Discover Biology (Sixth Core Edition)
Discover Biology (Sixth Core Edition)
6th Edition
ISBN: 9780393936735
Author: Anu Singh-Cundy, Gary Shin
Publisher: W. W. Norton & Company
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Chapter 25, Problem 1SQ
Summary Introduction

Concept introduction: Global warming, climate change, and global change refer to the climatic change over the globe. Global warming is a significant increase in the average surface temperature of the Earth over various decades. Climate change refers to the alternation in the climate change of the Earth for long-term.

Expert Solution & Answer
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Answer to Problem 1SQ

Correct answer: Increased CO2 concentration in the atmosphere is most directly responsible for global warming. Hence, option a. is the correct answer.

Explanation of Solution

Reasons for the correct statement:

Option a. is given as, “Increased CO2 concentration in the atmosphere”. The carbon percentage in the Earth’s surface is 0.04 percent. CO2 is the important element for photosynthesis in plants and it is the essential element of global climate change. Due to an increase in the CO2 concentration the temperature of the earth increases. This leads to the global warming. Hence, option a. is the correct answer.

Reasons for the incorrect statement:

Option b. is given as “sunspot activity”. The sunspot activity occurs due to the ultraviolet explosion of sunlight towards the skin. Hence, option b. is incorrect.

Option c. is given as “climate change”. Climate change refers to the alternation in the climate that changes earth for a long-term. Hence, option c. is incorrect.

Option d. is given as “biomagnification”. Biomagnification refers to the increasing concentration of the substrate like toxic materials in a higher level of the food chain. Hence, option d. is incorrect.

Hence, option b., c., and d. are incorrect.

Conclusion
Increased CO2 concentration in the atmosphere is the main reason for global warming.

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