokaryotic cells do not have a well defined nucleus/nuclear membrane and there are small ribosomes.The nuclear material is scattered in the cytoplasm.
Eukaryotic cells have a well defined nucleus and nuclear membrane and there are big ribosomes.Most of the nuclear material is present within the nucleus.Eg- All plant and animal cells.
c>Plant cells have cell wall , plastids, are comparatively bigger ,dont have centrosomes and centrioles,cytoplasm is pushed towards the periphery ,only a thin lining of cytoplasm.
Animal cells dont have cell wall,dont have plastids , are comparatively smaller,have centrosomes and centrioles,denser cytoplasm is present which fills almost entire cell.
4.Cell is the basic unit of living organisms because:The cell is the basic structural and functional living unit of all living organisms which has independent existence and new cells arise by the division of pre-existing cells.