Animal Tissue and Anatomy

Eardrum is the thin stretched membrane at the end of inner ear , which vibrates when sound wave strikes it .

All of the options are correct.

The oviducts present in amphibians are simple tubes which are lined with glands that produce mucus and jelly. Oviducts in male frogs are vestigial oviducts as they have no specific function and no role in reproduction. However, in female, oviduct responds to ovarian or female sex hormones by enlarging and acquiring a lumen. Oviducts carries egg to the cloaca. This posterior opening is the common exit for intestinal, urinary and reproductive tracts. The oviduct of the female is known as the rudimentary oviduct or Mullerian duct. This duct has no lumen and is very much reduced in size. Due to small size, it is difficult to locate these ducts. 

Vocal sacs are prominent in a male frog. It is composed of flexible skin which easily expands or contracts to change the frequency of sound waves and helps in amplification. The sound produced is a call for mating. The presence or development of the vocal sac is one way of externally determining the sex of a frog in many species. The vocal sac is open to the mouth cavity of the frog, with two slits on either side of the tongue. To call, the frog inflates its lungs and shuts its nose and mouth. So, the correct answer is option A.

The truncus arteriosus is formed of a basal thick-walled conus arteriosus and a distal thin-walled ventral aorta. Its conus arteriosus part which is next to the ventricle is known as pylangium and the distal ventral part as synangium. Pylangium is a short tubular structure, while synangium is simply formed by the union of the basal parts of the arteries.

In the frog, each kidney is composed of several structural and functional units called uriniferous tubule or nephrons. Two ureters emerge from the kidneys in the male frogs. The ureters act as a urinogenital duct which opens into the cloaca. The thin-walled urinary bladder is present ventral to the rectum which opens in the cloaca.

In the male frog, the final digestion takes place in the intestine. Digested food is absorbed by the numerous finger-like folds in the inner wall of the intestine called villi and microvilli. The undigested solid waste moves into the rectum and passes out through cloaca. Hence the urinogenital duct of the male frog opens into the cloaca.

Larynx (voice box) is located between the pharynx and the trachea. It is the upper modified part of trachea and leads to trachea or windpipe. It has a framework of cartilage that protrudes in the front of the neck and sometimes is referred as the Adams apple. The larynx is considerably larger in males than in females; hence, the Adams apple is much more prominent in males. At the upper end of the larynx, vocal cords are present which help in production of speech. They are set into vibration by the flow of air from the lungs. A difference in the size of the larynx is what accounts for the difference between male and female voices; because male larynx is larger than a female larynx, usually male voice is lower in pitch. The nasal cavities, the sinuses, and the pharynx all serve as resonating chambers for speech, just as the cabinet does for a stereo speaker.

In humans, the larynx is called the voice box. The larynx (voice box) is located between the pharynx and the trachea. It has a framework of cartilage, that protrudes in the front of the neck and sometimes is referred to as Adam's apple. The larynx is considerably larger in the male than in the female; hence, Adam's apple is much more prominent in the male. At the upper end of the larynx are the vocal cords, which serve in the production of speech. They are set into vibration by the flow of air from the lungs. 

In humans, the larynx (voice box) is located between the pharynx and the trachea. It has a framework of cartilage that protrudes in the front of the neck and sometimes is referred to as the Adam's apple. The larynx is considerably larger in the male than in the female. Hence, the Adam's apple is much more prominent in the male. At the upper end of the larynx are the vocal cords, which serve in the production of speech. They are set into vibration by the flow of air from the lungs. A difference in the size of the larynx is what accounts for the difference between the male and female voices; because a man's larynx is larger than a womans, his voice is lower in pitch.

The larynx (voice box) is located between the pharynx and the trachea. It has a framework of cartilage that protrudes in the front of the neck and sometimes is referred to as the Adam's apple. The larynx is considerably larger in the male than in the female; hence, the Adam's apple is much more prominent in the male. In human males ventral surface of thyroid cartilage make up the Adam's apple. 

The Adam's Apple is the common name for the laryngeal prominence, which is a feature of the thyroid cartilage that surrounds the larynx. It is more prominent in males due to hormonal differences.

• The larynx (voice box) is a cartilaginous box which helps in sound production.
  
• It consists of 9 cartilages among them 3 are paired and 3 are unpaired.
• Vocal cords are composed of twin infoldings of mucous membrane stretched horizontally across the larynx. They vibrate, modulating the flow of air being expelled from the lungs during phonation.
• Hence vocal cords occur in Larynx.
• So, the correct answer is 'Larynx'.

The arytenoid cartilages are a pair of small cartilages, shaped roughly like three-sided pyramids, which are located toward the rear of the larynx and play a vital role in positioning and adjusting the vocal folds during speech.