chondrichthyes Flashcards
1
Q
how are their gills slits
A
they are not covered by operculum
2
Q
do they show notochord
A
yes persistent notochord throughout their life
3
Q
how many of the statements below are incorrect, correct them
1. they can easily adapt to the temperature around
2.their skin is soft
3.teeth is backwards and modified from the same thing as their scale
4.they have no airbladder so to avoid sinking they keep swimming
5. males have pelvic claspers ie also found in female
A
- they are poikilotherms [coldblooded] so no
2.they have a hard skin that is made of placoid scales - correct
4.correct - only in males
4
Q
trygon: poison sting: torpedo: ______
A
electric organ
5
Q
their body,fertilisation
A
they are marine animals with streamlined body, they have cartilaginous endoskeleton, internal fertilisation and are viviparous
6
Q
their examples?
A
scoliodon [dogfish], pristis [saw fish], carchardon [great white shark], trygon [sting ray]
