write down the characteristics of arthropoda and porifera
Answers
Answer:
arthropoda
They possess an exoskeleton.
They have jointed appendages.
Their body is segmented.
They are bilaterally symmetrical.
They possess an open circulatory system.
porifera
The cells of Poriferans are loosely organized.
They are mostly found in marine water. Only a few are found in freshwater.
They are either radially symmetrical or asymmetrical.
Their body is usually cylindrical.
The scleroblast secretes spicules while spongin fibres are secreted by spongioblasts.
They have no organs in their body.
They depict cellular grade of organization.
The body comprises numerous pores known as Ostia and osculum.
The central cavity is called spongocoel or atrium which opens to the outside through the osculum.
They reproduce asexually by budding, and fragmentation.
The nutrition is holozoic.
They have neurosensory cells but are devoid of any specific nervous system.
They have the power to regenerate the lost parts.
The development is indirect and the cleavage is holoblastic.
The exchange of respiratory gases and nitrogenous wastes occurs by the process of diffusion.
Explanation:
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The characteristics of all arthropods and Porifera are-
ARTHROPODS
-Their body is bilaterally symmetrical.
-They are triploblastic with body .segmented in three I.e head, thorax and abdomen.
-Have jointed appendages which help in movement.
-Exoskeleton is hard and made of chitin.
-They can be both Aquatic and Terrestrial.
-They have open circulatory system with dorsal heart.
-They show sexual dimorphism.
PORIFERA
-There cells are loosely organized.
-They are mostly marine.
-They have cellular level of body organization.
-Their body contains number of pores called ostia and osculum and have a central cavity called spongiform.
-They reproduce asexually.
-Indirect development
- They respire and excrete through simple diffusion.