Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332



Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem

Water evaporation from plant parts is called ______.

  1. a. translocation
  2. b. respiration
  3. c. transpiration
  4. d. tension

Summary Introduction

Introduction: Transpiration is a process by which the water molecules escape from the leaves. Excess water stored in the cells is allowed to escape through the stomata in the leaves. Transpiration pull is essential for plants for maintaining the rigidity of plants through the regulation of turgor pressure, absorption of water from the roots, and the transport of water and minerals to all parts of plants.


Reason for the correct answer: Plants get water from the soil. Water is absorbed by the roots from the soil. From the root, the water reaches the leaves through transpiration. The movement of water from the roots to its leaves can be explained using cohesion- tension theory of water transport. The water movement from the roots to the vascular tube (xylem) is facilitated by osmosis. From the xylem, the molecules reach the leaves by adhering to one another and are pulled upward using the force called tension or transpiration pull. This force is applied by the water molecule that escapes out of the stomata (transpiration).

Option c. is given as, “transpiration”. Transpiration helps in the transport of water molecules from the xylem to leaves. When the water volume is abundant in the cell, the plant will increase its transpiration rate. This is how it maintains the water level when the excess water is absorbed.

Hence, the correct answer is option c.

Reasons for the incorrect answers:

Option a. is given as “translocation”...

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