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2.  In frog sexes are separate. Male and female frogs can be morphologically
distinguished. The male frog have vocal cords which enable them to make a
croaking noise to attract the females during the rainy, breeding season.
FEMALE
MALE

3. REPRODUCTIVE ORGANS OF MALE FROG
 In the male frog the principal reproductive organs are a pair of testes and the accessory
reproductive
organs are :
1. Vasa Efferentia,
2. Bidder's Canal,
3. Collecting Tubules,
4. Urinogenital Ducts,
5. Cloaca and
6. Cloacal Aperture.

4. Male reproductive organs consists 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 and after arising from testes run
through the mesorchium and enter the kidneys of their side.
In kidneys, these open into Bidder's canal, which finally communicates
with the urinogenital duct.
This duct emerges from the kidneys and finally opens into thecloaca. The
cloaca is a small, median chamber that is used to pass faecal matter,
urine and sperms to the exterior.

5. REPRODUCTIVE ORGANS OF FEMALE FROG
 In the female frog the principal reproductive organs are a pair of ovaries and the
accessory reproductive
organs are :
1. A pair of Oviducts,
2. Cloaca and
3. Cloacal Aperture.

6. Ovary
In the young frog each ovary is small, flat and lobulated. In adult frog this is the
same case during the period of year other than breeding season.
The ovary is enveloped by mesovarium, a thin layer of peritoneum. Several
hollow sac-like structures form the ovary.
The lobulated appearance of the ovary due to those structures. Initially the
color of the ovary is yellowish with small black spots. The lumen of the ovary is
part of the coelom. It is filled with coelomic fluid.
During the breeding season the wall of the ovary becomes studded with a large
number of ovarian follicles. Each Ovarian Follicle contains a developing Egg.
The ovarian follicles project towards the lumen of ovary. Such an ovary greatly
enlarges. It attains black color with light yellow spots.

7. Each oviduct is a long narrow and highly coiled tube.
It is divided into three parts in accordance with its structure and functions
1. Oviducal Funnel,
2. Oviduct
3. Ovisac.
The anterior end of the oviduct forms a wide and fringed oviducal funnel. The
ovoiducal funnel is located on the dorsal side of the lung.
The margin and inner surface of the oviducal funnel is lined by ciliated epithelium.
The oviducal funnel leads into the oviduct. This oviduct is straight and thin-walled
for a short distance. Thereafter it becomes highly coiled and thick-walled. This coiled
oviduct runs posteriorly along the outer side of the kidney.
The hinder portion of the oviduct becomes very thin walled. It is sac-like and is called
ovisac. The ovisac opens of the posterior end in the dorsal wall of the cloaca by its
individual apertures lying anteriorly to the openings of ureters.
The cloaca opens to the exterior by a cloacal aperture at the posterior end of the body.