MCQ
Purines possess nitrogen at which position?
- A$1, 2, 4$ and $6$ position
- B$1, 3, 5$ and $7$ position
- ✓$1, 3, 7$ and $9$ position
- D$1, 2, 6$ and $8$ position

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$I -$ Tapetum nourishes the developing pollen grains.
$II-$ Hilum represents the junction between ovule and funicle
$III-$ In aquatic plants such as water hyacinth and water lily, pollination is by water:
$IV-$ The primary endosperm nucleus is tripoid.
$I.$ A soil inhabiting plant bacterium, Agrobacteriumtumefaciens, a pathogen of several dicot plants is able to transfer a piece of $DNA$ known as $T-DNA$
$II.$ The T-DNA causes tumours
$III.$ Tumour formation induced by $Ti-$ plasmid
Which of the statements given above are correct?
From this equation, $\mathrm{K}$ indicates: