$(1)$ Give scientific reason: Meiosis is called reductional division.
$(2)$ Give scientific reason: Mitosis is necessary for growth,development,and repair of the cell.
$(2)$ Give scientific reason: Mitosis is necessary for growth,development,and repair of the cell.
(N/A) $(1)$ During meiosis,the chromosome number is reduced to half in the daughter cells compared to the parent cell. Therefore,it is known as reductional division. The cells transition from a diploid $(2n)$ state to a haploid $(n)$ state.
$(2)$ The life of a living organism begins from a single-celled zygote. Cell division adds new cells to the body,which is essential for growth and development. Mitosis produces genetically identical daughter cells,which replace damaged or dead cells,thereby facilitating tissue repair and maintenance.
$(2)$ The life of a living organism begins from a single-celled zygote. Cell division adds new cells to the body,which is essential for growth and development. Mitosis produces genetically identical daughter cells,which replace damaged or dead cells,thereby facilitating tissue repair and maintenance.
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Similar Questions
Select the correct option for the following matches:
List-$I$ List-$II$ $(1)$ Metaphase-$I$ $(a)$ Number of chromosomes becomes half of the parent cell $(2)$ Anaphase-$I$ $(b)$ Each chromosome splits at the centromere to form chromatids $(3)$ Anaphase-$II$ $(c)$ Homologous chromosomes form pairs at the equatorial plate $(4)$ Telophase-$II$ $(d)$ Homologous chromosomes move towards opposite poles
| List-$I$ | List-$II$ |
| $(1)$ Metaphase-$I$ | $(a)$ Number of chromosomes becomes half of the parent cell |
| $(2)$ Anaphase-$I$ | $(b)$ Each chromosome splits at the centromere to form chromatids |
| $(3)$ Anaphase-$II$ | $(c)$ Homologous chromosomes form pairs at the equatorial plate |
| $(4)$ Telophase-$II$ | $(d)$ Homologous chromosomes move towards opposite poles |
Medium
View SolutionArrange the following events of mitosis in correct order and select the correct option from options given below :
$a.$ Movements of chromosome towards opposite pole
$b.$ Movement of centriole towards opposite poles
$c.$ Chromosome align on equator
$d.$ Reformation of nuclear membrane and nucleolus
$a.$ Movements of chromosome towards opposite pole
$b.$ Movement of centriole towards opposite poles
$c.$ Chromosome align on equator
$d.$ Reformation of nuclear membrane and nucleolus
Medium
View SolutionMatch List-$I$ with List-$II$ :
List-$I$ (Phase of cell cycle) List-$II$ (Activity) $A$. $G_1$ phase $I$. Actual cell division occurs $B$. $S$ phase $II$. Cell is metabolically active and continuously grows but does not replicate its $DNA$ $C$. $G_2$ phase $III$. Synthesis of $DNA$ occurs and the amount of $DNA$ per cell doubles $D$. $M$ phase $IV$. Proteins are synthesized while cell growth continues
Choose the correct answer from the options given below :
| List-$I$ (Phase of cell cycle) | List-$II$ (Activity) |
| $A$. $G_1$ phase | $I$. Actual cell division occurs |
| $B$. $S$ phase | $II$. Cell is metabolically active and continuously grows but does not replicate its $DNA$ |
| $C$. $G_2$ phase | $III$. Synthesis of $DNA$ occurs and the amount of $DNA$ per cell doubles |
| $D$. $M$ phase | $IV$. Proteins are synthesized while cell growth continues |
Choose the correct answer from the options given below :
MediumNEET 2026
View SolutionSelect the correct option by matching Column $I$ with Column $II$.
Column $I$ Column $II$ $A$. Synapsis aligns homologous chromosomes $(i)$ Anaphase $II$ $B$. Synthesis of $RNA$ and protein $(ii)$ Zygotene $C$. Action of enzyme recombinase $(iii)$ $G_2$ phase $D$. Centromeres do not separate but chromatids move towards opposite poles $(iv)$ Anaphase $I$ $(v)$ Pachytene
| Column $I$ | Column $II$ |
| $A$. Synapsis aligns homologous chromosomes | $(i)$ Anaphase $II$ |
| $B$. Synthesis of $RNA$ and protein | $(ii)$ Zygotene |
| $C$. Action of enzyme recombinase | $(iii)$ $G_2$ phase |
| $D$. Centromeres do not separate but chromatids move towards opposite poles | $(iv)$ Anaphase $I$ |
| $(v)$ Pachytene |
MediumNEET 2015
View Solution$A$: Multicellular organisms begin their life from a single cell.
$R$: All somatic cells of a multicellular organism have the same number of chromosomes.
$R$: All somatic cells of a multicellular organism have the same number of chromosomes.
Medium
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