Best Answer: It extracts the chlorophyll so that when you test for strach with iodine the colour change is clear. when u boil a leaf in alcohol, it's chlorophyll dissolves in alcohol, leaving the leaf colourless. now when u test for starch by adding Iodine the colour change in clear. BlueAsh Â· 7 years ago.
Left atrioventricular valve (Mitral valve). The mitral valve is located within the heart. It lies between the left atrium and the left ventricle. The mitral valve opens to increased pressure as the left atrium fills with blood.Blood flows through into the left ventricle as the heart expands (diastole).It then closes as the heart contracts (systole) and forces blood into the aorta.t lies between the left atrium and the left ventricle. The mitral valve opens to increased pressure as the left atrium fills with blood. Blood flows through into the left ventricle as the heart expands (diastole). It then closes as the heart contracts (systole) and forces blood into the aorta.
  The tricuspid valve is located on the right side of the heart between the right atrium and ventricle. The purpose of the valve is to close when the ventricle pumps blood â¦ into the pulmorary arteries that lead to the lungs.he tricuspid valve is a valve situated at the opening of the right atrium of the heart into the right ventricle and that resembles the mitral valve in structure but consists â¦ of 3 triangular membranous flaps.