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12th Grade > Biology

ANIMAL KINGDOM MCQs

Total Questions : 53 | Page 6 of 6 pages
Question 51. Among the following, the common character found in all chordates is
  1.    Feathers
  2.    Lungs
  3.    Dorsal nerve cord
  4.    Diaphragm
 Discuss Question
Answer: Option C. -> Dorsal nerve cord
:
C
Notochord, dorsal hollow nerve cord, paired pharyngeal gill slits and post-anal tail are the primary chordate characters found in all members of Phylum Chordata. Feathers, lungs and diaphragm are all characters found in higher chordates such as birds and mammals.
Question 52. I am a triploblastic invertebrate with a hard exoskeleton. I have an asymmetrical body plan, but many of my cousins are bilaterally symmetrical. I belong to the phylum
  1.    Annelida
  2.    Arthropoda
  3.    Echinodermata
  4.    Mollusca
 Discuss Question
Answer: Option D. -> Mollusca
:
D
Phylum Mollusca includes organisms which have a hard calcareous exoskeleton (shell), and are triploblastic. Some molluscs have an asymmetrical body plan, especially in the adult stage, although many of them are bilaterally symmetrical. Annelids and arthropods are usually bilaterally symmetrical, while echinoderms are radially symmetrical (in the adult stage).
Question 53. Animals like annelids and arthropods show
  1.    Asymmetry
  2.    Radial symmetry
  3.    Bilateral symmetry
  4.    All of these
 Discuss Question
Answer: Option C. -> Bilateral symmetry
:
C
Annelids and arthropods are bilaterally symmetrical, that is, the body can be divided into two identical halves only along one imaginary plane.

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