The passage describes the sexual reproduction of a typical insect-pollinated plant.

Complete the passage by writing a suitable word in each blank space.

In the male parts of an insect-pollinated flower, pollen grains are produced within the 1. ______________. This process involves a type of cell division called 2. ______________, which halves the chromosome number to produce haploid pollen. When an insect visits the flower, pollen is deposited onto its body and then transferred to the sticky 3. ______________ of another flower. Upon landing, the pollen grain germinates and grows a tube down through the 4. ______________ to the ovary. The male gamete enters an 5. ______________ through a tiny pore called the micropyle. Here, the fusion of male and female nuclei, known as 6. ______________, takes place. After this, a seed is formed and the surrounding ovary wall develops into a 7. ______________.

Flowers have evolved different features depending on how they are pollinated.

State two differences between the pollen grains produced by insect-pollinated flowers and those produced by wind-pollinated flowers.

Explain why wind-pollinated flowers typically produce a much larger quantity of pollen than insect-pollinated flowers.