CBSE Questions for Class 11 Medical Biology Animal Kingdom Quiz 2 - MCQExams.com

• A dorsal hollow nerve cord, notochord, paired pharyngeal gill slits, and post-anal tail are the four fundamental features shown by all chordates. 
• Crocodiles, dogfish, whales, and penguins all belong to the phylum Chordata.
  
• The nervous system in chordates is hollow.
• Mammals, including aquatic ones like whales, don't lay an egg.
  
• Dogfish belong to cartilaginous fishes in which the endoskeleton is made of cartilage.
• They possess pharyngeal gill slits during the embryonic developmental stage, if not in the adult stage.

• Coelomates show the development of a circulatory system for the purpose of absorption of nutrients and its circulation throughout the body. 
• An important component of the circulatory system is a pigment containing fluid component called blood. 
• Blood is the liquid connective tissue that circulates in the entire body and serves various functions like carrying oxygen and carbon dioxide, hormones, nutrients, excretory substances etc.
• Hence, the correct answer is option C.

• Serpentology is the study of snakes.
• Herpetology is the study of amphibians and reptiles.
• Ichthyology deals with the study of fishes.
• Ornithology is the study of birds.

• Turtles are cold-blooded, which means they cannot regulate their body temperature.
• They live mainly in water, but they lay eggs with tough coverings (shells)  on land. 
• They have a three-chambered heart. 
• All of the mentioned characteristics are of reptiles.

Hence, option D is correct.

• Chameleons change colours to camouflage themselves and hide from predators.
  
• Puffer fish swallow air or water and inflate to protect themselves from predators.  
• Melanism in moths (development of dark colour) gives them a survival advantage, as the moth's colour matches the environment.
• In contrast, poison fangs in snakes are special teeth associated with venom glands and are used to attack prey or predators, not as a way to escape.
  

So, the correct answer is option ‘C’.

• Mammals are characterised by a well-developed diaphragm that separates the thoracic chamber from the abdominal cavity. The diaphragm plays an essential role during breathing in mammals.
• In crocodiles, it is called the Diaphragmaticus muscle and attaches to the hip joint, enveloping their ischium and pubis (pelvic girdle).
• Similar to the diaphragm the contraction of the Diaphragmaticus increases thoracic volume, creating negative air pressure, which aids inspiration. 

Hence, the correct answer is B.

• CORRECT OPTION - B
• EXPLANATION FOR CORRECT OPTION -

The Hemidactylus flaviviridis is a species of gecko. that are commonly found in Egypt, Saudi Arabia, India, etc. Garden lizards or Calotes Versicolor are widely found lizard species found in Indo-Malaya regions.

• EXPLANATION FOR INCORRECT OPTIONS –

(A) Spiny tail lizards or Uromastyx hardwickii are herbivores lizards that spend most of their time basking in the sun for maintaining their body temperature.

(C) Gila monster or Heloderma suspectum is a venomous lizard species that are commonly found in the Southwestern USA.

(D) Monitor lizards or Varanus are large lizards species found in Africa and Asia. 

• The scales of Manis (pangolins or scaly anteaters) closely resemble those of reptiles, but actually, they are mammals. They are the only mammals that are completely covered in scales and they use those scales to protect themselves from predators in the wild.
• Like platypuses and echidnas, they lay eggs and babies are nourished by their mothers' milk.
• Whereas Planorbis belong to the class of Mollusca, Hydrophis belong to the class of Reptilia and Psittacula belong to the class of Aves. 
• So, the correct answer is option A.