Question:

All mammals without any exception are characterised by

Updated On: Jul 5, 2022
  • viviparity and biconcave red blood cells
  • extraabdominal testes and a four chambered heart
  • heterodont teeth and 12 pairs of cranial nerves
  • a muscular diaphragm and milk producing glands
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The Correct Option is D

Solution and Explanation

Vivipary is shown by all mammals except monotremes (Platypus and echidna) All mammals do not have Biconcave $RBCs$, example Camel has ovaloid $RBCs$. Elephants do not have extra abdominal testes and four-chambered hearts are not exclusive to Mammals. Heterodont teeth and $12$ cranial nerves are both not exclusive to mammals as they can be found in other animal groups too. Muscular diaphragm and mammary glands are the only characteristics having no exceptions and are exclusive to mammals. So the correct answer is '$A$ muscular diaphragm and milk-producing glands'.
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Concepts Used:

Animal Kingdom

Animals are eukaryotic, multicellular species that belong to the Kingdom Animalia. Every animal has a distinct characteristic. They get energy either by feeding on plants or on other animals. There are millions of species that have been recognized, few shares similar characteristics while others vary drastically.

Kingdom Animalia comprises all animals. In the midst of the five kingdoms, the largest kingdom is the animal kingdom. Animals are multicellular eukaryotes. Though, like plants, they do not possess chlorophyll or a cell wall. Therefore, members of the animal kingdom indicate a heterotrophic mode of nutrition. Kingdom Animalia is further classified into ten different subphyla based on their body designs or differentiations.

The different phyla of the Kingdom Animalia are as follows:

  1. Porifera
  2. Coelenterata (Cnidaria)
  3. Platyhelminthes
  4. Nematoda
  5. Annelida
  6. Arthropoda
  7. Mollusca
  8. Echinodermata
  9. Hemichordata
  10. Chordata

Read More: Classification of Animal Kingdom