Karl Landsteiner classified human blood into four categories on the basis of proteins (antigens) found on the surface of the RBCs. Compatibility of blood groups must be checked during blood transfusion. Which of the following statements are incorrect ?

P. Blood group 'AB' is the universal donor as it does not contain any antibodies.

Q. Blood group 'AB' is the universal recipient as it contains both the antigens 'A' and 'B'.

R. Blood group 'O' is the universal recipient as it does not contain any antigens.

1. Only R
2. Only P and R
3. Only P and Q
4. Only Q and R

Geetika's mother has certain ailments of the heart. She is often very stressed and has anxiety. Sometimes, she experiences her heart beating too hard or too fast and occasionally even skipping a beat. Which of the following heart-related conditions explains her problem ?

1. Hypertension
2. Heart attack
3. Palpitations
4. Cardiac arrest

Assertion (A): Blood is the fluid medium of the human circulatory system, responsible for transporting nutrients and excretory wastes, but it does not carry oxygen or carbon dioxide gases.

Reason (R): Oxygen and carbon dioxide gases are transported through the lymph vessels from one part of the body to the other since they are in gaseous states.

1. Both A and R are true.
2. Both A and R are false.
3. A is true and R is false.
4. A is false and R is true.

Assertion (A): None of the arteries carry deoxygenated blood in the human body.

Reason (R): Pulmonary artery carries deoxygenated blood from the right ventricle of the heart to the lungs.

1. Both A and R are true.
2. Both A and R are false.
3. A is true and R is false.
4. A is false and R is true.