Transpiration in plants requires all of the following except: A. Adhesion of wat

Question

Transpiration in plants requires all of the following except: A. Adhesion of water molecules to cellulose. B. Cohesion between water molecules. C. Evaporation of water molecules. D. Active transport through xylem vessels. E. Transport through tracheld. Why is gas exchange more difficult for aquatic animals with gills than for terrestrial animals with lungs? A. Water is denser tan air. B. Water contains much less O_2 than air per unit volume. C. Gills have less surface area than lungs. D. Only A and B are correct E. A, B, and C are correct. Which of the following is NOT a function of plasma proteins in humans? A. Maintenance of blood osmotic pressure. B. Transporting of water-insoluble lipids. C. Blood clotting D. Immune responses. E. Oxygen transport. Air flows in only one direction through the lungs of which animals? A. Frogs. B. Birds. C. Mammals. D. Crocodiles. E. Flying insects. The Bohr shift on the oxygen-hemoglobin dissociation curve is produced by changes in. A. The partial pressure of oxygen. B. The partial pressure of carbon monoxide. C. Hemoglobin concentration. D. Temperature. E. pH.

Explanation / Answer

25. The right answer is option D.

Transpiration is defined as the evaporation or loss of water from the surface of leaves in plants. Transpiration involves the adhesion of water molecules to cellulose( which is an integral component of the plant cell wall).

The movement of water from the roots into the xylem is carried out without the use of energy in the form of ATP. Adhesion and cohesion forces facilitates the movement of water molecules from xylem to mesophyll cells eventually out of the plants through stomata opening. Hence transpiration is a passive transport unlike active transport which requires energy.

So option D is the right answer as active transport is not involved in transpiration.

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