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Blood is a red, viscous connective tissue flowing within blood vessels. Which of the following statements are TRUE?

(A) The average volume in a healthy adult male and female is about 5 and 4.5 liters respectively.

(B) The plasma contains 70% water, 20% proteins, nutrients, salts, and hormones.

(C) The hemoglobin binds oxygen in the lungs to transport it throughout the body.

(D) The red blood corpuscles act as the body's defense mechanism against infections.

Choose the correct answer from the options given below:

Solution

✅ Correct Option: 3

Option 1: (A), (B) and (D) only -> Statement (B) is incorrect as plasma contains ~90-92% water, not 70%. Statement (D) is incorrect as WBCs, not RBCs, provide defense against infections.

Option 2: (A), (B) and (C) only -> Statement (B) is incorrect about plasma composition (should be ~90-92% water, not 70%).

Option 3: (A), (C) and (D) only -> Statement (A) correctly states blood volume. Statement (C) correctly describes hemoglobin's oxygen-binding function. However, statement (D) is scientifically incorrect as RBCs transport oxygen, while WBCs provide immune defense.

Option 4: (B), (C) and (D) only -> Excludes statement (A) which is correct. Includes statements (B) and (D) which are incorrect.


Look, we know (D) is wrong because basic biology exists, but NTA's answer key had other plans. Another NTA masterpiece - don't blame us, we're just messengers of their creative grading!

However, following the given answer: Option 3: (A), (C) and (D) only

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