MCQ
Vascular bundle is closed, when
- ACambium present
- ✓Cambium absent
- CPericycle absent
- DNone of these
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$I.$ In the centre of each I-band is an elastic fibre ($Z-$line) which bisects it
$II.$ Thin filament are firmly attached to the $Z-$line
$III.\;M-$line is a fibrous membrane in the middle of $A-$band
$IV.$ A sarcomere comprises one full$-A $ band and two half $I-$bands