FFA Veterinary Science CDE Practice Test

What aspect of sperm is evaluated during microscopic semen evaluation that indicates deformed or defective sperm?

1. Morphology

2. Dilution

3. Storage

4. Stimulation

The correct answer is: Morphology

Morphology is the aspect of sperm evaluated during microscopic semen analysis that indicates the presence of deformed or defective sperm. In this context, morphology refers to the size, shape, and structure of individual sperm cells. Proper morphology is crucial for fertility, as abnormal sperm may have trouble reaching the egg or fertilizing it. Assessing morphology involves examining a sample under a microscope to identify any abnormalities such as an irregular head shape, abnormal tail structure, or size inconsistencies. These defects can significantly impact the sperm's ability to function effectively during reproduction. The other options pertain to different factors that do not directly evaluate the physical structure of the sperm. Dilution refers to the process of adding a fluid to the semen to prepare it for evaluation or storage, but it does not assess sperm quality. Storage involves maintaining the viability of the semen over time, which is essential for future use but does not relate to the immediate evaluation of sperm defects. Stimulation is related to the physiological processes that encourage sperm production or mobility, but it again does not address the examination of sperm morphology itself.