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LIFE CYCLE OF FROG #01

Life Cycle of Frog🐸.  #1
 
Hello Readers this is the first blog of my channel and we will discuss about the lifecycle of frog  in this blog. You'll get information in easy to understand in simple basic language all about animals.




SOME DETAILS ABOUT LIFE CYCLE IN SHORT
               THE LIFE CYCLE OF A FROG NORMALLY STARTS IN WATER WITH AN EGG THAT HATCHES INTO A  LIMBLESS LARVA WITH GILLS, COMMONLY KNOWN AS A TADPOLE. AFTER FURTHER GROWTH, DURING WHICH IT DEVELOPS LIMBS AND LUNGS, THE TADPOLE UNDERGOES METAMORPHOSIS IN WHICH ITS APPEARANCE AND INTERNAL ORGANS ARE REARRANGE. AFTER THIS IT IS ABLE TO LEAVE THE WATER AS A MINIATURE, AIR BREATHING FROG.







Frogs life cycle is basically in 4 steps and these steps are as follows;
1) Eggs/Frogspawn
2) Tadpole
3) Froglet
4) Adult Frog 

We will discuss all the process step by step



1) Eggs/Frogspawn:
                              Frogs embryos are typically surrounded by several layers of gelatinous material. When several eggs are clumped together, they are collectively known as frogspawn. The jelly provides support and protection while allowing the passage of oxygen, carbon dioxide ammonia. It absorbs moisture and swells on contact with water. After fertilization, the innermost portion liquifies to allow free movement of the developing embryo. The larvae developing in the eggs can detect vibrations caused by nearby predatory wasps or snakes, and will hatch early to avoid being eaten. In general, the length of the egg stage depends on the species and the environmental conditions Aquatic eggs normally hatch within one week when the capsule splits as a result of enzymes released by the developing larvae.



2) Tadpole:
       The larvae that emerge from the eggs, known as tadpoles or occasionally polliwogs, typically have oval bodies and long, vertically flattened tails. As a general rule, free-living larvae are fully aquatic, but at least one species has semitertestial tadpoles which live among wet rocks. Tadpoles lacks eyelid and have cartilaginous skeletons, lateral line systems, gills for respiration (external gills at first, internal gills later), and vertically flattened tails they use for swimming. From early in its development, a gill pouch covers the tadpole's gills and front legs. The lungs soon start to develop and are used as an accessory breathing organ. Some species go through metamorphosis while still inside the egg and hatch directly into small frogs. The tadpole stage may be as short as a week in explosive breeders or it may last through one or more winters followed by metamorphosis in the spring. 
 


3) Froglet: 
         Froglet is the stage where tadpole body discovers the eyes, hands and legs. In this time froglet slowly starts to come out of the water and develop the habit of both land and water. It is the also stage of metamorphosis where the changes takes place. 



4) Metaporphosis:
          At the end of the tadpole stage, a frog undergoes metamorphosis in which its body makes a sudden transition into the adult form. This metamorphosis typically lasts only 24 hours, and is initiated by production of the hormone thyroxine. This causes different tissues to develop in different ways. The principal changes that take place include the development of the lungs and the disappearance of the gills and gill pouch, making the front legs visible. The eyes are repositioned higher up on the head and the eyelids and associated glands are formed. The eardrum, middle ear, and inner ear are developed. The skin becomes thicker and tougher, the lateral line system is lost, and skin glands are developed.  The final stage is the disappearance of the tail, but this takes place rather later, the tissue being used to produce a spurt of growth in the limbs.Frogs are at their most vulnerable to predators when they are undergoing metamorphosis. At this time, the tail is being lost and locomotion by means of limbs is only just becoming established
 






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