Diffusion is insufficient for multicellular organisms 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.
What is Diffusion? Diffusion is the movement of molecules from an area of high concentration to an area of low concentration. This plays a vital role in oxygen intake for multicellular organisms
MCQs Based on the above question
Question 1: Why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like humans?
A. Because multicellular organisms have too few cells.
B. Because diffusion is too fast and inefficient over short distances.
C. Because diffusion is too slow and inefficient for transporting oxygen over long distances within the body.
D. Because multicellular organisms do not need oxygen.
Answer: C
Question 2: What is the main reason multicellular organisms need a specialized circulatory system?
A. To decrease the oxygen demands of cells.
B. To quickly and efficiently deliver oxygen to every cell.
C. To reduce the number of cells that need oxygen.
D. To slow down the process of oxygen delivery.
Answer: B.
Question 3: What is diffusion?
A. The movement of molecules from an area of low concentration to an area of high concentration.
B. The movement of molecules from an area of high concentration to an area of low concentration.
C. The process by which blood circulates in the body.
D. The movement of molecules against their concentration gradient.
Answer: B
Question 4: How do multicellular organisms ensure that all their cells get enough oxygen?
A. By relying solely on diffusion.
B. By having fewer cells.
C. By having a specialized circulatory system with blood vessels and a pump (the heart).
D. By reducing their oxygen requirements.
Answer: C.