Biology 28 & 29

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36 Terms

1
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What is asymmetry in animals?

No particular pattern to body shape.

2
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What type of symmetry is characterized by body organized circularly?

Radial symmetry.

3
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What type of symmetry do humans exhibit?

Bilateral symmetry.

4
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What does the blastopore become in protostomes?

The mouth.

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What are two key characteristics of deuterostomes?

Blastopore becomes anus; dorsal nerve cord.

6
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What animals belong to the phylum Porifera?

Sponges.

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What are the unique characteristics of cnidarians?

Radial symmetry, tissues, stinging tentacles.

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What are the three main parts of mollusca?

Mantle, visceral mass, and foot.

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What type of animals are found in the phylum Annelida?

Segmented worms, such as earthworms and leeches.

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What is a unique characteristic of platyhelminthes?

Flat body and no body cavity.

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What is a characteristic feature of nematodes?

Non-segmented body and some are parasites.

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What defines the phylum Arthropoda?

Exoskeleton, jointed appendages, segmented body.

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What symmetry do adult echinoderms exhibit?

Radial symmetry.

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Which vertebrates are considered ectothermic?

Amphibians, reptiles, and fish.

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What is the definition of endothermic?

An internal way to control body temperature.

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Which vertebrates are endothermic?

Birds and mammals.

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What is a monotreme?

A mammal that lays eggs, such as the duck-billed platypus.

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What is a unique feature of marsupials?

They have pouches for immature young.

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What are the main characteristics of all chordates?

Deuterostomes, postnatal tail, notochord, dorsal tubular nerve cord, pharyngeal pouches.

20
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Radial Symmetry

Body organized circularly; similar to a wheel

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Bilateral Symmetry

Definite Right and left halves

22
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What are the differences between protstomes and deuterostomes

Protostomes: Blastopore becomes mouth; ventral nerve cord; spinal cleavage.

Deuterostomes: Blastopore becomes anus; dorsal nerve cord; radial cleavage

23
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Porifera Phyllum

No symmetry, no tissue, filter food particles through water

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What animals are in the Cnidaria phylum

Jellyfish, corals, sea anemones

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Cnidaria phylum

Tissue, stinging tentacles, polyp has mouth pointed upward, Medusa has mouth pointed downward

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What animals are in the mollusca phylum

Snails, clams, oysters, squid, octopus

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What animals are in the annelida phylum

Segmented worms; earthworms, leeches

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Annelida Phylum

Body segments repeated along length of body

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What animals are in the platyhelminthes phylum

flatworms; planaria, tapeworms

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Platyhelminthes Phylum

Flat body; no body cavity

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What animals are in the nematoda phylum

Roundworms

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Nematoda Phylum

Non-segmented body; some are parasites

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What animals are in the Arthropoda phylum

Crustaceans; crabs, shrimp, lobster, crayfish

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Arthropoda Phylum

Exoskeleton; jointed appendages, segmented body

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What animals are in the echinodermata phylum

Starfish

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Echinodermata Phylum

Deuterostomes, water vascular system, radial symmetry in adult, bilateral symmetry in larva