MCQ
The strongest evidence that $DNA$ is genetic material comes from
- AThat chromosomes are made up of $DNA$
- ✓Transformation of bacterial cells
- CThat $DNA$ is not present in the cytoplasm
- DThat $DNA$ is present in the nucleus
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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.
| Chromosomes | Position of centromere |
| $(A)$ Metacentric | $(1)$ At the tip |
| $(B)$ Submetacentric | $(2)$ Almost near the tip |
| $(C)$ Acrocentric | $(3)$ At the middle |
| $(D)$ Telocentric | $(4)$ Slightly away from the middle |