Pollen from a Snapdragon Flower Lands on the Stigma of a Neighboring

question 143

Multiple Choice

Pollen from a snapdragon flower lands on the stigma of a neighboring snapdragon.The pollen tube germinates and extends through the maternal sporophyte tissue to the ovule, where it encounters the female gametophyte and releases two sperm, one that fuses with the egg and another that fuses with the polar nuclei.Which statement about this scenario is true?

• A) Pollination occurred when the egg and sperm nuclei fused, resulting in a diploid tissue that would eventually become nutritive tissue for the embryo.
• B) Fertilization occurred when the pollen grain landed on the stigma of the neighboring flower, before the pollen tube germinated and extended down to the female gametophyte.
• C) Pollination occurred when the pollen landed on the stigma, and a fertilization event occurred upon fusion of sperm and polar nuclei.
• D) Pollination occurred when the sperm and polar nuclei fused, whereas fertilization occurred upon fusion of the sperm and egg nuclei.
• E) The entire process, from pollen landing on the stigma through to the fusion of male and female gametes, is considered fertilization.

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Causal Worldview

A perspective or belief system that interprets events and situations in terms of cause and effect relationships.

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A perspective that appreciates the complexity of life without requiring direct cause-and-effect relationships to explain phenomena.

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