Diffusion (विसरण) is insufficient for multicellular organisms (बहुकोशिकीय जीवों) like humans because it is too slow and inefficient for transporting oxygen over long distances within the body. In multicellular organisms, cells are located far from the surface where oxygen enters the body. To meet the oxygen demands of all cells, a specialized circulatory system with blood vessels and a pump (the heart) is necessary to quickly and efficiently deliver oxygen to every cell.
MCQs Based on the above question
MCQ 1: Why is diffusion insufficient for meeting the oxygen requirements of multicellular organisms like humans?
A. Because it is too slow and inefficient for transporting oxygen over long distances within the body.
B. Because it only works in the presence of light.
C. Because it requires high temperatures to function.
D. Because it can only transport carbon dioxide, not oxygen.
Correct Answer: A
MCQ 2: In multicellular organisms like humans, why can’t diffusion alone meet the oxygen demands of all cells?
A. Cells are too close to each other for diffusion to be effective.
B. Cells are located far from the surface where oxygen enters the body.
C. Diffusion only occurs in water, not in air.
D. Diffusion is blocked by the skin.
Correct Answer: B
MCQ 3: What system do multicellular organisms like humans use to efficiently deliver oxygen to every cell?
A. Respiratory system
B. Digestive system
C. Circulatory system
D. Nervous system
Correct Answer: C
MCQ 4:
What components are essential in the circulatory system for efficient oxygen delivery in humans?
A. Lungs and trachea
B. Blood vessels and the heart
C. Stomach and intestines
D. Bones and muscles
Correct Answer: B