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Consider the following statements regarding Sea Urchins:
  1. They are marine invertebrates found on oceans floors worldwide.
  2. They include marine creatures like starfish and sea cucumbers.
Which of the statements given above is/are correct?
  • a)
    1 only
  • b)
    2 only
  • c)
    Both 1 and 2
  • d)
    Neither 1 nor 2
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
Consider the following statements regarding Sea Urchins: They are mari...


Sea Urchins

1. They are marine invertebrates found on oceans floors worldwide:
Sea urchins are indeed marine invertebrates that can be found on ocean floors all around the world. They belong to the phylum Echinodermata and are characterized by their round, spiny bodies.

2. They include marine creatures like starfish and sea cucumbers:
While sea urchins are related to starfish and sea cucumbers in the sense that they all belong to the phylum Echinodermata, they are not the same creatures. Sea stars (starfish) and sea cucumbers are different from sea urchins in terms of their physical characteristics and behaviors.

Therefore, both statements are correct in the context that sea urchins are marine invertebrates found on ocean floors worldwide, and they are related to other marine creatures like starfish and sea cucumbers within the phylum Echinodermata.
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Consider the following statements regarding Sea Urchins: They are mari...
The Red Sea's spectacular coral reefs face a new threat, marine biologists warn—the mass death of sea urchins that may be caused by a mystery disease.
About Sea Urchins:
  • Sea urchins belong to a group of marine invertebrates called echinoderms, which means spiny-skinned animals. 
  • It includes other well-known marine creatures like starfish and sea cucumbers.
  • Sea urchins are characterized by their spherical to somewhat flattened, spiny bodies, and they are found in oceans worldwide, from shallow coastal waters to deep-sea environments.
  • They live on the ocean floor, usually on hard surfaces, and use tube feet or spines to move about.
  • The largest urchin (known from a single specimen) is Sperostoma giganteum of deep waters off Japan.
  • Features:
  • They have a globular body and a radial arrangement of organs, shown by five bands of pores running from mouth to anus over the test (internal skeleton).
  • The pores accommodate tube feet, which are slender, extensible, and often sucker-tipped. 
  • They have a hard exoskeleton, or test, made up of interlocking plates or ossicles, which are often covered with movable spines.
  • From nodules on the test arise long, movable spines and pedicellariae (pincerlike organs); these structures may have poison glands. 
  • Feeding:
  • They are herbivorous, primarily feeding on algae and plant material.
  • They use their specialized mouthparts, called Aristotle's lantern, to scrape algae and other food sources from rocks or the seafloor.
Hence both statements are correct.
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Consider the following statements regarding Sea Urchins: They are marine invertebrates found on oceans floors worldwide. They include marine creatures like starfish and sea cucumbers.Which of the statements given above is/are correct?a)1 onlyb)2 onlyc)Both 1 and 2d)Neither 1 nor 2Correct answer is option 'C'. Can you explain this answer?
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