🚀 Master Cell Cycle & Cell Division: class 10 icse Selina Ultimate Question Set for Exam Success! 🌟

ICSE CLASS 10 ICSE CLASS 10 BIOLOGY BASTRONAUTWAY SirBikramSutradhar Bikram Sutradhar GrandMaster Bikram Sutradhar selina biology solutions ICSE Biology Selina Solution

📚 Ace your exams with this comprehensive question set on Cell Cycle & Cell Division! Includes definitions, reasoning, distinctions, abbreviations, and concept-based MCQs to boost your understanding. Perfect for ICSE, CBSE, and competitive exams! ✅💡

Comprehensive Question Set on Cell Cycle and Cell Division

Section A: Fill in the Blanks

1. The three components of a nucleotide are ____________, ____________, and ____________.
2. The chromosome count is reduced by half during ____________
3. Chromosomes align at the equatorial plane during the ____________ phase of mitosis.
4. Chromatin fiber consists of DNA and ____________.
5. The two identical chromatids of a chromosome are connected at the ____________.
6. The discovery of DNA’s structure was first made by ____________.
7. DNA strands wrapped around histone proteins form a structure known as ____________.
8. A specific sequence of nucleotides present on a chromosome is called a ____________.
9. The stage during which DNA duplication takes place is ____________.
10. The type of bond that links complementary nitrogenous bases in DNA is called a ____________.

Section B: Multiple Choice Questions (MCQs)

1. The chromatin material is composed of:
   a) DNA only
   b) DNA and histones
   c) Histones only
   d) Nucleotides
2. The term “chromosome” literally means:
   a) Inherited bodies
   b) Twisted threads
   c) Coloured bodies
   d) Shining threads
3. The process that reduces the chromosome number by half occurs in:
   a) Only in the testes
   b) Only in the ovaries
   c) Both in ovaries and testes
   d) All cells in the body
4. The synthesis phase (S phase) of the cell cycle is named so because:
   a) RNA is produced
   b) Proteins are generated
   c) DNA is replicated
   d) Glucose is manufactured
5. The correct sequence of mitosis phases is:
   a) Prophase, Metaphase, Telophase, Anaphase
   b) Prophase, Metaphase, Anaphase, Telophase
   c) Anaphase, Telophase, Prophase, Metaphase
   d) Telophase, Anaphase, Prophase, Metaphase
6. New cells are not produced for:
   a) Growth
   b) Movement
   c) Repair
   d) Replacement
7. Chromosomes duplicate during which phase?
   a) M phase
   b) G1 phase
   c) S phase
   d) G2 phase
8. Triple hydrogen bonds are present between:
   a) Adenine and Thymine
   b) Adenine and Cytosine
   c) Adenine and Guanine
   d) Guanine and Cytosine
9. In a human male body, the number of autosomes is:
   a) 23 pairs
   b) 22 pairs
   c) 1 pair
   d) 46 pairs
10. The main reason for genetic variation during cell division is:
    a) Mutation
    b) Crossing over
    c) Karyokinesis
    d) Cytokinesis

Section C: Very Short Answer Questions

1. Name the Following:

A]The repeating subunits that make up a DNA strand.

B]The complex that results when DNA is coiled around histone proteins.

c) The type of bond joining complementary nitrogenous bases.
d) The three components of a nucleotide.

2. Answer the Following:

1. A One cell undergoes mitosis, while another  B cell goes through meiosis.

. How many daughter cells will be produced?

• Cell A: ____________
• Cell B: ____________

3. Match the Following:

4. Fill in the Blanks:

2. a) DNA duplication takes place in the ____________ phase.
   b) Mitosis occurs in ____________ cells.
   c) Meiosis occurs only in ____________ cells.
   d) Human sperm and egg cells contain ____________ chromosomes each.
   e) During chromosome alignment in meiosis, ____________ chromosomes arrange themselves in pairs.
   f) During genetic recombination, non-sister chromatids of homologous chromosomes attach at the ____________.

Section D: Short Answer Questions

1. Define the Following Terms:

a) Chromosome
b) Gene
c) Cell division
d) Chromatid
e) Aster

2. Give Reasons:

· a}  Why is meiosis necessary for the formation of gametes in sexual reproduction?

·  b} What makes meiosis known as a type of division that reduces chromosome number?

c) Why do children of the same parents differ from each other in certain aspects?

3. Differentiate Between:

a) Cytokinesis and Karyokinesis
b) DNA and RNA
c) Nucleosome and Nucleotide
d) Centrosome and Centromere
e) Haploid and Diploid cells

4. Write the Full Forms of the Following Abbreviations:

a) DNA
b) RNA

Section E: Identify the Odd One Out & Give the Reason

1. Adenine, Guanine, Adrenaline, Thymine (Hint: Which one is NOT a nitrogenous base?)
2. Pentose sugar, Histones, Phosphate group, Nitrogenous bases (Hint: Which one is NOT a component of a nucleotide?)
3. Metaphase, Anaphase, Interphase, Telophase (Hint: Which one is NOT a mitotic phase?)
4. G1 phase, M phase, G2 phase, S phase (Hint: Which phase is NOT part of interphase?)
5. Chromoplast, Chromosome, Chloroplast, Leucoplast (Hint: Which one is NOT related to DNA?)

Section F: Correct the Following Statements

1. The four nitrogenous bases in DNA are Guanine, Thymine, Adrenaline, and Cytosine.
2. Genes are randomly arranged sequences of nucleotides on a chromosome.
3. A nucleotide consists of a sulphate, a pentose sugar, and a nitrogenous base.
4. Nucleosomes are groups of cysteine molecules wrapped in DNA.
5. If a cell contains 46 chromosomes, there will be 23 chromatin fibers in the nucleus during interphase.

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