Order Sequence of events W pollen lands on stigma → tube grows down the style → male nucleus reaches the ovule → nuclei fuse X tube grows down the style → p...
Question 1 Report
| Order | Sequence of events |
|---|---|
| W | pollen lands on stigma → tube grows down the style → male nucleus reaches the ovule → nuclei fuse |
| X | tube grows down the style → pollen lands on stigma → nuclei fuse → male nucleus reaches the ovule |
| Y | nuclei fuse → pollen lands on stigma → tube grows down the style → male nucleus reaches the ovule |
| Z | male nucleus reaches the ovule → nuclei fuse → pollen lands on stigma → tube grows down the style |
The table shows four possible orders of events. Which order (W to Z) correctly describes fertilisation in a flower?
Answer Details
Fertilisation follows a fixed sequence: pollen lands on the stigma, the pollen tube grows down through the style, the male nucleus is carried to the ovule, and finally the two nuclei fuse. The order in the table that lists these steps in this sequence is the correct one. The other orders put fusion or the tube growth before the pollen even lands, which is impossible. Keep pollination (pollen reaching the stigma) first and fusion of nuclei last.
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