MCQ’s
Long Questions
Short Questions
Chapter 5 of Class 9 Biology, titled Cell Cycle, focuses on the process by which cells grow, replicate, and divide to form new cells. The chapter explains the different phases of the cell cycle and the significance of cell division in growth, development, and reproduction.
Key general concepts covered in this chapter include:
- Cell Cycle: The cell cycle is a series of stages that a cell undergoes as it grows and divides. It includes two main phases: interphase (where the cell grows and prepares for division) and the mitotic phase (where the cell actually divides).
- Interphase: This phase is further divided into three stages—G1 (growth), S (synthesis of DNA), and G2 (preparation for mitosis). During this phase, the cell grows and duplicates its DNA to prepare for division.
- Mitosis: This is a process of cell division that results in two identical daughter cells. It has four stages: prophase, metaphase, anaphase, and telophase, followed by cytokinesis (division of the cytoplasm).
- Significance of the Cell Cycle: The cell cycle is essential for the growth of an organism, the repair of tissues, and in some organisms, asexual reproduction.
Understanding the cell cycle helps students grasp how organisms grow and maintain their tissues through the production of new cells.