The process by which carbon dioxide is transported in the blood mainly as: MCQ with Answer and Explanation

The process by which carbon dioxide is transported in the blood mainly as:
A. Carbaminohemoglobin
B. Dissolved in plasma
C. Carbon monoxide
D. Bicarbonate ions
Answer: Option D
Solution (By JKSSB Mock Tests)
About 70% of CO₂ is transported as bicarbonate (HCO₃⁻) ions in plasma. CO₂ reacts with water in RBCs, catalyzed by carbonic anhydrase, to form carbonic acid, which dissociates into H⁺ and HCO₃⁻. The rest is bound to hemoglobin or dissolved. Bicarbonate is the major transport form.

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Practice More Biology Questions

Question #1
Consider statements about plant reproduction: 1. The anther produces pollen. 2. The ovary develops into the fruit. 3. Self-pollination increases genetic diversity. Which are correct?
A. 1, 2 and 3
B. 2 and 3 only
C. 1 and 3 only
D. 1 and 2 only

Correct Answer: Option D


Explanation:
The anther is the male reproductive part of the flower where microspores develop into pollen grains. After fertilization, the ovary wall matures and develops into the fruit, enclosing the seeds. Self-pollination involves the transfer of pollen to the stigma of the same flower or plant, resulting in offspring genetically identical to the parent, thus decreasing, not increasing, genetic diversity. Thus, statements 1 and 2 are correct.

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Question #2
The organ that produces bile and detoxifies the blood is the:
A. Pancreas
B. Liver
C. Spleen
D. Gall bladder

Correct Answer: Option B


Explanation:
The liver is the body's largest internal organ, performing metabolism, detoxification, bile production, and protein synthesis. The gall bladder stores bile.

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Question #3
Consider statements about the endoplasmic reticulum: 1. Rough ER has ribosomes attached. 2. Smooth ER synthesizes lipids. 3. Rough ER is involved in detoxification. Which are correct?
A. 1 and 2 only
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Correct Answer: Option A


Explanation:
The rough endoplasmic reticulum (RER) has ribosomes attached to its cytoplasmic surface, making it appear rough, and is primarily involved in protein synthesis and modification. The smooth endoplasmic reticulum (SER) lacks ribosomes and is the major site for lipid synthesis and detoxification of drugs. Statement 3 is incorrect as detoxification is a function of SER.

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