Blood Composition & Grouping Systems — NEET Biology
📚 Practice ConceptBlood is a connective tissue consisting of plasma (matrix) and the formed elements; erythrocytes, white blood cells (WBCs, leucocytes) and platelets (thrombocytes) constitute the formed elements. Blood of humans are grouped into A, B, AB and O systems based on the presence or absence of two surface antigens. A, B on the RBCs. Another blood grouping is also done based on the presence or absence of another antigen called Rhesus factor on the RBCs. Blood from Rh+ve persons can be given to Rh+ve persons. Plasma is derived from blood called tissue fluid. This fluid called lymph is almost similar to blood except for the formed element and the formed elements.
Which of the following statements are NOT correct regarding the roles of lymph and the lymphatic system? S1: Lymph, being derived from interstitial fluid, contains a higher concentration of plasma proteins compared to blood plasma. S2: The lymphatic system's primary role includes returning the unabsorbed interstitial fluid to the circulatory system and absorbing dietary fats. S3: Lymphocytes present in lymph nodes are crucial for initiating immune responses against pathogens filtered from the lymph. S4: The exchange of nutrients, gases, and waste products between blood and tissue cells directly occurs through lymph. S5: Lymphatic capillaries, known as lacteals, are primarily involved in the absorption of water-soluble vitamins from the digestive tract.
View solution & NCERT explanation
Correct answer: A — S1, S4 and S5 are not correct.
The question focuses on identifying incorrect statements about the roles and composition of lymph based on NCERT. S1: Incorrect. Lymph has 'fewer proteins' than plasma, as stated in the NCERT summary: "This fluid called lymph is almost similar to blood except for the protein content." S2: Correct. NCERT states that the lymphatic system "collects this fluid and drains it back to the major veins" and "Fats are absorbed through lymph in the lacteals present in the intestinal villi." S3: Correct. NCERT states, "Lymph is a colourless fluid containing specialised lymphocytes which are responsible for the immune responses of the body." Lymph nodes are the sites where this immune response is initiated. S4: Incorrect. The exchange of substances between blood and tissue cells occurs through the 'interstitial fluid' (or tissue fluid), not directly through lymph. Lymph is the interstitial fluid collected by the lymphatic system. S5: Incorrect. Lacteals are specifically mentioned for the absorption of 'fats' from the intestine, not water-soluble vitamins. Therefore, statements S1, S4, and S5 are not correct.
What does NCERT say about Blood connective tissue consisting?
Has this concept appeared in NEET?
Which chapter is this from?
Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.