Animal Reproduction and Development

Question 1

What is the difference between oviparous and viviparous reproduction?

Answer 1

Oviparous animals lay eggs; viviparous animals give birth to live young.

Question 2

How do marsupials differ from placental mammals?

Answer 2

Marsupials give birth to underdeveloped young that continue to develop in a pouch.

Question 3

What is external fertilization, and which animals use it?

Answer 3

Fertilization occurs outside the body, common in fish and amphibians.

Question 4

What are the three stages of mammalian development

Answer 4

Zygote, embryo, and fetus.

Question 5

How do monotremes reproduce?

Answer 5

They lay eggs but produce milk to feed their young.

Question 6

What is the role of the placenta in mammals?

Answer 6

To provide oxygen and nutrients to the developing fetus and remove waste products.

Question 7

How does the reproductive system of birds differ from that of mammals?

Answer 7

Birds have a cloaca for reproductive and excretory functions, and fertilization is internal but egg development occurs externally.

Question 8

What is metamorphosis, and which animals undergo it?

Answer 8

A developmental process where an animal undergoes significant changes in form, e.g., insects (caterpillar to butterfly) or amphibians (tadpole to frog).