Class 12 English NCERT Solutions Chapter 4 Poem - A Roadside Stand - Free PDF Download
FAQs on NCERT Solutions for Class 12 English Flamingo Chapter 4 A Roadside Stand
1. What are the main stages of the cell cycle described in Class 11 Biology revision notes?
The cell cycle includes interphase and mitotic (M) phase. Interphase is subdivided into G1 (growth), S (DNA synthesis), and G2 (preparation for mitosis), while the mitotic phase consists of mitosis and cytokinesis. Most of the cell’s time is spent in interphase, making it crucial for replication and growth before division.
2. How do mitosis and meiosis compare in terms of outcomes and biological significance?
Mitosis produces two genetically identical, diploid daughter cells and is essential for growth, repair, and asexual reproduction. Meiosis creates four genetically varied, haploid daughter cells, maintaining chromosome number and promoting genetic diversity in sexual reproduction.
3. Why is interphase considered the most critical part of the cell cycle for students to revise?
Interphase is the phase where the cell grows, performs normal functions, and duplicates its DNA. As it precedes division, errors here can lead to genetic instability. Understanding interphase helps in grasping how cells prepare for accurate division, a key concept for Class 11 examinations.
4. What key processes occur during each stage of mitosis according to CBSE Class 11 revision notes?
The mitosis process includes the following stages:
- Prophase: Chromatin condenses into chromosomes, and the nuclear membrane dissolves.
- Metaphase: Chromosomes align at the cell’s equatorial plate.
- Anaphase: Sister chromatids separate and move to opposite poles; it is the shortest stage.
- Telophase: New nuclear membranes form around chromosomes; cytokinesis follows, dividing the cytoplasm.
5. How does meiosis ensure genetic variation in sexually reproducing organisms?
Meiosis introduces genetic variation through two mechanisms—crossing over during prophase I (exchange of DNA between homologous chromosomes) and independent assortment (random separation of chromosomes). This leads to diverse combinations in offspring, which is crucial for evolution and adaptation.
6. What is the significance of the G0 phase in the cell cycle, as highlighted in Class 11 notes?
The G0 phase is a resting state where cells exit the active cell cycle and do not divide. Cells like neurons may stay in G0 permanently. This phase is important for controlling cell proliferation and maintaining tissue stability.
7. Which revision strategies are most effective for mastering Chapter 10: Cell Cycle and Cell Division?
To revise effectively:
- Focus on diagrams of the cell cycle, mitosis, and meiosis.
- Learn key terms and concepts sequentially.
- Use concept maps to connect stages and outcomes.
- Practice previous years’ questions related to this chapter.
- Review summary points at the end of the notes for quick revision.
8. What common misconceptions should students avoid while studying cell division for CBSE exams?
Students often confuse mitosis with meiosis; remember, mitosis produces identical cells for growth/repair, while meiosis generates gametes with half the chromosomes. Also, note that chromosome number remains constant in mitosis but is halved in meiosis.
9. How does the process of cytokinesis differ between plant and animal cells?
In animal cells, cytokinesis occurs by constriction of the cell membrane (cleavage furrow), whereas in plant cells, it involves the formation of a new cell plate in the center of the cell due to the presence of a rigid cell wall.
10. Why is understanding the cell cycle and cell division important for higher studies in Biology?
A thorough grasp of the cell cycle and cell division forms the foundation for advanced topics like genetics, molecular biology, cancer biology, and biotechnology. This knowledge is also essential for competitive exams such as NEET and supports learning in future academic years.











