MCQ
Chiasmata formation takes place during:
- AProphase I
- BMetaphase I
- CAnaphase II
- DTelophase I
Explanation:
The chiasmata formation occurs during diplotene phase of prophase I of meiosis I.
Chiasmata are the points of attachment between non-sister chromatids of two homologous chromosomes.
It leads to an exchange of segments and creates variation.
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$I.$ Stretch receptors on the wall of urinary bladder send signal to the $CNS$
$II.$ The bladder fills with urine and becomes distended
$III.$ Micturition
$IV.$ $CNS$ passes on motor messenger to initiate the contraction smooth muscles of bladder and simultaneous relaxation of urethral sphincter
The correct order of steps for urination is
| Column-$I$ | Column-$II$ |
| $A$. $RER$ | $I$. Intracellular and extracellular digestion |
| $B$. Cell wall | $II$. Provide structural support to the cell |
| $C$. Flagella | $III$. Protein synthesis and secretion |
| $D$. Lysosomes | $IV$ Responsible for cell movement |