Ch 5 Bio Class 9
Important easy to understand Notes of Ch 5 Bio Class 9 English Medium written by Professor Sulman Arif Suib. These notes are very helpful in the preparation of Biology for students of the 9th class Biology English Medium and these are according to the paper patterns of all Sindh Book Boards.
Summary and Contents:
Topics which are discussed in the notes are given below:
- How were the chromosomes discovered?
- Define and briefly explain chromosomes.
- Briefly describe the formation of chromosomes.
- Name the types of chromosomes.
- What are chromatids?
- Define cell cycle. How many phases are cell cycle has?
- Explain the interphase and its sub-phases.
- Define Mitosis. Describe the phases of mitosis need and labelled diagram.
- What is the significance of Mitosis?
- Why mitosis is necessary for growth?
- What do you know about cell death? Define apoptosis and necrosis.
- Define meiosis. Briefly describe the phase of meiosis.
- What happens in the absence of meiosis?
- What is the significance of meiosis? (i) Constant number of chromosomes (ii) Responsible for genetic variation among the species.
- Explain phenomenon of non-distinction.
- What is the difference between mitosis and meiosis?
- Differentiate between the following: (i) Prophaase and Prophase I (ii) Prophase and Telophase (iii) Apoptosis and Necrosis.
- Why meiosis-I is called reduction and division?
- How number of chromosomes remains constant from generation to generation?
- Why interphase is called as phase of a high metabolic activities?
- Why interface between meiosis-I and meiosis-II is short?
- Important Short Questions Answers of Ch 5 Bio Class 9 Cell Cycle.
- Why meiosis-I is called reduction and division?
- Why mitosis is necessary for growth?
- How were the chromosomes discovered?
- Name the types of chromosomes.
- Why interface between meiosis-I and meiosis-II is short?
- Define cell cycle. How many phases are cell cycle has?
- How number of chromosomes remains constant from generation to generation?
- Why interphase is called as phase of a high metabolic activities?
- Define meiosis.