Structure of Chromosomes Cell Cycle and Division MCQs Selina Solutions

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Structure of Chromosomes Cell Cycle and Division MCQs ICSE Class 10 Concise Biology Selina Solutions Ch-2. In this article you will get the solutions of MCQs Questions with hint as council latest syllabus. Visit official website CISCE for detail information about ICSE Board Class-10 Biology.

Structure of Chromosomes Cell Cycle and Division MCQs Selina Solutions

Structure of Chromosomes Cell Cycle and Division MCQs ICSE Class 10 Concise Biology Selina Solutions Ch-2

Board   ICSE
Subject  Biology
Class 10
Book Selina Concise
Chapter-2 Structure of Chromosomes Cell Cycle and Cell Division
Topics Solutions of MCQs with hint
Session  2024-25

MCQs on Structure of Chromosomes Cell Cycle and Cell Division

ICSE Class 10 Concise Biology Selina Solutions Ch-2

Que-1:  The chromatin material is formed of
  1. DNA only
  2. DNA and Histones
  3. Histones only
  4. Nucleotides

Sol:  DNA and Histones

Hint:  DNA surrounds a core of 8 Histones to form a unit called nucleosome. These nucleosomes coil to form chromatin fibres

Que-2:  The term “chromosomes” literally means
  1. Inherited bodies
  2. Twisted threads
  3. Coloured bodies
  4. Shining threads

Sol:  Coloured bodies

Hint: The chromo=  dyes and some = body

Que-3: The number of chromosomes in a certain type of cell division is halved. This kind of cell division occurs in
  1. only testis
  2. only ovary
  3. both ovary and testis
  4. all body cells

Sol: both ovary and testis

Hint:  Meiosis takes place in the reproductive organs such as testis and ovary pollen grain ovule.

Que-4: Synthesis phase in the cell cycle is called so for the synthesis of more of
  1. RNA
  2. RNA and proteins
  3. DNA
  4. Glucose

Sol:  DNA

Hint:  more DNA is synthesized and the chromosomes are duplicated.

Que-5: In which one of the following options the stages of mitosis have been given in correct sequence?
  1. Prophase, metaphase, telophase, anaphase
  2. Prophase, metaphase, anaphase, telophase
  3. Anaphase, telophase, prophase, metaphase
  4. Telophase, anaphase, prophase, metaphase

Sol: Prophase, metaphase, anaphase, telophase

Que-6:  The new cells are to be produced for all except:
  1. Growth
  2. Movement
  3. Repair
  4. Replacement

Sol:  Movement

Hint: New cells need to be produced for Growth, Repair, Replacement and Reproduction but not for movement

Que-7: The chromosomes are duplicated in :
  1. M phase
  2. G1 phase
  3. S phase
  4. G2 phase

Sol:  S phase

Hint: In Synthesis phase more DNA is synthesized and the duplicated.

Que-8:  Triple hydrogen bonds are present between :
  1. Adenine and Thymine
  2. Adenine and Cytosine
  3. Adenine and Guanine
  4. Guanine and Cytosine

Sol: Guanine and Cytosine

Hint: Triple hydrogen bonds are present between Guanine and Cytosine while Adenine and Thymine has double bond

Que-9:  In the cells of a human male body, the number of autosomes is
  1. 23 pairs
  2. 22 pairs
  3. 1 pair
  4. 46 pairs

Sol:  22 pairs

Hint: in Human total 23 pairs of chromosomes, in which 22 pairs are autosomes while last 23rd pair (1 pair ) is sex chromosome.

 Que-10:  The basis of genetic variation in the living organisms during mitosis occurs due to 
  1. Cell division
  2. Mutation
  3. Crossing over
  4. Karyokinesis

Sol:  Mutation

Hint: Mutations, or changes in the DNA sequence, are the most common cause of genetic diversity in living organisms during mitosis.

Que-11: After a mitotic cell division, a human female cell will have :
  1. 22 + X chromosomes
  2. 44 + XY chromosomes
  3. 44 + XX chromosomes
  4. 22 + XX chromosomes

Hint:  After mitotic cell division, the resulting daughter cells will have the same number and type of chromosomes as the parent cell. A human female cell has 46 chromosomes. Out of these 46, two are sex chromosomes (XX).

Que-12: The correct sequence of phases in interphase is:
  1. G1, G2 and S
  2. S, G2 and G1
  3. G1, S and G2
  4. G2, S and G1

Sol:  G1, S and G2

Hint:  The correct sequence is G1 → S → G2.

Que-13: The phase of karyokinesis which is almost the reverse of prophase is :
  1. Interphase
  2. Metaphase
  3. Anaphase
  4. Telophase

Sol: Telophase

Hint:   In telophase, chromatids thin out in the form of chromatin fibres. In prophase, chromosomes become distinct.

Que-14: The lengthwise arrangement of DNA mainly consists of a phosphate group attached with :
  1. Hexose sugar
  2. Purines
  3. Pentose sugar
  4. Pyrimidines

Sol: Pentose sugar

Hint:   The lengthwise arrangement of DNA mainly consists of a phosphate group attached with five-carbon pentose (ribose) sugar.

Que-15: The number of histone proteins associated with the DNA in a nucleosome is:
  1. 6
  2. 8
  3. 4
  4. 1

Sol: 8

Hint:  A nucleosome has 8 histone proteins.

Que-16: The pyrimidine bases of DNA are:
  1. Adenine and Guanine
  2. Guanine and Cytosine
  3. Adenine and Thymine
  4. Thymine and Cytosine

Sol: Thymine and Cytosine

Hint:  Thymine and Cytosine are pyrimidine; and Adenine and Guanine are purine.

Que-17: The female gamete/egg cell of a human cell will have:
  1. 44 + XX chromosomes
  2. 44 + XY chromosomes
  3. 22 + X chromosomes
  4. 22 + Y chromosomes

Sol: 22 + X chromosomes

Hint:   Chromosome number is halved in gametes (sex cells) so the female gamete/egg cell of a human cell will have 22 + X chromosomes.

–: End of Structure of Chromosomes Cell Cycle and Cell Division MCQs ICSE Class 10  :–

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