Lecture 14-Animals

Question 1

Methods of asexual reproduction?

Answer 1

• Budding

- Parthenogenesis

Question 2

What are porifera? Characteristics?

Answer 2

• Porifera=Sponges
• Suspension feeders
• Hermaphrodites

Question 3

What is cleavage?

Answer 3

Mitotic cell divisions without cell growth, results in blastula.

Question 4

What is gastrulation?

Answer 4

Layers of embryonic germ tissue that form tissues and organs are produced.

Question 5

Characteristics of a diploblast?

Answer 5

• Two germ layers: Ectoderm (outer) and endoderm (inner)

Question 6

Characteristics of eumetazoa?

Answer 6

• Radial symmetry

- Single opening for nutrients

Question 7

What are the two forms of Cnidarians?

Answer 7

• Polyp (e.g. sea anemone)

- Medusa (e.g. Jellyfish)

Question 8

What is bilateral symmetry?

Answer 8

One axis of symmetry

Question 9

What is a triploblast?

Answer 9

An organism with all three germ layers: Ectoderm, Endoderm, Mesoderm

Question 10

Differences between protostome and deuterostome?

Answer 10

Protostome: Spiral, determinate, mesoderm cells split to form coelom

Deuterostome: Radial and indeterminate, Coelom forms as mesoderm grows and folds outward, blastopore becomes anus.

Question 11

Acoelomates, Pseudocoelomates, coelomates?

Answer 11

Acoelomates: Lack cavity
Pseudocoelomates: Real cavity, but formed between mesoderm and endoderm.
Coelomates: True coelom from mesoderm forming structures that suspend internal organs.