Lecture 3

Question 1

Radial Symmetry

Answer 1

Can be divided equally by any longitudinal plane passing through the central axis

Question 2

Bilateral symmetry

Answer 2

Can be divided along a vertical plane at the middle to create two identical halves

Question 3

Except Adult Echinoderms?

Question 4

Cnidarians and Ctenophores?

Answer 4

Often circular or tubular in shape with a mouth at one end

Question 5

Cephalization

Answer 5

Specialized head with feeding and sensory organs

Question 6

Segmentaion

Answer 6

Most animals with bilateral symmetry

Question 7

Coelom

Answer 7

What separates the gut from the body wall in most bilaterally symmetrical animals

Question 8

What is formed in the mesoderm o the embryo

Answer 8

A fluid-filled cavity, ie the coelom

Question 9

Acoelomate

Answer 9

No body cavity, flat worms, N.B. Diploblasts are all acoelomates

Question 10

Pseudocoelomate

Answer 10

Pseudocoelum (fluid-filled or organ filled space between endoderm an mesoderm, roundworms

Question 11

A common evolutionary history helps us to learn ____

Answer 11

Common principles

Question 12

Physiological phenotype is a product of ____

Answer 12

The genotype and the environment

Question 13

Animals occupy very diverse types of environments and help us to understand ____

Answer 13

Environmental adaptaions

Question 14

What challenges must animals overcome to be able to survive and reproduce? (4)

Answer 14

Extract nutrients & oxygen/energy form the environment
Eliminate toxic metabolic wastes from the body
Sense the environmental changes and respond favorably
maintain near constant internal body conditions

Question 15

Unifying concepts

Answer 15

Diversity within animals, yet with some common principles applying to all

Question 16

Physiological processes must (2)

Answer 16

Obey the laws of physics and chemistry
Usually tightly regulated (homeostasis)