Which phylum is characterized by stinging cells (Hard) called cnidocytes (nematocysts) and metagenesis (alternation of polyp and medusa)?
Answer and explanation
Correct answer: D. Cnidaria
- Step 1: Cnidarians (such as Hydra, Obelia, and Aurelia) are diploblastic radial metazoans. Step 2. They possess specialized stinging organelles called nematocysts (inside cnidocytes) for prey capture and defense. Answer: Cnidaria (Coelenterata). Why not the others: Porifera has choanocytes and spicules; Ctenophora has colloblasts and comb plates; Echinodermata has water vascular system and pedicellariae.
Practise more Human Physiology and Animal Diversity.
Free questions with an explanation for every one, and full timed Medical College Admission Test (Bangladesh) mock tests.
More Human Physiology and Animal Diversity questions
- Which specialized cardiac tissue serves as the primary natural pacemaker of the human heart?
- What is the normal resting blood pressure of a healthy human adult measured in millimeters of mercury (mmHg)?
- What is the primary form in which carbon dioxide is transported from body tissues to the lungs in human blood? (Hard)
- What is the Hamburger phenomenon (Chloride Shift) during carbon dioxide transport in blood? (Hard)
- Which enzyme secreted by the chief cells of the gastric mucosa initiates protein digestion in the human stomach?
- Where is bile synthesized, and where is it stored and concentrated before release into the duodenum?