The Cytoplasmic Inclusions Of Certain Plant Cells

The Cytoplasmic Inclusions Of Certain Plant Cells

Question 1. Enumerate the various cytoplasmic cell inclusions.
Answer.

The cytoplasmic inclusions are nonliving and nonfunctional entities of cell cytoplasm. They do not take part in the cell metabolism.

Various types of cytoplasmic inclusions:

1. Glycogen
2. Lipid
3. Pigments
4. Secretory granules

Question 2. Describe the cell cycle in brief.
Answer.

The cell cycle is defined as a period of time taken by a cell to divide into two daughter cells. In most of the adult somatic cells, the cell cycle takes 20–24 hours. It is divided into four phases of different durations.

The four phases of the cell cycle occur in sequence as G1→S→G2→M.

• G1 phase (12 hours): It is the crucial period of the cell cycle during which the cell determines to undergo cell division. It is the period of synthesis of various metabolites required for cell division.
• S phase (6 hours): It is the period of DNA synthesis. It is also called the synthetic phase.
• G2 phase (4 hours): It is the period during which the fidelity of DNA replication is checked, and errors, if any, are corrected.
• M phase (2 hours): It is the period during which the cell actually divides.