Dissection of the Style Shows That Numerous Pollen Tubes Have

question 4

Multiple Choice

Dissection of the style shows that numerous pollen tubes have grown down from the surface of the stigma and terminate well before reaching the ovules. Their failure to reach the ovules is most likely due to:

• A)the presence of inferior alleles controlling pollen growth in the population.
• B)exhaustion of growth factors for pollen tube growth due to inadequate pollen provisioning.
• C)exhaustion of growth factors for pollen tube growth provided by the style.
• D)the presence of a self-incompatibility system controlled by S-gene alleles.

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Definitions:

Absolute Efficiency

A state where resources are allocated in the most effective way possible, achieving maximum output with given inputs.

Natural Endowment

Resources found in nature that have economic value or utility, such as minerals, forests, and water.

Merchandise Trade Deficit

A situation where a country's imports of goods exceed its exports of goods, leading to a negative balance of trade.

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