Porifera and Cnideria quiz #2 Flashcards
Porifera and Cnideria quiz #2
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Which of the following is a characteristic of cnidarians? A) Bilateral symmetry B) Presence of cnidocytes C) Closed circulatory system D) Exoskeleton made of chitin
B) Presence of cnidocytes What are cnidocytes?
Cnidocytes are specialized stinging cells found in cnidarians, containing nematocysts that can fire a penetrating barb to capture prey. How do sponges feed?
Sponges feed by filter feeding, drawing water through their bodies and capturing suspended food particles with choanocytes, which then perform phagocytosis. How do sponges eat?
Sponges eat by using choanocytes to capture food particles from water and digest them intracellularly through phagocytosis. Which type of cnidarians only have the polyp form? A) Jellyfish B) Sea anemones C) Corals D) Hydra
D) Hydra What is the process of asexual reproduction in sponges?
Sponges reproduce asexually through budding, where a new individual grows from the body of the parent sponge. Which of the following is not a feature common to all cnidarians? A) Radial symmetry B) Gastrovascular cavity C) Cnidocytes D) Bilateral symmetry
D) Bilateral symmetry How do sponges get nutrients?
Sponges get nutrients by filtering water through their bodies, capturing food particles with choanocytes, and digesting them intracellularly. What occurs when a cnidarian stinging cell (cnidocyte) is touched?
When a cnidocyte is touched, it triggers the nematocyst to fire a barb that can penetrate and immobilize prey. How and what do sponges eat?
Sponges eat by filtering water to capture bacteria and suspended particles using choanocytes, which digest the food intracellularly. How do sponges obtain food?
Sponges obtain food by filtering water through their bodies, capturing food particles with choanocytes, and digesting them intracellularly. How do sponges get their food?
Sponges get their food by drawing water through their bodies, capturing food particles with choanocytes, and digesting them intracellularly. Why are ostia important to sponges?
Ostia are important to sponges because they are the small openings through which water enters the sponge's body, allowing for filter feeding. What are the defining characteristics of the phylum Porifera?
The defining characteristics of Porifera include being hermaphroditic filter feeders with a spongocoel, choanocytes, and the ability to reproduce both sexually and asexually. How do sponges attain food?
Sponges attain food by filtering water through their bodies, capturing food particles with choanocytes, and digesting them intracellularly. Cnidarians and sponges have which of the following in common? A) Radial symmetry B) Filter feeding C) Aquatic habitat D) Bilateral symmetry
C) Aquatic habitat What are the two body forms of cnidarians?
The two body forms of cnidarians are polyps and medusae. What are the main structural and functional features of Porifera (sponges) that distinguish them from other animal phyla?
Porifera are hermaphroditic filter feeders with a central cavity called the spongocoel, lined with flagellated choanocytes for feeding by phagocytosis. They reproduce both sexually and asexually, have a gelatinous mesohyl containing amoebocytes for support and nutrient transport, and lack true tissues and organs. Describe the two main body forms found in Cnidaria and explain how they differ in structure and lifestyle.
Cnidarians have two main body forms: the polyp, which is cylindrical, usually attached to a surface, and feeds while stationary; and the medusa, which is umbrella-shaped, free-swimming, and has tentacles and the mouth on the underside. Polyps can detach to move, while medusae are typically mobile.
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