🧬 Std 11 Biology – Chapter 10: Cell Cycle & Cell Division IMP FOR EXAM

🧬 Std 11 Biology – Chapter 10: Cell Cycle & Cell Division

📚 Topic: Interphase & Meiosis | 🕐 Time: 1 Hour | 📊 Marks: 25

📌 English Medi

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✨ Test Format

This short test focuses only on Interphase and Meiosis from Chapter 10 of NCERT Class 11 Biology. Designed especially for NEET aspirants and Science students, it checks your understanding through 2, 3, and 4-mark questions.

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🔍 Question Paper

📝 Section A (2 Marks Each) – [4 × 2 = 8 Marks]

1. What are the major events that occur during the G1 phase of interphase?
2. Mention any two major differences between G2 phase and S phase.
3. What is synapsis in meiosis? In which stage does it occur?
4. Define bivalent. How is it different from a tetrad?

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🧠 Section B (3 Marks Each) – [3 × 3 = 9 Marks]

5. Explain the significance of the S phase of interphase in terms of genetic material.
6. Describe any three important features of prophase I of meiosis.
7. Differentiate between meiosis I and meiosis II (any three points).

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🧬 Section C (4 Marks Each) – [2 × 4 = 8 Marks]

8. Describe the events that take place during metaphase I and anaphase I of meiosis.
9. Draw a well-labeled diagram of a metaphase I meiotic cell and write any two characteristic features of this stage.

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✅ Answer Key

✍️ Section A

1. G1 phase events: Cell grows in size, synthesizes RNA and proteins, and prepares for DNA replication.
2. G2 vs S phase:
   • S phase: DNA replication occurs.
   • G2 phase: Final preparation for mitosis; synthesis of proteins required for cell division.
3. Synapsis: Pairing of homologous chromosomes in prophase I of meiosis.
4. Bivalent vs Tetrad:
   • Bivalent: Two homologous chromosomes paired together.
   • Tetrad: Four chromatids formed from the bivalent.

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✍️ Section B

5. S Phase Significance: DNA replication occurs, ensuring each daughter cell gets an identical set of genetic material. Centrosome duplication also takes place.
6. Prophase I features:
   • Chromosomes condense.
   • Homologous chromosomes undergo synapsis.
   • Crossing over occurs at chiasmata.
7. Meiosis I vs Meiosis II:
   • Meiosis I: Reductional division; homologous chromosomes separate.
   • Meiosis II: Equational division; sister chromatids separate.
   • Crossing over only in Meiosis I.

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✍️ Section C

8. Metaphase I: Homologous chromosomes align on the metaphase plate.
   Anaphase I: Homologs separate and move to opposite poles.
   This ensures reduction of chromosome number.
9. Metaphase I Diagram: (Students to draw a cell showing bivalents aligned at the equator).
   Features:
   • Chromosomes arranged in pairs (bivalents).
   • Independent assortment can occur.

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📌 Final Thoughts

This paper is ideal for practice before exams or NEET prep. Understand the logic behind meiosis and interphase, not just the definitions.

🧪 Pro Tip: Draw diagrams clearly in long answers to score better in board exams!

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