- What is the importance of copepods in marine ecosystem?
- Give general characteristics of Phylum Arthropoda.
- What is common between Arthropods and Annelids?
- What arc the advantages of exoskeleton?
- Describe the composition of cuticle.
- Give different modifications in cuticle.
- Describe molting or ecdysis in Arthropods.
- Describe metamorphosis in Arthropods.
- Gist classification of Arthropods.
- Discuss further phylogenetic consideration of Arthropods
1. Give two major characteristics of Phylum Arthropoda.
Ans: Chitinous exoskeleton provides support and protection. It is modified to form sensory structures. They have paired jointed appendages.
2. What type of blood vascular system is present in Arthropods?
Ans: They have open circulatory system. Blood is released into tissue space; haemocoel derived from the blastocoel.
3. What is the significance of metamorphosis?
Ans: It reduces competition between immature and adult stages.
4. Name three sub-phylum of Arthropoda.
Ans: Chelicerata, Crustacea, Uniramia and Trilobitomorpha.
5. What is chitin?
Ans: Chitin is a tough leathery polysaccharide.
6. What is Sclerotization?
Ans: It is a tanning process in which layers of protein is chemically cross-linked with one another. It hardens and darkens the exoskeleton.
7. What is ecdysis or molting?
Ans: The periodic shedding of e ()skeleton for growth in arthropods is called molting process called ecdysis.
8. What is metamorphosis?
Ans: The radical change in body born and physiology from immature larval stage to adult is called metamorphosis.
9. What is meant by biramous appendages?
Ans: In this case, each appendage has two branches.
10. Name the classes of Sub — phylum Chelicerata?
Ans: Merostomata, Arachnida and Pycnogonida.
11. Name the classes of Sub — phylum Chelicerata.
Ans: Class Remipedia, Cephalocarida, Class Branchiopoda, Class Malacostraca, Class Copepods and Class Cirripedia.