Write briefly the significance of mitosis and meiosis in multicellular organisms.

(N/A) $\Rightarrow$ Mitosis (equational division) is essential for the growth of multicellular organisms by producing genetically identical diploid daughter cells.
$\Rightarrow$ It helps in restoring the nucleo-cytoplasmic ratio,which is disturbed during cell growth.
$\Rightarrow$ It plays a crucial role in cell repair and regeneration,such as replacing cells in the epidermis,gut lining,and blood cells.
$\Rightarrow$ In plants,mitotic divisions in meristematic tissues (apical and lateral cambium) ensure continuous growth throughout their life.
$\Rightarrow$ Meiosis is a specialized cell division that reduces the chromosome number by half,resulting in haploid daughter cells.
$\Rightarrow$ It is essential for sexual reproduction as it produces haploid gametes,ensuring the maintenance of the species-specific chromosome number after fertilization.
$\Rightarrow$ Meiosis introduces genetic variation through recombination between homologous chromosomes,which is vital for evolution.
$\Rightarrow$ It involves two sequential nuclear divisions (Meiosis $I$ and $II$) but only one cycle of $DNA$ replication,resulting in four haploid cells.