19.
a) There are two types of cell division - mitosis and meiosis.
b) The figure shows the process of cell division by the method of mitosis.
c) Somatic cells and stem cells divide using mitosis.
d) Mitosis is completed through two main steps – karyokinesis (nuclear
division) and cytokinesis (cytoplasmic division). Karyokinesis is completed
through 4 steps - Prophase, Metaphase, Anaphase and Telophase,
Cytoplasm is divided and two new daughter cells are formed. A notch is
formed at the equatorial plane of the cell which deepens gradually and two
new cells are formed. Thus, cytokinesis is completed.
e) Mitosis is necessary for the growth of the body, restoration of the
emaciated body, wound healing, formation of blood cells, etc.
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