Characteristics of human male gametes (sperm)

Steps:

• Recall that human gametes are sex cells: sperm from males and eggs from females.
• Identify male gametes as sperm, produced in testes in large numbers for fertilization.
• Note sperm features: small size, high quantity (millions per ejaculation), and flagella for swimming motility.
• Compare to options to match all correct traits: small, millions, can swim.

Why D is correct:

• Sperm are small haploid cells produced in millions daily and possess a tail for active swimming to reach the egg, as defined in reproductive biology.

Why the others are wrong:

• A: Sperm are small and motile, not large; eggs are large but only one per cycle.
• B: Sperm are small, not large; while millions are produced, they can move independently.
• C: Sperm number millions, not one; eggs are one per ovulation but non-motile.

Final answer: D