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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

An indoor gardener leaving for vacation completely wraps a potted plant with clear plastic. Temperature and light are left at low intensities. The effect of this strategy is to:

a. halt photosynthesis.

b. reduce transpiration.

c. cause guard cells to shrink and stomata to open.

d. destroy cohesion of water molecules in the xylem.

e. increase evaporation from leaf mesophyll cells.

Summary Introduction

Introduction:

Transpiration is the process by which water evaporates from the parts of a plant that are above the ground level. Only 2–5% water is used for photosynthesis and other metabolic processes; the rest is evaporated via transpiration. It is very important for plants to replenish the water lost due to transpiration.

Explanation

Explanation/justification for the correct answer:

Option (b) states that wrapping a plant with plastic reduces transpiration. Transpiration is the process of the evaporation of water and is mainly affected by humidity, temperature, wind movement, carbon dioxide concentration, and light intensity. Wrapping the plant with plastic helps in preventing the evaporation of water as the surface is not exposed.

The gardener keeps the potted plant in the area of low temperature, as high temperature increases the rate of transpiration. Low intensity of light ensures that carbon dioxide demand is less, resulting in aerobic respiration and thus carbon dioxide accumulation in the guard cells and the closing of stomata, and therefore, water loss is reduced. Hence, option (b) is correct.

The explanation for the incorrect answer:

Option (a) states that wrapping a plant with plastic halts photosynthesis. Plants are wrapped with plastic to prevent dehydration. This measure does not stop the plant from photosynthesis...

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