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Aschelminths Overview
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Aschelminths Overview
Aschelminths Overview
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1
Question
What is a pseudocoelom in Aschelminths?
Answer
A body cavity not fully lined with mesoderm, acting as a hydrostatic skeleton.
2
Question
Which phyla are included in pseudocoelomate aschelminths?
Answer
Nematoda, Rotifera, Gastrotricha, Kinorhyncha, and others.
3
Question
Describe the body symmetry of aschelminths.
Answer
Bilateral symmetry.
4
Question
What type of digestion system do aschelminths have?
Answer
Complete digestive tract.
5
Question
Name two phyla of the Aschelminths with examples.
Answer
Nematoda (e.g., Ascaris, hookworms), Rotifera (e.g., rotifers).
6
Question
What is the significance of the cuticle in aschelminths?
Answer
It covers the body, providing protection and flexibility.
7
Question
What is the mode of reproduction in rotifers under normal conditions?
Answer
Parthenogenesis, developing from unfertilized eggs.
8
Question
What size range do most rotifer species fall into?
Answer
200 to 500 micrometers, with some exceeding a millimeter.
9
Question
What is a key feature of rotifer respiratory and circulatory systems?
Answer
They lack circulatory and respiratory systems.
10
Question
What parts primarily compose a rotifer?
Answer
Head (corona, eyespot), neck (trophi), trunk (vitellarium, stomach), foot (toe).
11
Question
What is the function of the corona in a rotifer?
Answer
It creates water currents with cilia to sift food.
12
Question
How does the part called 'vitellarium' function in rotifers?
Answer
It produces yolk for developing eggs.
13
Question
What are the main body parts of Kinorhyncha?
Answer
Head, Neck, Trunk.
14
Question
What is the role of scalids in Kinorhyncha?
Answer
They are spines on the head used in movement.
15
Question
Describe the body segmentation of Kinorhyncha's trunk.
Answer
Divided into 11 segments with plates called zonites.
16
Question
What does 'Acanthocephala' mean in Greek?
Answer
'Spiny head', referring to the thorny proboscis.
17
Question
How do acanthocephalans attach to their host's intestine?
Answer
Using a retractable proboscis with hooks.
18
Question
What are the two major classes in Acanthocephala?
Answer
Archiacanthocephala and Palaeacanthocephala.
19
Question
What is the primary difference between Phasmidia and Aphasmidia in Nematoda?
Answer
Presence of phasmids; phasmidia have them, aphasmidia lack them.
20
Question
What reproductive trait is characteristic of Aphasmidia (Adenophorea)?
Answer
Generally lack excretory system and phasmids.
21
Question
What is the defining feature of Palaeacanthocephala?
Answer
Long-spined proboscis, affecting aquatic hosts.
22
Question
What is a key feature of Eoacanthocephala?
Answer
Simple reproductive systems, parasitizing amphibians and fish.
23
Question
Describe the life cycle of acanthocephalans.
Answer
Involves two hosts: an insect or crustacean intermediate, and a vertebrate definitive host.
24
Question
When were Loricifera discovered?
Answer
In 1983.
25
Question
What habitat do Loricifera occupy?
Answer
Marine sediments in deep waters.
26
Question
What is the body structure of Loricifera?
Answer
Divided into introvert, neck, and trunk; capable of withdrawal and movement via spines.
27
Question
How do Loricifera feed?
Answer
Piercing plants or animals with stylets and sucking body fluids.
28
Question
What is the body cavity type of Loricifera?
Answer
Most larvae are acoelomates, adults are pseudocoelomates.
29
Question
What defines a pseudocoelom in Aschelminths?
Answer
A body cavity partially lined with mesoderm, serving as a hydrostatic skeleton.
30
Question
Which phyla are classified as pseudocoelomate Aschelminths?
Answer
Includes Nematoda, Rotifera, Gastrotricha, Kinorhyncha, and others.