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chordates Flashcards

1
Q

Phylum chordata derived it’s name from

A

presence of notochord in it’s species

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2
Q

purpose of notochord is to

A

support and stiffen the body

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3
Q

the CNS of chordates is

A

Dorsal and hollow

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4
Q

all chordates have ___ in embryonic stage

A

paired gill opening

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5
Q

chordates are divided into

A

lower chordates
higher chordates

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6
Q

In higher chordates notochord replaced by

A

vertebral column

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7
Q

higher chordates are also called __

A

craniates

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8
Q

lower craniates are called __

A

acraniates / protochordata

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9
Q

protochordata / acraniates are divided into __ sub phylums

A
  1. Urochordata
  2. Cephalochordata
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10
Q

Urochordates are also called __

A

Tunicates

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11
Q

ex of urochordata

A

molgula

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12
Q

example of cephalochord?

A

amphioxus

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13
Q

Notochord and nerve cord run through entire length of body in ?

A

cephalochord

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14
Q

Vertebrates are divided into two classes

A
  1. Class pisces
  2. Class tetrapod
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15
Q

Amniotes are absent in

A

cyclostomata
chondrichthyes } Class Pisces
osteichthyes
amphibian } Class Amphibian

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16
Q

Amniotes are present in

A

reptiles
aves
mammals

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17
Q

Cyclostomata is also called

A

Agnatha

18
Q

Most primitive living vertebrates without jaw are included in class

A

cyclostomata / agnatha

19
Q

pair of gills in cyclostomate

A

6-14 pair of gills

20
Q

example of cyclostomata?

A

Lampreys
Hagfishes

21
Q

hagfishes sexuality?

A

hermaphrodite

22
Q

skeleton of cyclostomata is

A

cartilaginous skeleton is present

23
Q

Heart has __ auricle in cyclostomata

A

one auricle

24
Q

Chondrichthyes includes __

A

Sharks and Rays

25
Q

Chondrichthyes have __ skeleton

A

Cartilage

26
Q

body of Chondrichthyes is __

A

Fusiform

27
Q

Chondrichthyes have _ scales on body

A

placoid scales

28
Q

Chondrichthyes have __ stomach

A

J-shaped

28
Q

___ pair of gills are present in Chondrichthyes

A

5-7 pairs

29
Q

Sharks reach the length of

A

30-50 feet

30
Q

Shark liver oil is used as source of Vitamin

A

A and D

31
Q

_have no swim bladder

A

Chondrichthyes

32
Q

Osteichthyes are called __ fishes

A

bony fishes

33
Q

__ chambered heart is present in Osteichthyes

A

2

34
Q

Brain of Osteichthyes have __ pair of cranial nerves

A

10

35
Q

group of ancient fishes is known as

A

Dipnoi

36
Q

dipnoi developed __ for breathing in terrestial mode

A

lungs

37
Q

the first vertebrates to come to land __

A

amphibian

38
Q

_ are borderline between aquatic and terrestrial animals

A

Amphibian

39
Q

Amphibians are resembling __ and __

A

fish and reptiles

40
Q

heart of amphibian is _ chambered

A

3

41
Q

amphibian are ___ blooded

A

cold (poikilothermic)

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