Class Chondrichthyes
Trending Questions
Q. Chondrichthyes is characterized by tooth-shaped –
- Ctenoid scale with ventral mouth
- Ctenoid scale with dorsal mouth
- Placoid scale with dorsal mouth
- Placoid scale with ventral mouth
Q.
Identify the following chondrichthyes fishes.
1.- Trygon , 2.- Scoliodon, 3- Pristis, 4- Carcharodon.
1.- Pristis, 2.- Carcharodon, 3- Trygon , 4- Scoliodon.
1.- Scoliodon, 2.- Pristis, 3- Carcharodon, 4- Trygon .
1.- Carcharodon, 2.- Trygon , 3- Scoliodon, 4- Pristis.
Q.
Cartilaginous fishes do not have
Operculum
Scales
Gill slits
Pelvic fins
Q.
Ventral mouth is seen in
Salamandra
Scoliodon
Labeo
Catla
Q.
The skeleton of chondrichthyes fishes is made up of
Q.
Teeth of cartilagenous fishes are modified
Ganoid scales
Cycloid scales
Placoid scales
Cosmoid scales
Q. Which of the following represents the correct combination without any exception?
Characteristics - Mammary gland; hair on body; pinnae; two pairs of limbs
Class - Mammalia
Characteristics - Body covered with feathers; skin moist and glandular; fore - limbs form wings; lungs with air sacs
Class - Aves
- Characteristics - Mouth ventral; gills without operculum; skin with placoid scales; notochord replaced by the vertebral column in adults.
Class - Chondrichthyes - Characteristics - Sucking and circular mouth; jaws absent, integument without scales; paired appendages
Class - Cyclostomata
Q. What will you look for to identify the sex of the following?
- Male shark - Claspers borne on pelvic fins
- Female Ascaris - Sharply curved posterior end
- Male frog - A copulatory pad on the first digit of the hind limb
- Female cockroach - Anal cerci
Q. A marine cartilaginous fish that can produce electric current is:
- Pristis
- Torpedo
- Trygon
- Scoliodon
Q. Which of the following characteristic features always holds true for the corresponding group of animals?
- Cartilaginous - Chondrichthyes
- Possess a mouth with an upper and a lower jaw - Chordata
- One incompletely divided ventricle - Reptilia
- Viviparous - Mammalia