MCQ
The largest petal overlaps the lateral ones in _________ aestivation.
- APapilionaceous.
- BValvate.
- CTwisted.
- DImbricate.
Explanation:
In pea and bean flowers, there are five petals, the largest overlaps the two lateral petals which in turn overlaps the two smallest anterior petals. This is called Vexillary or papilionaceous aestivation.
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| Column $-I$ | Column $-II$ |
| $(A)$ Pachytene | $(i)$ Pairing of homologous chromosomes |
| $(B)$ Metaphase$-I$ | $(ii)$ Terminalisation ofchiasmata |
| $(C)$ Diakinesis | $(iii)$ Crossing-over takes place |
| $(D)$ Zygotene | $(iv)$ Chromosomes align at equatorial plate |
$2.$ Aerobic bacteria find oxygen near the algae toutilize $O_2$