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Answers
Answer:
PART -c
1) Characteristic features of Phylum Arthropoda
The body structure shows bilateral symmetry.
They are triploblastic.
They can be found in all types of habitats – land, water and soil.
They have jointed limbs.
The body is segmented into three regions – Head, Thorax and Abdomen.
The body cavity is filled with blood and is called the haemocoel. The blood is white in colour.
The exoskeleton is hardened and is made of chitin.
They have a well-developed central nervous system.
The head is well developed and bears the sensory organs and brain.
They have compound eyes and mosaic vision.
The digestive tract is complete with the mouth and anus at opposite ends of the body.
They have an open circulatory system with dorsal heart and arteries.
Respiration is through the general body surface or by gills in aquatic forms and through trachea or book lungs in terrestrial forms.
Sexes are separate and sexual dimorphism is exhibited.
part -d
4) The dangers of molting! ... It's all too easy for an arthropod to tear off an eyeball or leg, or to get stuck (leading to death) while shedding its armor. This horseshoe crab died while molting. When and if the arthropod manages to free itself, it will be largely incapacitated while its armor hardens.
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