CBSE Questions for Class 11 Medical Biology Animal Kingdom Quiz 4 - MCQExams.com

• Fishes are classified into two groups: Chondrichthyes (cartilaginous endoskeleton) and Osteichthyes (bony endoskeleton). 
• Shark belongs to Chondrichthyes. They have a cartilaginous endoskeleton and paired nares. They are the jawed vertebrates with scales. 
• While Tuna and Rohu belong to Osteichthyes. 

• Nephridia are functionally similar to kidneys in vertebrates.
• Nephridia are found in pairs in invertebrate animals such as $$Amphioxus$$.
• Its function is to expel water from the body cavity to exterior.
• Thus, correct answer is option C.

• The devilfish is a species of eagle ray, belonging to the phylum Chordata.
• Crayfish, also known as crawfish, crawdads, freshwater lobsters or mudbugs, are freshwater crustaceans and belong to the phylum Arthropoda.
• Cuttlefish are marine animals that belong to phylum Mollusca.
• The flying fish can make powerful, self-propelled leaps out of the water into the air, where their long, wing-like fins enable gliding flight. It belongs to class Pisces.

• Animals of phylum Chordata are characterised by the presence of the notochord, a dorsal hollow nerve cord, post-anal tail and pharyngeal gill slits.
• In adult vertebrates, the notochord is replaced by the vertebral column.
• The diaphragm is a thin skeletal muscle found only in mammals.
• Amnion is present only in mammals, birds, and reptiles. It is the innermost membrane that encloses the embryo. 
• Thus, the correct answer is option D. 

• Torpedo is the scientific name of electric ray.
• Didelphis is the genus of opossum
• Labeo is the genus of carps.
• Scoliodon is the genus of a shark commonly known as 'dogfish'. 
• Thus, the correct answer is option C.

‘The body is distinguished into three unequal regions, proboscis, collar, and trunk’: is a characteristic of Phylum Hemichordata. Hemichordates are wormlike marine invertebrates closely related to both chordates and echinoderms.

Whereas,

• Option A: Herdmania is a marine animal and has an oblong baglike body.
• Option B: Amphioxus are small fish-like marine animals body is divisible into four regions. 
• Option C: Petromyzon (jawless fish) is a snake-like marine organism.

Solution:

Correct answer is option A.
Explanation for correct option:

• Poikilothermic animals are those which have the inability to regulate the core body temperature (as by sweating to cool off or by putting on clothes to warm up). These include fish, reptiles.
• Amniota is a group of limbed vertebrates that includes all living reptiles (class Reptilia), birds (class Aves), mammals (class Mammalia), and their extinct relatives. Amniotes are truly terrestrial. 

The platypus also called Ornithorhynchus or duck-billed platypus is an egg-laying mammal but feeds its young with milk and is endemic to eastern Australia.

Thus, the correct answer is option C.