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Which one of the following statements is false in respect of viability of mammalian sperm?

1. Sperm is viable for only up to 24 hours.
2. Survival of sperm depends on the pH of the medium and is more active in alkaline medium.
3. Viability of sperm is determined by its motility.
4. Sperms must be concentrated in a thick suspension.

Correct answer: Sperm is viable for only up to 24 hours.

Solution

The false statement is the one claiming sperm are viable for only up to 24 hours, because mammalian sperm can survive longer than that under suitable conditions. Their viability is influenced by factors like pH and is commonly assessed by motility.

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