MCQ
Pteridophytes are characterized by
- APresence of vascular system
- BAbsence of flowers
- CAbsence of fruits
- ✓All the above
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| Column $I$ | Column $II$ |
| $a.$ Auxin | $(i)$ Root hair formation |
| $b.$ Cytokinin | $(ii)$ Seed development |
| $c.$ Ethylene | $(iii)$ Xylem differentiation |
| $d.$ $ABA$ | $(iv)$ Nutrient mobilisation |
| 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 between homologous chromosomes |
$IV$ | Metaphase |
$\begin{array}{|l|l|} \hline Column\,\,-I & Column\,\,-II \\ \hline A.\,\,Natural\,\,auxin & 1.\,\,IAA \\ \hline B.\,\,Synthetic\,\,auxin & 2.\,\,NAA \\ \hline & 3.\,\,IBA \\ \hline & 4.\,\,2-4-D \\ \hline \end{array}$
$A - B$
$X - Y - Z$