Bio Flashcards
What are the characteristics of sponges?
Absent tissues & organs, most sponges are hermaphrodites, spicules provide structural support
All sponges do not reproduce asexually.
What is the primary method of reproduction for polyp structures in Cnidaria?
Asexually via budding
What type of symmetry is observed in Cnidaria?
Radial symmetry
What cells produce spicules in sponges?
Sclerocytes
Which class of Cnidaria includes true jellyfish?
Scyphozoa
Which class of Cnidaria includes sea anemones?
Anthozoa
What is Hydroxyapatite used for?
Strengthening & regenerating bones in the face, hands & jaw
Which of the following is a shared feature between Hydra & Sponges?
Absent tissues
What type of symmetry is seen in cnidarians?
Radial Symmetry
What structure in Cnidaria contains cnidocytes?
Tentacles
What is the function of nematocytes?
Release poison & hook potential prey
Fill in the blank: The opening in cnidarians acts as both a _______ and an anus.
Mouth
Which of the following structures is unrelated to cnidarians?
Spicules
What is the umbrella-shaped structure in Cnidaria called?
Medusa
True or False: All sponges reproduce asexually.
False
What is the role of mesoglea in Cnidaria?
Provides structural support between the ectoderm and endoderm
What is a planula in Cnidaria?
A larval stage that develops into a polyp
What type of organism is a sea anemone classified as?
Anthozoa
What characteristics do roundworms possess?
D Pseudocoelomates
Pseudocoelomates have a fluid-filled body cavity separating the gut of the organism from the body wall, but it is not lined by mesoderm, unlike true coelomates.
What characteristic is clearly visible in the cross-section of a roundworm?
B Pseudocoelomate
Roundworms are pseudocoelomates.
What are the characteristics of sponges?
Absent tissues and organs, filter feeders, express intracellular digestion, lack symmetry (asymmetrical), lack a nervous system.
What are sclerocytes?
Cells that produce spicules.
What are spicules?
Needle-like structures made up of silica, spongin (collagen protein), or calcium carbonate, providing rigidity and form to sponges.
How do sponges reproduce?
Most are hermaphrodites and reproduce asexually through fragmentation, budding, and gemmulation.
Which of the following organisms lacks a nervous system?
D Sponge
Sponges lack a nervous system.
Which method of reproduction is not used by sponges?
D Conjugation
Sponges can reproduce both sexually and asexually.
What type of feeders are sponges?
D Filter Feeders
Sponges are filter feeders.
In protostomes, what does the first opening in the gastrula develop into?
C Mouth
In protostomes, the first opening in the gastrula develops into the mouth.
Which of the following is an example of an acoelomate?
A Flatworms
Which organism expresses bilateral symmetry?
B Starfish
Which of the following is not a characteristic of sponges?
D Express intercellular digestion
Sponges express intracellular digestion and not intercellular digestion.
Spicules are formed from all of the following except?
D Keratin
Spicules are formed from silica, spongin, or calcium carbonate. They are not made up of keratin.
