Top Banner

Click here to load reader

Why are nonvertebrates important?

Feb 23, 2016

ReportDownload

Documents

gerd

Why are nonvertebrates important? . Why are nonvertebrates important? . Chordates. Tells us what is the connection between invertebrates and vertebrates is. Nonvertebrates. Tunicates -1,250 species. Lancelets -23 species . Station #1: Characteristics Common to All Chordates. a. . b. . - PowerPoint PPT Presentation

Nonvertebrates

Why are nonvertebrates important?

Why are nonvertebrates important?

ChordatesTells us what is the connection between invertebrates and vertebrates isNonvertebrates Tunicates

-1,250 speciesLancelets

-23 species

3What are some characteristic features of nonvertebrates? What function do these characteristic features serve? What adaptations do nonvertebrates have compared to animals before them?They have notochords

They can have gills Provides the animal with structured development

They can increase breathing efficiency -They have notochords

a. b. Station #1: Characteristics Common to All ChordatesExamine image a. It is a representation of all chordate organisms at an early stage of embryonic development. Draw a similar image for yourself in your packet (use pen or pencilnot colored pencils yet). Only draw the following inside of this developing organism:

1) Notochord 2) Hollow Nerve Cord 3) Pharyngeal pouches 4) Anus and tail. Examine image b. From roman numeral I through III you will notice the development of the fish, salamander (amphibian), tortoise (reptile), chick (bird), hog (mammal), calf (mammal), rabbit (mammal), and human (mammal). In your packet, write down what similarities you see between the development of the animals.

Write the following in your packet in your own words!! Answer any questions provided along the way in your packet.

All animals have the characteristics you drew earlier at least during embryonic development: 1) Notochord 2) Hollow Nerve Cord 3) Pharyngeal pouches 4) Anus and tail. The notochord is not always present in the adult form of animals. Trace your notochord with the color purple. What does the notochord form in adults? Answer this in your packet in a complete sentence (so, you can reference the information later). The hallow nerve chord is not always present in the adult, trace it with the color red. If it is present in the adult form of the animal, the nerve chord develops into the brain and spinal chord for the animal. Predict what the pharyngeal pouches develop into. 5

Station #2: Amniotic Egg

a. True, many mammals do not lay eggs. In fact, only two animals, platypus and spiny anteaters, lay eggs. So, why are mammals considered to have amniotic eggs? To answer this question, examine image a, determine which ONE of the 6 components pictured are not present during all mammal fetus development. Write the answer in your packet (not just the answer itself, but the question too).

You may now realize that the amniotic egg is composed of many of the same characteristics true of all other mammal fetus development. To help you remember the purpose of the amniotic egg in animal development, define each word (only the 5 relevant to all animals). However, do not use text to define each word. Write each word then draw a picture next to it to represent its purpose. For example, for amnion, I would draw a pillowyou can use this example. 7

b. a. Station #3: Regulation of body temperature Examine image a. Answer the following questions in your packet. Writing the questions in your packet will help you study later. You can abbreviate the questions to make your life easier, i.e. @40 environment temp, lizard temp=

1. When it is 40 degrees Celsius outside, the temperature of the lizard is how many degrees?

2. When it is 10 degrees Celsius outside, the temperature of the lizard is how many degrees?

3. When it is 40 degrees Celsius outside, the temperature of the pigeon is how many degrees?

4. When it is 10 degrees Celsius outside, the temperature of the pigeon is how many degrees?

Based on your answers to questions 1-4, compare the way pigeons and lizards control their body temperature.

Examine image b. Study the graph, what chordate animal group (s) is represented in this graph?

If ecto means outside, if endo means inside, and if thermic means heat. Define what an ectothermic animal and endothermic animal are (in your packet). 8Station #4: Closed Circulatory Systemsa.

b. Some animals use diffusion to allow them to take in oxygen and get rid of carbon dioxide. Other animals use an open circulatory system. In an open circulatory system blood bathes organs. This sort of circulatory system is not very efficient. Examine the examples of closed circulatory systems in image a and b. Both of the images depict a 2, 3, and 4 chambered circulatory system. There are simply different details provided on each of the images. Why do you suppose closed circulatory systems are more efficient then open circulatory systems (answer the question in your packet?

In your packet, draw a sketch of each chamber in your packet. Label just the name of the chamber and the atria and ventricles. The atrium receives deoxygenated blood from the body. The ventricles provide oxygenated blood (that comes from the lungs) to the body.

In you packet, describe why each animal might have each type of closed circulatory system. 9