Differentiate between:
a. Open circulatory system and closed circulatory system
b. Oviparous and viviparous characteristic
c. Direct development and Indirect development

Answers (1)

a) In the open circulatory system, blood is pumped out the heart, and the cells and tissues are directly bathed whereas in the closed circulatory system blood is circulated throughout the body with the help of series of vessels. Examples of the open circulatory
system are Arthropods and Mollucus. Examples of the closed circulatory system are Annelids and Vertebrates.

b) Oviparous refers to Laying of fertilised and unfertilised eggs, whereas viviparous refers to giving birth to young ones. Reptiles, birds, and some mammals fall into oviparous whereas Scolidon and most mammals fall into the category of viviparous.

c) Direct development refers to a form when a larval stage is absent in the development of the organism. In simple words, when the young ones resemble the adult, it is direct development, for example, mammals, reptiles, etc.

Indirect development refers to when the larval stage is present in the development of the organism which does not resemble the adult. In other words, when the young ones are different than the adults, this is indirect development, for example, frog, cockroach,silkworm.
 

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