1 Assertion (A): Diffusion does not meet high energy requirements of multi-cellular organismsReason (R) : Diffusion is a fast process but occurs at the surface of the body.
Question
1 Assertion (A): Diffusion does not meet high energy requirements of multi-cellular organismsReason (R) : Diffusion is a fast process but occurs at the surface of the body.
Solution
The assertion (A) and the reason (R) are both correct, but the reason (R) is not the correct explanation for the assertion (A).
Step 1: Understanding the Assertion (A): Diffusion does not meet high energy requirements of multi-cellular organisms. This is true because diffusion is a passive process that moves molecules from an area of high concentration to an area of low concentration. It is not efficient enough to meet the high energy requirements of multi-cellular organisms, which have many layers of cells and require a more active process of transport.
Step 2: Understanding the Reason (R): Diffusion is a fast process but occurs at the surface of the body. This is also true. Diffusion is a fast process for small distances but it is not efficient for larger distances such as in the bodies of multi-cellular organisms. It occurs at the surface of the body because it is a passive process and can only move molecules across short distances.
Step 3: Connecting Assertion (A) and Reason (R): While both the assertion and the reason are correct, the reason does not correctly explain the assertion. The reason diffusion does not meet the high energy requirements of multi-cellular organisms is not because it occurs at the surface of the body, but because it is a passive process and is not efficient for transporting molecules across the large distances in multi-cellular organisms.
Similar Questions
Diffusion is needed by all forms of life. For example, the Salmonella bacteria below (in pink) are able to sense their environment around them by the diffusion of chemicals across their cell membranes.Complete the sentence below.During diffusion, particles move randomly from where there is a high concentration to areas where there is a __________ concentration of the particle.
Why is diffusion insufficient to meet the oxygen requirements of multi-cellular organisms like humans?
Determine whether this statement is true or false.Diffusion never occurs across a membrane.
Which process could result in the net movement of a substance into a cell, if the substance is more concentrated in the cell than in the surroundings?facilitated diffusiondiffusionosmosisactive transport
What is diffusion?The passive movement of particles from a high concentration to a low concentrationThe passive movement of particles from a low concentration to a high concentrationThe active movement of particles using energy from respirationThe passive movement of water though a semi-permeable membrane from an area of high concentration to an area of low concentration2Which of the following factors do not speed up diffusion?Small surface area to volume ratioIncrease in temperatureIncrease in concentration gradientLarge surface area to volume ratio3During ventilation, in which order does air enter the following structures to reach the lungs?Bronchi, bronchiole, trachea, alveoliTrachea, alveoli, bronchi, bronchioleTrachea, bronchi, bronchiole, alveoliBronchi, trachea, bronchiole, alveoli4Which one of the following characteristics would you expect to find in alveoli to make them efficient at gas exchange?Small surface areaRich supply of blood capillariesLong diffusion distanceThick walls5Which two mechanisms are important for maintaining the steep concentration gradients of oxygen and carbon dioxide that are necessary for gas exchange?Respiration and ventilationVentilation and circulationVentilation and excretionRespiration and circulation6During gas exchange:Oxygen moves down a concentration gradient from the air in the alveoli to the bloodOxygen moves down a concentration gradient from the blood to the air in the alveoliOxygen moves up a concentration gradient from the blood to the air in the alveoliOxygen moves up a concentration gradient from the air in the alveoli to the blood
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