$S -$ Statement: In the pachytene substage,each group of chromosomes appears as a bivalent.
$R -$ Reason: During prophase in plant cells,the centriole units arranged at the two poles form spindle fibers.
$R -$ Reason: During prophase in plant cells,the centriole units arranged at the two poles form spindle fibers.
- A$S$ and $R$ are both true,and $R$ is the correct explanation of $S$.
- B$S$ and $R$ are both true,but $R$ is not the correct explanation of $S$.
- C$S$ is true and $R$ is false.
- D$S$ and $R$ are both false.
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Prophase $I$ of meiosis (reduction division) is divided into a number of stages. The correct chronological sequence is:
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View SolutionMatch the following columns $I$ and $II$:
Column $I$ Column $II$ $(A)$ Prophase-$I$ $(i)$ Chromosomes move towards poles with centromeres $(B)$ Metaphase-$I$ $(ii)$ Half the number of chromosomes are observed $(C)$ Anaphase-$I$ $(iii)$ Longest phase of Meiosis-$I$ $(D)$ Telophase-$I$ $(iv)$ Two nuclei are observed
| Column $I$ | Column $II$ |
|---|---|
| $(A)$ Prophase-$I$ | $(i)$ Chromosomes move towards poles with centromeres |
| $(B)$ Metaphase-$I$ | $(ii)$ Half the number of chromosomes are observed |
| $(C)$ Anaphase-$I$ | $(iii)$ Longest phase of Meiosis-$I$ |
| $(D)$ Telophase-$I$ | $(iv)$ Two nuclei are observed |
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