A pollen tube delivers two sperm to the ovule in order to accomplish double
.

Question

A pollen tube delivers two sperm to the ovule in order to accomplish double 
.

BlackTom AI · Accepted Answer

The question states: 'A pollen tube delivers two sperm to the ovule in order to accomplish double 
fertilization.' This is a fill-in-the-blank format where we must supply the missing term.

Option 1 (空白1): This option corresponds to the missing word that completes the sentence. The standard term that describes the process described is fertilization, more specifically double fertilization in angiosperms.

Reasoning for why 'fertilization' is correct: In flowering plants, the pollen tube carries two sperm cells to the ovule. One sperm fuses with the egg to form a diploid zygote, while the other sperm fuses with the two polar nuclei (in the central cell) to form the triploid endosperm. This combination of events is known as double fertilization, a defining feature of angiosperms. Therefore, the blank should be filled with 'fertilization' to reflect the process.

Why other potential options (if any) would be incorrect: Since only the term 'fertilization' completes the concept of double fertilization in this context, any alternative would fail to name the specific process occurring when the two sperm reach the ovule. If there were competing terms (e.g., 'pollination' or 'gametogenesis'), they describe earlier steps in reproduction or separate processes and do not capture the event of sperm–egg and sperm–central cell fusion that defines double fertilization. In this item, the provided or implied correct term is 'fertilization'.

A pollen tube delivers two sperm to the ovule in order to accomplish double .

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