Fertilisation in Animals: External vs Internal · Zoology

The probability of fertilisation success in external fertilisation is increased by:

  1. Low number of gametes
  2. Internal gestation
  3. Simultaneous release of gametes
  4. Thick egg shells
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Correct answer: Simultaneous release of gametes

Simultaneous release of gametes ensures that sperm and eggs are present at the same time and place. This increases chances of fertilisation.

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