OESOPHAGUS STOMACH
ECHINODERMS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Bilateral
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Radial
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Bilateral and Radial
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They are not symmetrical
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Detailed explanation-1: -In this respect, arthropods are built like humans are; the right half of an arthropod is a mirror image of its left half-this is called bilateral symmetry (bi = two, latus = side).
Detailed explanation-2: -Bilateral symmetry involves the division of the animal through a sagittal plane, resulting in two mirror-image, right and left halves, such as those of a butterfly, crab, or human body. Animals with bilateral symmetry have a “head” and “tail” (anterior vs. posterior), front and back (dorsal vs.
Detailed explanation-3: -Ciba Found Symp. 1991; 162:94-120; discussion 121-7.
Detailed explanation-4: -The vast majority of animals display bilateral symmetry; also known as plane symmetry, this is a trait that applies to 99% of all animals, in the majority of phyla: Chordata, Annelida, Arthropoda, Platyzoa, Nematoda, and most Mollusca.