BISC 120Lg Lecture Notes - Lecture 13: Planaria, Lophotrochozoa, Gastrovascular Cavity

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cerisegiraffe538

13 Jul 2015

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Bisc 120: general biology: organismal and evolutionary biology- lecture 13: Has true tissues and is triploblastic (this is new!) Has a trochophore larval stage with cilia or has a lophophore (feeding structure) All the above are similar but they are a diverse group of taxa. Study the tables at the end of the chapters to help cram! Lophotrochozoa is a clade identified by molecular data, have the widest range of animal body plants. Include species that are free-living or parasitic. They are triploblastic so they have a mesoderm. Planaria and other flatworms lack organs specialized for gas exchange and circulation. Because they are flat, they have a high sa to volume ratio so wastes are removed by diffusion. Has a gastrovascular cavity (in through mouth and out through the same opening as the anus) One side has a concentration of neural tissues. Paired eyespots that detect changes in light. Planaria can learn to modify their response to stimuli.

Related Questions

QUESTION 1

The âCambrian Explosionâ describes the relatively sudden appearance of __________ in the fossil record in the Cambrian.

		Metazoans
		Eukaryotes
		Algae
		Cephalopods
		Chocolate

0.5 points

QUESTION 2

Poriferans lack:

		Extracellular matrix
		Organs
		Choanocytes
		Nuclei

0.5 points

QUESTION 3

Which of the following has no terrestrial species?

		Brachiopoda
		Nematoda
		Mollusca
		Arthropoda

0.5 points

QUESTION 4

The metazoan phylum with the greatest diversity (i.e., number of species) today is:

		Arthropoda.
		Annelida.
		Cnidaria.
		Mollusca.

0.5 points

QUESTION 5

Segmentation is a feature of:

		Cnidarians
		Platyhelminthes
		Nematodes
		Annelids

0.5 points

QUESTION 6

A coelom is:

		Fun for the whole family.
		A fluid-filled body cavity forming within the mesoderm.
		A stinging cell found in cnidarians.
		A characteristic of flatworms.
		A fluid-filled body cavity between the mesoderm and endoderm.

0.5 points

QUESTION 7

How old is the earliest fossil evidence of life?

		3.8 Ma
		3.8 Ga
		1.8 Ga
		543 Ma

0.5 points

QUESTION 8

Which of the following is found only in bilaterians?

		Mesoderm
		Choanocytes
		Radial symmetry
		Gastrulation
		Nougat

0.5 points

QUESTION 9

Which of the following is not an explanation put forward for the Cambrian Explosion?

		Oxygen increase
		Revolution in substrate use
		Predation
		Global warming

0.5 points

QUESTION 10

Cnidarians are distinct from other animals in having:

		A can-do attitude
		Nematocysts
		Chitin
		Collagen
		Bilateral symmetry

0.5 points

QUESTION 11

Which of the following is a group within Platyhelminthes?

		Insecta
		Velveeta
		Bivalvia
		Cestoda
		Hydrozoa

0.5 points

QUESTION 12

Of Fungi, Metazoa, and Plantae, which two are thought to be more closely related to each other than they are to the third?

		Metazoa and Plantae
		Fungi and Plantae
		Fungi and Metazoa

0.5 points

QUESTION 13

The Cryogenian is a period of the Proterozoic characterized by:

		Low self esteem
		Earliest fossils of life
		Cooling and glaciation
		Sudden appearance of fossils with hard parts
		Increase in oxygen

0.5 points

QUESTION 14

Which of the following is thought not to have been abundant in the environment of the early Earth when life originated?

		Oxygen
		Nitrogen
		Methane
		Water

0.5 points

QUESTION 15

Of Archaea, Bacteria, and Eukarya, which two are thought to be more closely related to each other than they are to the third?

		Bacteria and Eukarya
		Archaea and Bacteria
		Archaea and Eukarya

0.5 points

QUESTION 16

The increase in oxygen that occurred around 2.3 Ga is referred to as:

		The Snowball Earth
		The Permian Extinction
		The Cambrian Explosion
		The Great Oxidation Event
		Friday

0.5 points

QUESTION 17

A lophophore is:

		A feeding structure found in brachiopods and bryozoans.
		A reproductive structure found in annelids and molluscs.
		A photoautotroph.
		Available at Targetâ¢.
		Absent in all lophotrochozoans.

0.5 points

QUESTION 18

One of the main divisions of protostomes is:

		Electronica
		Cnidaria
		Eukarya
		Lophotrochozoa
		Deuterostomia

0.5 points

QUESTION 19

If, as some studies have suggested, Ctenophora is the sister-taxon to other metazoans, this would imply that:

		Poriferans are not animals.
		Cnidarians are not monophyletic.
		We are all hosed.
		Nervous systems evolved more than once, or were lost by Porifera.
		Ctenophorans are cnidarians.

0.5 points

QUESTION 20

The chambered shells of fossil cephalopods contribute to:

		Feeding.
		The Red Cross.
		Respiration.
		Control of buoyancy.
		Propulsion.

BISC 120Lg Lecture Notes - Lecture 13: Planaria, Lophotrochozoa, Gastrovascular Cavity

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