Characteristics of Human Male Gametes

Steps:

• Identify male gametes as sperm cells produced in testes.
• Note sperm size: small and streamlined for mobility.
• Recall production: millions of sperm generated daily via spermatogenesis.
• Confirm motility: sperm possess flagella to swim toward the egg.

Why D is correct:

• Male gametes (sperm) are defined in reproductive biology as small, produced in millions per ejaculation, and motile to enable fertilization.

Why the others are wrong:

• A: Describes female gametes (ova), which are large and produced as one per cycle, not motile.
• B: Sperm are small, not large, and can move despite being produced in millions.
• C: Sperm number in millions, not normally one, though they are small and can swim.

Final answer: D