CBSE Questions for Class 11 Medical Biology Animal Kingdom Quiz 10 - MCQExams.com

• A tortoise/testudo shell is made of two parts the Plastron and Carapace. 
• The upper portion is called the Carapace and the bottom half is called the Plastron. 
• The carapace is the fusion of about 50 bones the ribs and vertebrae.  A bony bridge joins the carapace and the Plastron along the side of the turtle.
• Hence, The option 'D' is correct

A. Correct option- A
B. Explanation for the correct option.

Sphenodon is a New Zealand lizard. The anatomical characteristics of this organism differ widely from all other existing lizards. It is the only living representative of the order Rhynchocephalia, of which many Mesozoic fossil species are known.

• The loreal pit is a deep depression, or fossa, in the loreal area on either side of the head in pit vipers (crotaline snakes). 
• It is located behind the nostril and in front of the eye, but below the line that runs between the centers of each. 
• It is the external opening to an extremely sensitive infrared detecting organ. The loreal pit is bordered by lacunal scales. 
• The loreal pit also functions as part of a thermal regulating system, enabling pit vipers to maintain their body temperature. 
• Hence option A is correct.

• The whale shark(Rhincodon typus) is the largest living cartilaginous fish, of the order Orectolobiformes. It is the sole member of the genus Rhincodon and the only extant member of the family Rhincodontidae. They feed almost exclusively on plankton and small fishes, 
• It can grow to 18m long and weigh an average of 20 tons.
• The Egg of Rhincodon typus is about 30 cm size.
• So, the correct answer is '30cm'.

• Vestigial organs is the organs that occur in reduced form and are useless to the possessor but are homologous to the fully developed, functional organs of related animals. 
• The snakes have evolved from the lizard-like reptiles bearing two pairs of functional limbs, but due to change in their mode of life, have lost the limbs and girdles completely. 
• The pythons and boas still retain pelvic girdles and the hind limbs in a reduced condition. 
• So, the correct answer is option B.

• Ichthyosaurs are large extinct marine reptiles. Ichthyosaurs belong to the order known as Ichthyosauria or Ichthyopterygia.
• Pelycosaur is a land animal.
• Pterosaur is a flying reptile.
• Tyrannosaurus is a land animal.

• Answer is option B.
• Crocodiles have approximately 64 teeth in their mouth.
• but all theeth are unequal in shape and size this difference in tooth pattern make them unable to masticate there food.
• This teeth help them to bite with high intensity to kill there prey.
• They make huge pieces of flesh from the body of prey and engulf as it is.
• They have very strong digestive juices which could digest almost every part of body of prey.

1.  Digitigrade are those animals who walk on their digits and toes. For example, elephant.
   
2.  Unguligrade means they put their tips of digit on the ground and walk. example cow, deer, horse etc.
3. Plantigrade walks with the soles of their feet on the ground. For example, primates.
   

1. Bear is plantigrade that walks with the soles of their feet on the ground.
2. Elephants are digitigrade as they walks on their digits and toes.
3. Cow and deer are unguligrade means they put their tips of digit on the ground and walk. 

1. Deer have deciduous horns.
2. The giraffe does not possess true horns but called as ossicones made of ossified cartilage covered with skin.
3. Buffalo has a hollow cap which grows over a bone like core.
4. So the correct option is 'Buffalo'

• The whale shark(Rhincodon typus) is the largest living cartilaginous fish, of the order Orectolobiformes.
• It can grow to 40 feet long and weigh an average of 20 tons.
• These sharks are carnivorous, but they aren't likely to take a nibble out of an unwary surfer – they filter plankton through their enormous mouths while swimming at the surface
• Hence the largest fish is the whale shark.
• So, the correct answer is 'Whale shark'.

• Bradypus are mammals also known as three-toed sloths. 
• They are one of the only two mammalian species (sloths and manatees) that have a different number of cervical vertebrae as compared to the normal number of cervical vertebrae, 7. 
• Bradypus have either 8 or 9 cervical vertebrae.

Elephants are one of the largest mammals on earth and have a long evolutionary history. They also lack a pleural cavity, meaning that their lungs are directly attached to the diaphragm and chest walls. In elephants, air enters their body via three entrances, the mouth, the internal nares present on its forehead and the external nares present at the tip of their proboscis or trunk.

So, the correct answer is 'Tip of proboscis'.