Chapter 23 Questions

Question 0

Contrast ectothermic and entothermic.

Answer 0

Ectothermic- control temp from outside.

Entothermic- control temp from inside.

Question 1

Contrast poikilothermic and homeothermic animals.

Answer 1

Poikilothermic- different temperature.

Homeothermic- constant temperature.

Question 2

How do poikilotherms modify effects of the environment on their temperature?

Answer 2

Poikilotherms modify temp by behavior.

Question 3

Describe three major body plans of animals.

Answer 3

1. Asymmetrical- develop fits to environment.
2. Radial Symmetry- no true “head end”
3. Bilateral Symmetry- in higher animals contain brain, have gut tube.

Question 4

Compare advantages and disadvantages of life in the ocean.

Answer 4

Advantages: no dehydration, no temperature extremes, ionic concentration like cells.

Disadvantages: limited light, hard to stay in place due to waves & current, hard to find mate if your sessile.

Question 5

Which phyla of animals have adapted to both land and water.

Answer 5

Mammals.

Question 6

Describe the specializations for parasitic life.

Answer 6

1. Find a host.
2. Resist being expelled.
3. Don’t kill host.
4. Attach to hold on.

Question 7

Describe three types of fish that occupy pelagic niches.

Answer 7

1. Jawless fish.
2. Jaws but no bones.
3. Bones and swim bladder.

Question 8

Which phylum occupies the greatest number of land habitats?

Answer 8

Arthropods

Question 9

What were the first vertebrates on land? What adaptations and limitations did these animals show?

Answer 9

Amphibians.

Can live on land, but need to go back to water to reproduce.