The Coelem

Question 1

What is a coelem

Answer 1

A fluid filled cavity btw the 2 layers of the mesoderm in some triploblastic metazoans

Question 2

Absence of body cavity is know as

Answer 2

Acoelomate

Question 3

Vertebrates constitute ______% of the animal kingdom

Answer 3

3%

Question 4

A body cavity that is not a product of gastriculation is

Answer 4

Psuedocoel

Question 5

In cnidarians ______ is found btw the endoderm and ectoderm

Answer 5

Mesoglea

Question 6

Mesenchyme/parenchyma is found btw the ectoderm and endoderm in

Answer 6

Platyhelminthes

Question 7

The first cavity to appear during embryonic development is

Answer 7

Blastocoel

Question 8

Blastocoel is also called

Answer 8

Primary body cavity

Question 9

The solid parenchyma forms in the blastocoel of

Answer 9

Acoelomates

Question 10

The cavity left by failure of parenchyma to completely fill the space btw the mesoderm of the body wall and gut wall is called

Answer 10

Psuedocoel

Question 11

Psuedocoel is a derivative of

Answer 11

Blastocoel

Question 12

No muscle layer is present gut wall of

Answer 12

Psuedocoelomates

Question 13

Psuedocoel is found in which major phylum

Answer 13

Nematoda

Question 14

The fluid in coelemic cavity is in direct contact with the body or gut wall

Answer 14

False

Question 15

The coelom is completely surrounded by

Answer 15

Mesodermal tissue

Question 16

Peritoneal epithelium (peritonium) separates

Answer 16

The coelomic fluid from the gut and body wall

Question 17

The outer part of the mesoderm becomes intimately associated with

Answer 17

The body walls

Question 18

The inner mesoderm becomes associated with

Answer 18

The gut wall

Question 19

The body wall is lined with parietal/somatic mesoderm to become

Answer 19

The parietal peritonium

Question 20

The coelom is lined with visceral/splanchic mesoderm which forms

Answer 20

The visceral peritonium

Question 21

What are mesenteries

Answer 21

Cellular lining provided by the mesoderm which binds internal organs within the coelom

Question 22

What is a schizocoel

Answer 22

Type of coelom formed by splitting of the mesoderm

Question 23

In adult molluscs and arthropods, coelom is reduced and replaced by

Answer 23

Haemocoel

Question 24

The haemocoel is filled with

Answer 24

Blood

Question 25

Coelom formed by out pocketing or out pouching of the mesoderm is called

Answer 25

Enterocoel

Question 26

Enterocoels occur in

Answer 26

Echinoderms, hemichordates and chordates

Question 27

An important structural adaptation in coelomates is

Answer 27

Metamerism

Question 28

What is metamerism

Answer 28

Division of body into series of similar segments developed to thesame degree and arranged in linear series from anterior to posterior end of the animal

Question 29

Basically metamaric invertebrates are

Answer 29

Annelids and arthropods

Question 30

Which Phylum demonstrates the least modified form of metamerism

Answer 30

Annelids

Question 31

What is cephalization

Answer 31

Refers to the development of all features associated with the head

Question 32

Based on comparative embryology, coelomates are divided into

Answer 32

Protostomes and dueterostomes

Question 33

Protostome characterises

Answer 33

Molluscs Annelids Arthropods

Question 34

When Upper tier of cells is twisted 45⁰ out of line with the lower tier is known as

Answer 34

Spiral cleavage of egg after fertilization

Question 35

Blastophore develops into mouth in

Answer 35

Protostomes

Question 36

The cells of __________ embryo develop independently of one another and are unable to substitute for each other when one is removed is known as

Answer 36

Determinate (mosaic) embryo of protostomes

Question 37

_______ is embryonic development that characterises echinoderms and chordates

Answer 37

Dueterostomes

Question 38

When Upper tier of cells sits directly on top of the lower tier is known as _______ cleavage

Answer 38

Radial cleavage

Question 39

Blastophore of dueterostomes develop into

Answer 39

Anus

Question 40

When removing a cell from an embryo does not affect its development is called

Answer 40

Indeterminate (regulative) embryo

Question 41

Ectoderm gives rise to

Answer 41

Epidermis ie outer layer of the body walls

Question 42

Gastrodermis which lines the gut cavity results from

Answer 42

Endoderm

Question 43

_________ gives rise to the organs of circulation, excretion and reproduction including muscles, connective tissues and blood cells

Answer 43

Mesoderm

Question 44

Coelem often acts as ________ skeleton

Answer 44

Hydrostatic skeleton