Examkin

Soru

Zorluk: OrtaLower Invertebrates: Porifera, Coelenterata, Platyhelminthes, and Nematoda

Which of the following diagnostic anatomical features distinguishes members of the phylum Coelenterata (Cnidaria) from other lower invertebrate phyla such as Porifera, Platyhelminthes, and Nematoda?

  1. Possession of specialized stinging cells called cnidocytes (nematocysts) embedded in a diploblastic body wallCevap
  2. B
    Possession of flame cells (protonephridia) dedicated to osmoregulation and nitrogenous waste removal
  3. C
    Possession of flagellated collar cells (choanocytes) that line an internal water canal system
  4. D
    Possession of a fluid-filled pseudocoelom that acts as a hydrostatic skeleton

Cevap

The possession of specialized stinging cells called cnidocytes (nematocysts) embedded in a diploblastic body wall is unique to members of the phylum Coelenterata.
Coelenterates (such as Hydra, Obelia, and jellyfish) are characterized by a diploblastic body wall containing specialized stinging cells called cnidocytes (or nematocysts). These cells function in paralyzing prey and providing defensive mechanisms, a feature absent in Porifera, Platyhelminthes, and Nematoda.

Adım Adım Çözüm

1
Analyze the structural organization of Coelenterata (Cnidaria)
Coelenterates are tissue-grade, diploblastic organisms (outer ectoderm and inner endoderm) exhibiting radial symmetry.
Identifying the level of cellular and tissue organization narrows down characteristic features.
2
Identify specialized cell types specific to Coelenterata
Cnidocytes (containing stinging capsules called nematocysts) are present on tentacles and body epidermis for prey capture and defense.
Cnidocytes are unique diagnostic cells found exclusively in Coelenterata.
3
Compare with diagnostic structures of neighboring lower invertebrate phyla
Choanocytes belong to Porifera, flame cells belong to Platyhelminthes, and a pseudocoelom belongs to Nematoda.
Distinguishing distinct specialized structures eliminates wrong choices linked to other lower invertebrate phyla.

Anahtar Kavram

Diagnostic features of lower invertebrate phyla (Coelenterata vs. Porifera, Platyhelminthes, and Nematoda)
Tahmini Süre:1m 0s
Bu soruyu puanla

Konular

Lower Invertebrates: Porifera, Coelenterata, Platyhelminthes, and Nematoda