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Summary REPRODUCTION IN VERTEBRATES
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Summary of chapter 3, Reproduction in vertebrates. Diagrams, structures and functions.
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Reproduction in Vertebrates
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21 Flashcards
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Flashcards
21 Flashcards
$1.70
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Some examples from this set of practice questions
1.
Explain external fertilization
Answer: - Egg is fertilized by sperm outside the body - No contact between organisms is necessary - Water is required to allow sperm to swim and to prevent drying out - Mass amounts of energy required to produce mass amounts of sperm as not all sperm may reach the egg(s)
2.
Give an example of an organism that uses external fertilization
Answer: Frogs, Starfish, Trout
3.
Explain Internal fertilization
Answer: - male deposits sperm inside of the female - allows for terrestrial life (no water required) - less energy used as less sperm needs to be produced - contact is necessary
4.
Give an example of an organism that uses internal fertilization
Answer: Birds, Mammals
5.
What are the three types of reproduction methods?
Answer: Ovipary, Vivipary, Ovovivipary
6.
Explain Ovipary
Answer: - eggs are laid - the eggs are fertilized either internally or externally - the embryo develops outside of the body - Eggs are preyed on by predators - Mostly invertebrates
7.
Explain Vivipary
Answer: - Develops in a uterus, internally - Nutrients are taken from the placenta - Born into the world active - Chances of offspring production are increased - Organisms are well developed when born - Mammals
8.
Explain Ovovivipary
Answer: - Develop in eggs internally - Nutrients are taken from egg yolk - Born active after internal hatching - Increased chances of offspring production - Well developed when born - Reptiles
9.
Name the 4 extra-embryonic membranes
Answer: 1. Chorion 2. Allantois 3. Amnion 4. Yolk Sac
10.
Name the 4 extra-embryonic membranes
Answer: 1. Chorion 2. Allantois 3. Amnion 4. Yolk Sac
Content preview
CHAPTER THREEREPRODUCTION IN VERTEBRATES
Fertilization
External
● Sperm fertilizes egg outside of body
● Contact is unnecessary
● Requires water to prevent gametes from drying out and to allow for male
sperm to swim
● Mass amounts of semen needs to be released as there is less chance of it
actually reaching the female eggs
● ie Frogs, starfish, trout
Internal
● Male deposits sperm into female body
● No water is required, thus allowing terrestrial life
● Less sperm produced and less energy needed
● ie Birds, mammals
REPRODUCTIVE METHODS
Classification of methods are dependent on: internal or external environment,
food source and whether the organism develops in an egg or not.
OVIPARY
● Eggs are laid
● Zygote develops outside of body
● Can be fertilised internally or externally
● Eggs are preyed on by predators
● ie Most invertebrates, a few vertebrates
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