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animalia > Aschelminthes > Flashcards

Aschelminthes Flashcards

1
Q

name

A

`nematodes - the round worms

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2
Q

nematode means

A

pointed ends

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3
Q
A
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4
Q

general information

A

bilateral symmetry
triploblastic
pseudocoelom`
unsegmented

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5
Q

body cavity is

A

pseudocoelom /false coelom

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5
Q

body cavity is

A

pseudocoelom /false coelom

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6
Q

body cavity is derived from

A

blastocoel - the fluid filled cavity of blastula

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7
Q

does mesoderm give rise to body cavity

A

no it doesnt, it give rise to body cavity in coelomates

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8
Q

fluid is present or not

A

it is present

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9
Q

where

A

in between body wall and alimentary canal

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10
Q

Digestive system

A

parasitic round worms- simplifeid digestive system
two openings

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11
Q

which have simplified digestive system

A

parasitic platyhelminthes and parasitic aschelmenthis

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12
Q

type of digestive system

A
  1. tube within a tube-like structure
  2. anus and a mouth
  3. anterior mouth and posterior anus
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13
Q

type of digestive system

A
  1. tube within a tube-like structure
  2. anus and a mouth
  3. anterior mouth and posterior anus
    4.
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13
Q

structure of organism

A

tapering at both ends

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14
Q

type of digestive system

A
  1. tube within a tube-like structure
  2. anus and a mouth
  3. anterior mouth and posterior anus
    4.
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14
Q

do they contain nephridie, metanephridia , protonephridia or none

A

protonephridia

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15
Q

type of digestive system

A
  1. tube within a tube-like structure
  2. anus and a mouth
  3. anterior mouth and posterior anus
    4.
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15
Q

describe excretory system

A

two longitudinal canals that join at the anterior end to form a single canal tha opens into exterior through an extrernal opening present on the ventral side of the organism.
they have protonephridia

16
Q

respiratory system

A

lack- occurs through body surface

17
Q

nervous system

A
  1. nerve ring
  2. papillae
  3. special sensory organs
18
Q

what is nerve ring

A

nerve ring of nerve tissue and ganglia is present around the pharynx and give rise to dorsal, lateral, and ventral nerve cords that are connected with transverse cords

19
Q

are there transverse cords

A

yes- nbf

20
Q

are there specialized sense organs in the anterior region of the organism

A

no, they are present in platyhelmenthis though

21
Q

specialized sensory organs in the anterior region are presen in which phyla

A
22
Q

what are pappillae

A

they are sense organs present at the lips at the anterior end.

23
Q

what are papillae in humans

A

present in tonge

24
Q

reproduction

A
  1. diecious, or separate sexes
  2. ovaries and testes
25
Q

female

A

ovary

26
Q

males

A

testes

27
Q

is there a larval stage

A

yes

28
Q

is the larval trochophore larvae

A

no

29
Q

where is trochophore larvae preset then

A
30
Q

muscular system

A
  1. noncontinuous
  2. four bands of muscles
31
Q

desrcibe the muscles

A

four bands of muscles
1. 2 dorsolateral
2. 2 ventrolateral
no circular muscles

32
Q

are there circular muscles

A

no

33
Q

does bending occurs

A

yes

34
Q

how

A

dorsolateral bending only due to absence of circular muscles

35
Q

are there circular muscles present

A

no

36
Q

size range

A
  1. moslty are 5cm
  2. microscopic parasites
  3. to one meter long
37
Q

skeleton

A

hydrostatic skeleton

38
Q

how is this hydrostatic skeleton obtained

A

presenve of vacuolated protien rich fluid filled cells.

39
Q

circulatory system

A

absent

40
Q

locomotion

A

undulating waves of contraction and relaxation of muscless

41
Q

locomotion

A

undulating waves of contraction and relaxation of muscless

animalia (8 decks)

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