internal and external fertilisation

Question 1

fertilisation

Answer 1

• joining the nucleus of an egg and a sperm

- many vertebrate ways of achieving this

Question 2

external fertilisation

Answer 2

• water
• aquatic vertebrates
• wasteful (huge number of eggs)
• no ensurity

Question 3

how can external fertilisation maximis production?

Answer 3

• huge number of eggs and sperm

- courtship rituals (eg. fish)

Question 4

internal fertilisation

Answer 4

• terrestrial vertebrates
• fertilise eggs inside of the body
• most birds and reptiles : use cloaca (single opening located lower abdomen)
• a majority to all males have a penis

Question 5

how does internal fertilisation maximise reproduction?

Answer 5

• more certain

- energy saved in production of less gametes