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

Question # 1

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 # 2

How is mitosis related to the process of regeneration.

Ans 1: Some animals can regenerate parts of the body For this purpose, they form new cells by carrying out mitosis in the cells of remaning parts.

Question # 3

What is the role of spindle fibres in mitosis.

Ans 1: During mitosis, spindle fibres ensure the accurate separation of sister chromatids of chromosoemes attache dwith spindle fibres in telephase.

Question # 4

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 # 5

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 # 6

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 # 7

Enlist the events that occur during the G1 Phase of interphase.

Ans 1: During G1 phase of interphase followign events occur.
i. Cell makes proteins and organelles and so grow in size.
ii. Cell also makes enzymes required in S-phase for replication of DNA.

Question # 8

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.

Question # 9

Difference between Cytokinesis and Karyokinesis.

Ans 1: Cytokineis:
The process of cytoplasmic division to called cytokinesis
Ans 2: Karyokinesis:
The process of nuclear division is called karyokinesis

Question # 10

What is the mian purpose of the S Phase in the cell cycle.

Ans 1: During this phase the DNA of each chromosome is replicated . It results in the duplication of chromosoems chromosomes consists of two sister The totla number of chromosomes in celll remains the same.

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Matric Part 1/9th Class Biology Chapter 4 Short Questions Test With Answer for Chapter 4 (Cells and Tissues)

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Online Short Questions For Chapter 4 "9th Class Biology Urdu Medium Chapter 4 Preparation "

Biology (New Book) - 9th Class Biology Urdu Medium Chapter 4 Preparation

What is the function of the centrosome during cell division.

How is mitosis related to the process of regeneration.

What is the role of spindle fibres in mitosis.

Centromeres and kinetochores

What are teh key events of anaphase in mitosis.

Difference between Mitosis and Meiosis

Enlist the events that occur during the G1 Phase of interphase.

How does crossing over contribute to genetic variation in meiosis?

Difference between Cytokinesis and Karyokinesis.

What is the mian purpose of the S Phase in the cell cycle.

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

What is the function of the centrosome during cell division.

How is mitosis related to the process of regeneration.

What is the role of spindle fibres in mitosis.

Centromeres and kinetochores

What are teh key events of anaphase in mitosis.

Difference between Mitosis and Meiosis

Enlist the events that occur during the G1 Phase of interphase.

How does crossing over contribute to genetic variation in meiosis?

Difference between Cytokinesis and Karyokinesis.

What is the mian purpose of the S Phase in the cell cycle.

9th Biology Urdu Medium Chapter 4 Preperation

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