NEET Biology: Circulatory System questions with solutions

Q1. Blood passes from left ventricle to right atrium. It is

1. Pulmonary circulation
2. Systemic circulation
3. Coronary circulation
4. Arterovenous circulation

Answer: Pulmonary circulation

Pulmonary circulation is the pathway that carries blood from the heart to the lungs for oxygenation and then returns it to the heart. Blood leaving the left ventricle ultimately reaches the right atrium after passing through the lungs and pulmonary vessels.

Q2. Name the blood cells, whose reduction in number can cause clotting disorder, leading to excessive loss of blood from the body

1. Erythrocytes
2. Leucocytes
3. Neutrophills
4. Thrombocytes

Answer: Thrombocytes

Thrombocytes are platelets, which help blood clot by forming plugs at injury sites and supporting coagulation. If their number drops, clotting is impaired, causing excessive bleeding.