1. State the difference between
    a) Chromosome and Chromatid
    b) Centrosome and Centromere
    c) Aster and Spindle Fibres
    d) Haploid and diploid

2. "Gametes must be produced by meiosis for sexual reproduction." Why is it so ?

3. Define the following terms
    a) Chromosome
    b) Chromatin Fibres
    c) DNA
    d) Nucleosome
    e) Nucleotide

4. State the composition of Chromatin Fibres.

5. How many histone proteins are packed by DNA to form a Nucleosome ?

6. Which of the following bases : Adenine, Guanine, Cytosine, Thymine belongs to
    a) Purine
    b) Pyrimidine

7. Explain in short the process of replication of DNA.

8. What do you mean by the term - Gene?

9. How many bonds are present between -
    a) Adenine and Thymine
    b) Guanine and Cytosine

10. Explain the needs of cell division.

11. How cell division helps in reproduction.

12. In which type of cell division,
    a) The chromosome number is halved.
    b) The chromosome number remains same.

13. Explain two significance of mitosis.

14. What do you mean by the term - Karyokinesis and Cytokinesis ?

15. In which phase of Interphase, replication of DNA occurs ?

16. Which is the longest phase of Interphase ?

17. How many phases are there in Karyokinesis ?

18. Can the cell cycle go on endlessly ? Give an example to support your answer.

19. What is the difference between mitosis of plant cell and mitosis of animal cell ?

20. Does mitosis has any role in any form of reproduction ?

21. Differentiate between mitosis and meiosis.

22. Give one significance of meiosis.

23. Give two basic features of the following phases involved in cell division -
    a) Prophase
    b) Metaphase
    c) Anaphase
    d) Telophase

24. In which phase of Cell Cycle Mitochondria and Chloroplasts divide ?

25. Apart from nucleus which two other cell organelle have their own DNA material ?