MCQs on Structure of Chromosomes Cell Cycle and Division Class 10 Concise Selina Solutions Ch-2. In this article you will get the solutions of Various MCQs on Structure of Chromosome Cell Cycle and Cell Division . Visit official website CISCE for detail information about ICSE Board Class-10 Biology.

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

Board	ICSE
Subject	Biology
Class	10
Book	Selina Concise
Chapter-2	Structure of Chromosomes Cell Cycle and Cell Division
Topics	MCQs on Structure of Chromosomes Cell Cycle and Division

MCQs on Structure of Chromosomes Cell Cycle and Division

Class 10 Concise Biology ICSE Selina Solutions Ch-2

Que-1:  The chromatin material is formed of

1. DNA only
2. DNA and Histones
3. Histones only
4. Nucleotides

Ans:  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

Ans:  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

Ans: 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

Ans: 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

Ans: Prophase, metaphase, anaphase, telophase

Que-6:  The new cells are to be produced for all except:

1. Growth
2. Movement
3. Repair
4. Replacement

Ans: 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

Ans: 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

Ans: 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

Ans: 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

Ans:  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

Ans:  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

Ans:  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

Ans: 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

Ans: 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

Ans: 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

Ans:  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.

Que-18: The figure given alongside was shown to students of class 10 in the laboratory under a compound microscope. They were told to observe the slide, identify the stage of mitotic cell division and mention the number of chromosomes which would be found in the daughter cells. Which of the following will be the correct response?

1. Anaphase, 8 chromosomes
2. Metaphase, 8 chromosomes
3. Anaphase, 4 chromosomes
4. Telophase, 4 chromosomes

Ans:  Anaphase, 4 chromosomes
Hint:   During mitosis the chromosome number remains the same, and in anaphase the sister chromatids move towards opposite ends. During this phase, in animal cell, the furrow formation starts in the cell membrane at the middle by which the cytoplasm will divide after mitosis.

Que-19: 

Assertion. Both centromere and centrosome are parts of chromosome.

Reason. The centromere is the region where spindle fibres attach, while the centrosome helps in the formation of spindle fibres.

1. Both A and R are True.
2. Both A and R are False.
3. A is True and R is False.
4. A is False and R is True.

Ans: A is False and R is True.
Explain Why :- The centromere is the region on a chromosome where spindle fibres attach, while the centrosome is the organelle that produces these spindle fibres. Both the centromere and the centrosome are separate structures and are not parts of the chromosome.

Que-20: 

Assertion. The basic structural unit of DNA is nucleotide.

Reason. DNA is composed of repeating nucleosome which are made up of three components – pentose sugar, phosphate group and nitrogenous bases.

1. Both A and R are True.
2. Both A and R are False.
3. A is True and R is False.
4. A is False and R is True.

Ans: A is True and R is False.
Explain Why :- DNA is organized into repeating units called nucleosomes, which consist of DNA wrapped around histone proteins. Each nucleotide in DNA is made up of a pentose sugar, a phosphate group, and a nitrogenous base.

Que-21: 

Assertion. Centrosome is the point of attachment of two chromatids of a chromosome.

Reason. Centrosome initiates and regulates the process of cell division as it helps in the formation of spindle fibres.

1. Both A and R are True.
2. Both A and R are False.
3. A is True and R is False.
4. A is False and R is True.

Ans:  A is False and R is True.
Explain Why :- The centromere is the region where the two chromatids of a chromosome are joined. Centrosomes, which contain centrioles, are cell structures that play a key role in initiating and regulating cell division.

Que-22: 

Assertion. Meiosis is the kind of cell-division which occurs during gamete formation in the gonads.

Reason. During meiosis, chromosome number remains the same in parent cell and daughter cells which is very significant to maintain the identity of the organism.

1. Both A and R are True.
2. Both A and R are False.
3. A is True and R is False.
4. A is False and R is True.

Ans:  A is True and R is False.
Explain Why :- During meiosis, the chromosome number is reduced to half. In fertilisation, two haploid gametes fuse to restore the normal diploid chromosome number.

–: End of MCQs on Structure of Chromosomes Cell Cycle and Division Class 10 Concise Selina Solutions  :–

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