MCQ
In $C_3$ plants, first stable product of $CO_2$ fixation is
- ✓$3-PGA$
- BStarch
- C$OAA$
- DPyruvate

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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 |
$R$ : Sapwood contains actively conducting vessels and occupies central part of stem.