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Iodine deficiency in frog tadpole will lead to
Option: 1
Accelerated metamorphosis
Option: 2
Development of a giant frog
Option: 3
Inhibition of metamorphosis
Option: 4
Development of a miniature frog
Answers (1)
Reproduction and Development in Frog -
- Frogs have well-organised male and female reproductive systems.
Male Reproductive System
- Male reproductive organs consist of a pair of yellowish ovoid testes which are found adhered to the upper part of kidneys by a double fold of peritoneum called mesorchium.
- Vasa efferentia are 10-12 in number that arises from testes.
- They enter the kidneys on their side and open into Bidder’s canal.
- Bidder's canal is present inside the kidney of the frog. It receives sperms from testes via a number of vasa efferentia.
- Vasa efferentia communicates with the urinogenital duct that comes out of the kidneys and opens into the cloaca.
- The cloaca is a small, median chamber that is used to pass faecal matter, urine and sperms to the exterior.
Female Reproductive System
- The female reproductive organs include a pair of ovaries.
- The ovaries are situated near kidneys and there is no functional connection with kidneys
- A pair of oviduct arising from the ovaries opens into the cloaca separately.
- A mature female can lay 2500 to 3000 ova at a time.
- Fertilisation is external and takes place in water. Development involves a larval stage called tadpole.
- Tadpole undergoes metamorphosis to form the adult.
-
There is a role of thyroxine (precursores are iodine and tyrosine amino acid) in metamorphosis of amphibian tadpoles. The deficiency of thyroxine retards metamorphosis and larval life continues.
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