The Fetal circulatory system is unique during pregnancy before the lungs first come into use at birth. Its circulatory system must reorient itself to send all the blood through the lungs to receive oxygen. The baby is cut off from the placenta, which was previously its only source of nourishment. The blood vessels that ran through the umbilical cord constrict and close. All this happens in a few moments when the baby is born.

Correct Option: D

The Fetal circulatory system is unique during pregnancy before the lungs first come into use at birth. Its circulatory system must reorient itself to send all the blood through the lungs to receive oxygen. The baby is cut off from the placenta, which was previously its only source of nourishment. The blood vessels that ran through the umbilical cord constrict and close. All this happens in a few moments when the baby is born.

Glucose is used in silvering of mirror as a reducing agent. Aldehydes such as glucose reduce Ag+ (aq) ions to metallic silver. They themselves are oxidised to carboxylate ions.

Correct Option: C

Glucose is used in silvering of mirror as a reducing agent. Aldehydes such as glucose reduce Ag+ (aq) ions to metallic silver. They themselves are oxidised to carboxylate ions.

Chocolate absorbs lead from the environment during production. Recently there has been concern of mild lead poisoning for some types of chocolate.

Correct Option: D

Chocolate absorbs lead from the environment during production. Recently there has been concern of mild lead poisoning for some types of chocolate.

Cirrhosis is scarring of the liver and poor liver function. It is the final phase of chronic liver disease which may result from a history of excess drinking habits. Cirrhosis is most commonly caused by alcoholism, hepatitis B and hepatitis C, and fatty liver disease.

Correct Option: B

Cirrhosis is scarring of the liver and poor liver function. It is the final phase of chronic liver disease which may result from a history of excess drinking habits. Cirrhosis is most commonly caused by alcoholism, hepatitis B and hepatitis C, and fatty liver disease.

Most fish are able to control their bouyancy with a swim bladder (an internal sac they can fill with gas or water) or by other means, so that they have a specific gravity exactly the same as the water they swim in. By small adjustments to their buoyancy, they can float to a higher level or sink lower with a very small expenditure of energy.

Correct Option: C

Most fish are able to control their bouyancy with a swim bladder (an internal sac they can fill with gas or water) or by other means, so that they have a specific gravity exactly the same as the water they swim in. By small adjustments to their buoyancy, they can float to a higher level or sink lower with a very small expenditure of energy.