Tag: annelida

Quizzes (2) Questions (22)

Questions Related to annelida

Multiple choice zoology structural organization of animals structural organization of leech phylum annelida annelida structural organization of rabbit

Which one exhibits concentric tube-within- tube plan?

  1. Arthropoda

  2. Oligochaeta/Earthworm

  3. Mollusca

  4. Echinodermata
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The tube-within-a-tube body plan refers to an organism having a digestive tract with two openings (mouth and anus), which is characteristic of annelids like earthworms.

Multiple choice zoology structural organization of animals structural organization of leech phylum annelida annelida structural organization of rabbit

The common larva of polychaeta/annelida is

  1. Trochophore

  2. Actinotrocha

  3. Glochidium

  4. Tornaria
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Trochophore, also called trochosphere, small, translucent, free-swimming larva characteristic of marine annelids and most groups of mollusks. Trochophores are spherical or pear-shaped and are girdled by a ring of cilia (minute hairlike structures), the prototroch, that enables them to swim.  Each segment bears a pair of paddle-like and highly vascularized parapodia, which are used for movement and, in many species, act as the worm's primary respiratory surfaces. Bundles of bristles, called setae, the project from the parapodia.

So the correct answer is 'Trochophore'.