Question

In order for an ovule (egg cell) in a flower to be fertilized and form a viable seed, pollination must occur. In this process, a sperm cell is delivered to the ovule when the pollen grain lands on the stigma and grows a tube, which enters the ovary and discharges the sperm cell to form a diploid zygote when it fuses with the egg cell. Although it only takes one pollen grain to successfully deliver sperm to the egg, numerous pollen grains are generally transferred to the stigma during insect pollination of flowering plants. Which phenotypic traits of pollen would you predict to be selected upon to promote survival and fitness within an insect-pollinated flowering plant?
A) high pollen tube growth rate and ability to detect chemicals from cells surrounding the egg
B) ability to produce the most cells during mitotic growth of the pollen tube
C) elaborate and striking UV "nectary guides" on the petals to guide an insect to the stigma
D) larger pollen in order to carry the tube that is necessary for delivery of the sperm cells

Answer 1

Phenotypic traits of pollen would you predict to be selected upon to promote survival and fitness within an insect-pollinated flowering plant is

(B) ability to produce the most cells during mitotic growth of the pollen tube.

• In seed flora, the female reproductive organ consists of the ovule. it's far in which female reproductive cells are produced and housed. After fertilization, those cells sooner or later become a seed, which then ripens to form a complete-grown adult plant. Ovules are housed in ovaries at the base of a vase-like shape referred to as a carpel, which has an opening on the pinnacle referred to as a stigma and a neck known as a style.

• Following fertilization, the ovule starts offevolved to swell and its wall begins to thicken so that you can transform right into a seed, while the ovary begins to make bigger round it and change into the fruit. take into account that even as some plants, just like the kiwifruit, have many ovules that grow to be numerous seeds in the fruit, different flora, just like the avocado, handiest have one ovule in their ovary.
• The place of the ovules is any other manner that plants differ from one another in regard to them. Ovules are particularly discovered on the scales of lady cones in gymnosperms, consisting of conifers, whereas they're discovered in the ovary inside the carpel in angiosperms, or flowering vegetation.

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