Minor phyla – Ctenophora, Rotifera, Chaetognatha, Onychophora, Siphunculida, Entoprocta, Ectoprocta, Phoronida - Question Bank
1. The segmented body and unjointed appendages of Onychophora suggest a possible evolutionary link between:
2. The 'arrow worm' body plan is adapted for:
3. Which phylum lacks a true coelom and exhibits a simple body plan with a U-shaped digestive tract?
4. The 'corona' in Rotifera serves the dual purpose of:
5. Which phylum is characterized by a complete digestive system and a hydrostatic skeleton, enabling burrowing in soft substrates?
6. The body cavity of Phoronids is a:
7. In Ectoprocta, the individual units forming the colony are called:
8. The presence of metanephridia for excretion is characteristic of which of the following minor phyla?
9. The nervous system of Chaetognaths is considered relatively simple, consisting of a cerebral ganglion and a ventral nerve cord with:
10. The larval stage of some Rotifers, known as the amictic egg, develops into:
11. Which phylum is considered a 'living fossil' due to its ancient lineage and unique morphological features, bridging annelids and arthropods?
12. The symbiotic relationship between Phoronids and certain algae within their tubes is an example of:
13. A key difference between Entoprocta and Ectoprocta lies in the position of the anus relative to the:
14. The proboscis of Siphunculida is used for:
15. Which phylum exhibits a nervous system with a distinct cerebral ganglion and a ladder-like arrangement of nerves in the body wall?
16. The mastax in Rotifera is homologous to which structure in other invertebrates?
17. Which of the following is NOT a characteristic feature of Ctenophora?
18. Phoronids possess a unique blood-vascular system with a dorsal and ventral blood vessel and a:
19. The body of Phoronids is divided into two regions: a shorter anterior section bearing the lophophore and a longer posterior section that:
20. Phoronids are commonly known as:
21. Which phylum contains sessile, worm-like marine animals that live in chitinous tubes and possess a U-shaped lophophore for feeding?
22. Ectoprocts are members of which larger superphylum, characterized by the presence of a lophophore?
23. The feeding structure in Ectoprocta, a horseshoe-shaped or circular arrangement of ciliated tentacles, is called the:
24. A distinguishing feature of Ectoprocta is that the anus is located:
25. Ectoprocts are also commonly known as:
26. Which phylum consists of sessile, colonial, aquatic invertebrates that typically form encrusting or branching colonies and are often called 'moss animals'?
27. Entoprocts reproduce both sexually and asexually. Asexual reproduction typically occurs via:
28. In Entoprocta, the anus is located:
29. Entoprocts are sometimes called:
30. Which phylum consists of small, sessile, colonial or solitary marine animals with a characteristic calyx (cup-shaped body) and a retractile stalk?
31. Siphunculids are typically:
32. The anterior end of a Siphunculid, bearing the mouth and the retractable proboscis, is called the:
33. Siphunculids are commonly known as:
34. Which phylum comprises marine, unsegmented worms with a retractable, muscular proboscis used for burrowing and feeding?
35. The circulatory system in Onychophora is:
36. A distinctive feature of Onychophora is the presence of slime glands that secrete a sticky substance for:
37. Onychophorans are often called:
38. Which phylum contains terrestrial, soft-bodied, centipede-like animals with unjointed legs and a segmented body covered by a cuticle?
39. Chaetognaths are important components of marine ecosystems primarily as:
40. The grasping spines used by Chaetognaths for capturing prey are located around the:
41. Chaetognaths are commonly known as:
42. Which phylum consists of small, planktonic marine predators with a distinctive arrow-like shape and a grasping apparatus?
43. Many species of Rotifera exhibit parthenogenesis. What does this mean?
44. The characteristic feeding apparatus in Rotifera used to sweep food particles into the mouth is called the:
45. Rotifers are commonly referred to as:
46. Which phylum is characterized by a corona, a ciliated structure used for both locomotion and feeding?
47. The body plan of Ctenophora exhibits:
48. What unique feature do Ctenophores possess for capturing prey, typically consisting of colloblasts or tentacles?
49. Members of the phylum Ctenophora are commonly known as:
50. Which phylum is characterized by the presence of comb plates (ctenes) for locomotion and biradial symmetry?