The flowering plants are known for having well-defined male and female reproductive systems. The fertilization of the egg takes place when the pollen grains land on a compatible stigma. This pollen then germinates the pollen tube and absorbs moisture. The cell burrows itself towards the ovule through stigma and style. The pollen tube is guided towards the egg cell with the help of chemical cues sent by the synergic cells present close to the egg cell. When the pollen reaches the egg cell, fertilization takes place.

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Chapter 36, Problem 3TYK

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The flowering plants are known for having well-defined male and female reproductive systems. The fertilization of the egg takes place when the pollen grains land on a compatible stigma. This pollen then germinates the pollen tube and absorbs moisture. The cell burrows itself towards the ovule through stigma and style. The pollen tube is guided towards the egg cell with the help of chemical cues sent by the synergic cells present close to the egg cell. When the pollen reaches the egg cell, fertilization takes place.

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How does double fertilization occur in flowering plants?a. The two sperm in a pollen tube fertilize the two egg cells present ineach female gametophyte.b. One of the two sperm in a pollen tube fertilizes the single egg in afemale gametophyte, and the other fuses with the two nuclei presentin the central cell.c. Two sperm, one contributed by each of two different pollen tubes,fertilize the two egg cells in a single female gametophyte.d. Two sperm contributed by separate pollen tubes enter a singlefemale gametophyte; one of the sperm fertilizes the egg cell, and theother fertilizes the central cell.e. None of the above is correct.

Under which of the following conditions would pollen from an S2S5 plant successfully pollinate an S1S5 flower? a. Using pollen from a carpelate flower to fertilize a staminate flower would be successful. b. If the plants used gametophytic self-incompatibility, half of the pollen would be successful. c. If the plants used sporophytic self-incompatibility, half of the pollen would be successful. d. Pollen from an S2S5 plant can never pollinate an S1S5 flower.

The drooping, bell-like flower Aquilegia canadensis is adapted for cross-pollination. However, if the plant has not been pollinated previously, self-pollination can occur. However, if cross pollination occurs after self-pollination takes place, the pollen from cross pollination reaches the style before the pollen from self-pollination. Using course concepts and vocabulary 1) Provide a reasoning for this phenomenon. 2) Would this adaptation for reproduction be beneficial for the plant?