The structure(s) that open into the pharynx 

The structure which opens in the nasopharynx that permits air pressure on both sides of tympanic membrane of the ear to be kept equal is :-

Write the ring structure and open chain structure of fructose .

Fill in the blanks: 1. The Opening of the stomach in duodenum is regulated by ....a.... 2. Opening of the common hcpato-pancreatic duct is guarded by a structure called ...b…. 3. The structure which prevents the back flow of faecol matter is called ...c... 4. A muscular structure that regulates the opening of oesophagus into stomach is called ..d..

Define transpiration. Explain the structure and mechanism of "opening and closing of stomata.

Identify the part that opens into a tube-like structure called trachea.

The permanently open structures seen on the bark of an old woody stem