5682013
| Question | Answer |
| ⏩TYPES OF CIRCULATORY SYSTEM | ✔OPEN TYPE: in which the blood is pumped out of the heart and the cells and tissues are directly bathed in it and ✔CLOSED TYPE: in which the blood is circulated thriugh a series of vessels of varying diameters (arteries,veins & capillaries) |
| ⏩DIPLOBLASTIC & TRIPLOBLASTIC ORGANISATIONS | ✔DIPLOBLASTIC Animals in which thses cels are arranged in two embryonic layers, an external ectoderm and internal endoserm, are called diploblastic animals. E.g., coelentrates. ✔TRIPLOBLASTIC Animals in which the developing embryo has a third germinal layer, mesderm in between the ectoderm & endoderm are called triploblastic animals. E.g., platyhelminthes - chordates |
| ⏩PSEUDOCOELOMATES | ✔In some animals, the body cavity is not lined by mesoderm instead, the mesoderm is presrnt as scattered pouches in between the ectoderm & endoderm. Such a body cavity is called pseudocoelom & the the animals possessing them are called pseudocoelomates. E.g. Aschelminthes |
| ⏩ACOELOMATES | ✔The animals which the body cavity is absent are called acoelomates. E.g., platyhelminthes |
| ⏩SEGMENTATION | ✔The body is externally & internally divided into segments with a serial repitation of at least some organs. E.g., earthworm |
| ⏩METAMERISM | ✔The phenomenon of the body of an earthworm showing the pattern called metameric segmentation is known as metamerism. |
| ⏩NOTOCHORD | ✔A mesodermally derived rod-like structure formed on the dorsal side during embryonic development in some animals. |
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