Give reasons for the following. 1. Respiratory and circulatory system

1.	Give reasons for the following. 1. Respiratory and circulatory system are absent in parasitic platyhelminthes and Aschelminthes.2. Arthropods are the most successful invertebrate. 3. Body of endoparasites are covered with cuticle.
Answer» 1. Parasitic Plalyhelminthes and Aschelminthes lives in anaerobic condition. So respiratory and circulatory systems are absent in these parasitic forms. 2. Arthropods are most successful, because of the presence of unique chitinous cuticle. 3. In these parasites, the cuticle helps in escaping from the action of digestive enzymes.

Give reasons for the following. 1. Respiratory and circulatory system are absent in parasitic platyhelminthes and Aschelminthes.2. Arthropods are the most successful invertebrate. 3. Body of endoparasites are covered with cuticle.

Answer»

1. Parasitic Plalyhelminthes and Aschelminthes lives in anaerobic condition. So respiratory and circulatory systems are absent in these parasitic forms.

2. Arthropods are most successful, because of the presence of unique chitinous cuticle.

3. In these parasites, the cuticle helps in escaping from the action of digestive enzymes.

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Give reasons for the following. 1. Respiratory and circulatory system are absent in parasitic platyhelminthes and Aschelminthes.2. Arthropods are the most successful invertebrate. 3. Body of endoparasites are covered with cuticle.

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