Biology 1201A Lecture Notes - Lecture 9: Eumetazoa, Gastrovascular Cavity, Annelid

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2 Oct 2016

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Variations in characteristics: multicellular; heterotrophic; diploid generation; three layers embryonic development: tissue complexity: eumetazoa (functioning cells organized into tissues). It develops into the digestive tract of an animal). An amebocyte is a mobile cell in the body of invertebrates such as echinoderms, mollusks or sponges. Flukes are internal animal parasites/external parasites that suck tissue fluids/blood. Tapeworms are internal parasites that often live in digestive tract of vertebrates; appear segmented (only as 2nd for reproduction => not considered true segmented animal). Two kinds of life cycles: nymphs (small version of adult, change shape as grow proceeds). Notochord provides dorsal, flexible rod that functions as support; replaced by bone during development; in most vertebrates, it becomes nucleus pulposus of intervertebral disc; arrived from mesoderm. Dorsal hollow nerve cord forms basis of nervous system => brain and spinal cord. Pharyngeal gill slits provide channels across pharynx to outside body; slits become gills for o2 or filter-feeding; slit disappear during embryonic development in others.

Related Questions

1)Mushrooms and other fungi were once lumped in with the plant kingdom. Modern science has separated them into their own kingdom. Kingdom Fungi is distinguished from Kingdom Plantae by the fact that unlike plants fungi.

A)grow a haploid multicellular form from a haploid spore

B)have no cell walls

C)grow, rather than locomote, toward resources

D)are absorptive heterotrophs.

E)have no haploid multicellular stage

2)Members of the Kingdom Fungi are easily distinguished from the Kingdom Plantae because the Fungi

A)Do not have photosynthtic pigments.

B)Are mostly not adapted for living on land

C)Do not have cell walls

D)are primarily unicellular

E)All the above

3)Which of the following would NOT be part of a lichen?

A)chlorophytes

B) zygosporangia

C) basidiocarps

D)Soredia

E)Asci

4)The process of metamorphosis transforms a ______ into a ______________.

A)larva; sexually mature adult

B) blastopore;mouth

C)pseudocoelom; true coelom

D)zygote;blastula

E)blastula;gastrula

5)Which of the following tissues or structures could NOT be derived from ectoderm?

A) all but the digestive tract of a jellyfsh

B) all thin skin of a platyhelminth

C)the brain of a squid

D) the muscles of a nematode

E)your epidermis

6)Which of the following is NOT a characteristic of the phylum Platyhelminthes?

A) true mesodermal tissue

B) cephalization involving concentration of nerve ganglia

C) gas and water exchange is across the thin body wall

D) free living and parasitic form

E) segmentation

7)A triploblastic animal in which the fluid?filled body cavity is only partially lined (lined on one side) with mesodermal tissue is referred to as:

A)coelomate

B)deuterostome

C)acoelomate

D)protostome

E)pseudocoelomate

8)Which of the following groups are diploblastic animals?

A)corals

B) sponges

C) comb jellies

D) a and b

E) a and c

9)Animals that actively move in a unidirectional fashion through their environment would be expected to exhibit which of the following characteristics?

A) bilateral symmetry

B) sponges

C) comb jellies

D) a and b

E) a and c

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Biology 1201A Lecture Notes - Lecture 9: Eumetazoa, Gastrovascular Cavity, Annelid

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