Class Osteichthyes MCQs
The following MCQ will give you more information about the topic ‘Class Chondrichthyes’.
1.) A skeleton of Chondrichthyes is composed of ……………………………………………………………………………………………..
a) Bone
b) Cartilage
c) Chitin
d) Cellulose
2.) Which of the following is incorrect regarding Chondrichthyes?
a) Skin contains minute placoid scales
b) Mouth is located dorsally
c) Gill slits are separate
d) All of the above
3.) The word ‘Chondricthyes’ refers to:
a) Bony fish
b) Cartilaginous fish
c) Jawless fish
d) Cold-blooded fish
4.) Match the following:
i) Scoliodon a) Sawfish
ii) Pristis b) Sting ray
iii) Trygon c) Dog fish
a) i)-a), ii)-b), iii)-c)
b) i)-b), ii)-c), iii)-a)
c) i)-c), ii)-b), iii)-a)
d) i)-c), ii)-a), iii)-b)
5.) Sharks have teeth-like scales and those known as:
a) Integuments
b) Scaloid
c) Lencets
d) Denticles
6.) All of the chondrichthyes are viviparous.
a) True
b) False
7.) Why do sharks cannot produce any noise?
a) Due to the presence of water.
b) Because they don’t have vocal cords.
c) Due to temperature.
d) Because they don’t have ears.
8.) In dogfish teeth are directed in which direction?
a) Front
b) Backwards
c) Left
d) Right upward
9.) Which of the following third eyelid protects the eye during feeding?
a) Cellular membrane
b) Nuclear membrane
c) Nictitating membrane
d) None of these
10.) Why does Pristis have to swim constantly?
a) Due to the presence of an air bladder.
b) Due to the absence of an air bladder.
c) Due to the absence of fins
d) Due to their heavy weight
11.) Identify the part of the shark that detects Prey?
a) Denticles
b) Islets of Langerhans
c) Ampullae and of Lorenzini
d) Fins
12.) Torpedo possesses which type of specific organ?
a) Electric organ
b) Water jet
c) Poison needles
d) Poison sting
13.) Which of the following is a natural enemy of sharks?
a) Killer whale
b) Other sharks
c) Humans
d) All of them
14.) In male Chondrichthyes pelvic fins bear ………………………………………………………………………………..
a) Nails
b) Stings
c) Claspers
d) Scales
15.) Which of the following is incorrect regarding Chondrichthyes members?
a) These animals are predaceous in nature
b) They show bioluminescence property
c) They have strong jaws
d) None of the above
16.) Trygon possesses which of the following?
a) Poison sting
b) Electric organ
c) Body cavity
d) None
17.) Carcharodon is also called:
a) Sawfish
b) Stingray
c) Great white shark
d) Dogfish
Answers:
1.)
Solution: b) Cartilage
Fish of Chondrichthyes don’t have bones. But, a skeleton of Chondrichthyes is composed of cartilage.
2.)
Solution: b) Mouth is located dorsally
The mouth is present ventrally not dorsally so option b is incorrect.
3.)
Solution: b) Cartilaginous fish
Chondrichthian is also known as Chondrichthyes. Sharks, rays, and skates are cartilaginous fish that are included in the Chondrichthyes. So, Chondrichthyes refers to Cartilaginous fish.
4.)
Solution: d) i)-c), ii)-a), iii)-b)
5.)
Solution: d) Denticles
The mouth of a shark is present ventrally and they have teeth-like scales. These are known as Denticles.
6.)
Solution: b) False
Many of them are viviparous but not all are viviparous. There are some members that are oviparous, like heterodontiformes and chimaeriformes.
7.)
Solution: b) Because they don’t have vocal cords.
The vocal cords have the ability to produce sound. But, they are absent in the sharks. Because of this, Shark cannot produce sound.
8.)
Solution: b) Backwards
Teeth are modified placoid scales which are directed in the backward direction.
9.)
Solution: c) Nictitating membrane
The nictitating membrane is also called the third eye which is present in some sharks. During feeding, this membrane covers the eye completely for protection.
10.)
Solution: b) Due to the absence of an air bladder.
Due to the absence of an air bladder, they cannot maintain buoyancy and will sink to the bottom if they won’t swim continuously.
11.)
Solution: c) Ampullae and of Lorenzini
The Ampullae of Lorenzini are present on the snout of the shark. This detects electrical currents that can be weak or strong. Prey mainly produces this kind of electrical current.
12.)
Solution: a) Electric organ
The electric organ produces electric discharge which helps in navigation, communication, and defence against predators, etc.
13.)
Solution: d) All of them
The natural enemies of sharks are dangerous sharks. They include humans, killer whales, and other sharks as well.
14.)
Solution: c) Claspers
In males, Chondrichthyes claspers perform the function of sperm transfer during copulation.
15.)
Solution: b) They show bioluminescence property
They don’t have the property of bioluminescence, which is present in Ctenophora phylum members hence option b is incorrect.
16.)
Solution: a) Poison sting
The poison is present in its tail which is used to capture its prey and also as a defence mechanism against predators.
17.)
Solution: c) Great white shark
Great white sharks have grey color in their upper body which blends them with the rocky coastal sea floor and they get their white name from their white-colored underbellies.
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