Question

(D) MolluscaAnmer very briefly1 Define taxonomy.2. What is nematocyst?3. Why coelenterates are called diploblasanimals?4 List the respiratory organs of amphibian5. How does locomotion take placestarfish?6 Are jellyfish and starfish similar​

Answer 1

Here is your answer:

1: Mollusca: It is the second largest phylum. They are terrestrial or aquatic animals (marine or fresh). they are bilaterally symmetrical, triploblastic and coelomate animals. Their body is mainly divided into head, muscular foot and visceral hump. The cavity between the hump and the mantle is known as mantle cavity. Their mouth is called radula. They have separate sexes. They are oviparous, and have indirect development.

2: Taxonomy: Taxanomy is the science of naming, describing and classifying organisms and includes all plants, animals and microorganisms of the world.

3: Nematocysts: They are also known as cnidarians. They have an explosive cell containing one giant secretory organelle called cnidocyst. Cnidae are used to capture their prey.

4: Celoentrates are called diploblastic animals because they dont have a mesoderm. They only contain ectoderm mesoglea and endoderm.

5: Respiration takes place in amphibians through gills, lungs and skin.

6: Locomotion takes place in starfish through the water vascular system.

7: Jellyfish and starfish dont have brains also they both lack a skeleton. They are not fishes, they are marine animals.

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