MCQ
In dicot stem, vascular bundles are
- ANumerous scattered
- ✓Arranged in a ring
- CWithout cambium
- DSurrounded by bundle sheath
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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
$I.$ Cytokinins especially help in delaying senescence.
$II.$ Auxins are involved in regulating apical dominance.
$III.$ Ethylene is especially useful in enhancing seed germination.
Gibberellins are responsible for immature falling of leaves