A: Multicellular organisms begin their life f | vedclass

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Question

(B) Assertion $(A)$ is true because all multicellular organisms,including humans,start their life as a single-celled zygote.Reason $(R)$ is also true

Vedclass · Accepted Answer

$A$ and $R$ are both true,but $R$ is not the correct explanation of $A$.

Vedclass · Answer

(B) Assertion $(A)$ is true because all multicellular organisms,including humans,start their life as a single-celled zygote.Reason $(R)$ is also true because somatic cells are produced by mitosis,which maintains the same number of chromosomes as the parent cell.However,the fact that somatic cells have the same number of chromosomes is a result of mitotic division,not the reason why life begins as a single cell. Therefore,$R$ is not the correct explanation of $A$.

Column $I$	Column $II$
$A$. Chromosomes are moved to spindle equator	$I$. Pachytene
$B$. Centromere splits and chromatids move apart	$II$. Zygotene
$C$. Pairing between homologous chromosomes takes place	$III$. Anaphase
$D$. Crossing over between homologous chromosomes	$IV$. Metaphase

$A$: Multicellular organisms begin their life from a single cell.
$R$: All somatic cells of a multicellular organism have the same number of chromosomes.

Similar Questions

Which of the following options gives the correct sequence of events during mitosis?

$A$: During anaphase-$II$,chromatids of a chromosome separate.
$R$: Centromere of a mitotic chromosome divides during anaphase.

In the given figure,what are the stages $X$ and $Y$?

$S -$ Statement: Cells cannot maintain their efficient size through mitosis.
$R -$ Reason: Meiosis is an important process for evolution.

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$A$: Multicellular organisms begin their life from a single cell.$R$: All somatic cells of a multicellular organism have the same number of chromosomes.