Biology 9th Class Urdu Medium Chapter 4(Cells and Tissues) Online Short questions with Answers Preparation

Question # 1

Difference between Chromatin and Chromosome

Ans 1: Chromatin
In the beginning of prophase. The chromosome are not visibel as they are in the form of fine thread like structures called chromatin
Ans 2: Chromosome:
During prophase the chromatin begins to shorten, thicken and coil by a process called condensation. It results in the appearence of chromosmes.

Question # 2

What is the differecne between prophase of mitosis and prophase -I of meiosis-I.

Ans 1: Prophase of mitosis:
Pairing of homolgous chromosomes does not take palce
Crossing over is absent
Ans 2: Prophase -I of mesiosis-i:
During Prophase-I paring of homolgousl chromosomes takes palce
Crossing over leads to genetic recombination.

Question # 3

What is M-Phase

Ans 1: In this phase cell is divided into two daughter cells. This phase is called M-Phase

Question # 4

What are sister chromatides, and when do they separate in meiosis.

Ans 1: Sister chromatide are identical copies of a single chromosomess. These sister chromatides are separated during anaphase -II of mciosis.

Question # 5

Centromeres and kinetochores

Ans 1: Centromeres:
The centromere is a constriction in chromosome
Ans 2: Kinetchores:
Kinetochores are proteins that act as attachement site for spindle fibres

Question # 6

What is the function of the centrosome during cell division.

Ans 1: During cell division the centrosome of cell duplicates into two these wo centrosomes migrate to the opposite side of the nucleus and make netwrok of microtubules called spindle fibres These spidle fibre ensure accurate separation of chromosomes.

Question # 7

Difference between Diploid cells and Haploid cells

Ans 1: Diploidmeans cells have full number of chromosomes
Somatic cells are diploid (2n) cells.
These are responsible for growht and maintenance of the organismsm
These are producred by meiosis.
Diploid number of chromosomes in man in 46
Ans 2: Haploid Cells:
Haploid means cells having half number of chromosomes
Germ line cells are haploid (n) cells.
These are involved in sexual reproduction.
Theser are proeuced by mitosis
The haploid number of chromosomes in man is 23

Question # 8

What are teh key events of anaphase in mitosis.

Ans 1: i. Constrictio of spindle fibers towards their respective poles.
ii. Equal separation of sister chromatids of chromosoems.

Question # 9

Difference between Mitosis and Meiosis

Ans 1: Mitosis:
It takes place in somatic cells
It consists of one division
Crossing over does not take place drung prophase
Chromatides divides at anaphase
Individiual duplicated chromosome align at the metaphase plate during metaphase
Daughter chromosoem mvoe to opposite poles during anaphase
Two dipliud daughter cells are formed.
The number of chromosomes remains censtant.
Ans 2: Meiosis:
It takes place in germ line cells of sex organs.
It consists of two divisions
Crossing over takes place duirng prophase-I
Chromatids does not divide at anaphase-I
Paired homolgous chromosomes align at metaphase plate during metaphase-I
Homolgous chromosomes with two sister chromatids, separate and move to opposite poles during anaphase-I
Four haploid daughter cells are formed.
The Number of chrosomes becomes half in meiosis.
Meiotic product cannot undergo further divisions.

Question # 10

How does crossing over contribute to genetic variation in meiosis?

Ans 1: During crossing over, exchange of segements of non -sister chromatide os homolgous chromosomes take place. This process leads to recombination of genetic material andincrease genetic diversity.

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Difference between Chromatin and Chromosome

What is the differecne between prophase of mitosis and prophase -I of meiosis-I.

What is M-Phase

What are sister chromatides, and when do they separate in meiosis.

Centromeres and kinetochores

What is the function of the centrosome during cell division.

Difference between Diploid cells and Haploid cells

What are teh key events of anaphase in mitosis.

Difference between Mitosis and Meiosis

How does crossing over contribute to genetic variation in meiosis?

Prepare Complete Set Wise Questions For Chapter 4 "9th Class Biology Urdu Medium Chapter 4 Preparation "

Set 1

9th Class Biology Urdu Medium Chapter 4 Preparation - Set 1

Difference between Chromatin and Chromosome

What is the differecne between prophase of mitosis and prophase -I of meiosis-I.

What is M-Phase

What are sister chromatides, and when do they separate in meiosis.

Centromeres and kinetochores

What is the function of the centrosome during cell division.

Difference between Diploid cells and Haploid cells

What are teh key events of anaphase in mitosis.

Difference between Mitosis and Meiosis

How does crossing over contribute to genetic variation in meiosis?

9th Biology Urdu Medium Chapter 4 Preperation

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