animal kingdom Flashcards
1
Q
what are chordates characterized by
A
presence of notochord
2
Q
cyclostomata
A
- ectoparasites
- bear 6-15 pairs of gill slits for respiration
- marine habitat but migrate to fresh wwater for spawning
- closed circulation
- lack jaws
- devoid of scales and paired fins
- vertebral column and cranium cartilaginous
- indirect development-metamorphosis
3
Q
chondrichthyes
A
- marine animals
- streamlined body, cartilaginous endoskeleton
- ventral mouth
- notochord persistent 4life
- placoid scales
- separate gill slits, absent operculum
- teeth-modified placoid scales-backward direction
- powerful jaws
- no air bladder-jus keep swimming
- 2 chambered heart
- torpedo-electric organs, trygon-poison sting
- poikilothermous
- dieocious
- viviparous and internal fertilisation
- eg: great white shark, sting ray, dog fish
4
Q
Osteichthyes
A
- marine and freshwater
- bony endoskeleton
- terminal mouth
- 4 pairs of gills-operculum
- cycloid/ctenoid scales
- air bladder
- oviparous, external fert
- dieocious
- direct development
- poikilothermous
- eg: betta fish, sea horse, rohu
5
Q
Amphibia
A
- aquatic as well as terrestrial
- 2 pairs of limbs, most of them
- skin is moist
- tympanum-ear
- alimentary canal, urinary, and reproductive tracts open into the common cloaca
- 3 chambered heart
- respiration-gills, lungs, and skin
- poikilothermous
- external fert, and oviparous
- indirect development-metamorphosis
- eg: toad, frog, salamander
6
Q
Reptilia
A
- mostly terrestrial
- body covered by dry and cornified skin
- epidermal scales/scutes
- tympanum
- 2 pairs of limbs, if present
- poikilotherms
- snakes and lizards shed their skin called skin cast
- dioceious
- internal fertilization, oviparous
- direct development
- turtle, tortoise, cobra, alligator, lizard
7
Q
Aves
A
- feathers. fly. except. ostriches.
- possess a beak
- forelimbs->modified into wings
- hind limbs-scales for walking, swimming, clasping tree branches
- oil gland at base of tail, nowhere else
- fully ossified endoskeleton; long bones hollow with air cavities
- digestive tract of birds-additional chambers-crop and gizzard
- homoiothermous
- internal fertilisation, oviparous; development is direct
- row, pigeon, parrot, peacock
8
Q
Mammalia
A
- PRESENCE OF MAMMARY GLANDS
- 2 pairs of limbs, walking, running, climbing, burrowing, swimming, or flying
- mammal skin-HAIR
- external ears-pinnae
- internal fert, viviparous; direct development
- eg: oviparous- kangaroo, platypus; viviparous- camel, rat, elephant, cat, me, lion, blue whale, common dolphin.
