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Chapter 17: Problem 23

The ozone layer in earth's atmosphere is crucial for human survival because it (A) has ions. (B) reflects radio signals. (C) reflects ultraviolet ray. (D) reflects infra red rays.

Short Answer

Expert verified
The ozone layer is crucial for human survival because it \( \underline{(C) \text{ reflects ultraviolet rays}} \). It protects humans, animals, and plants from harmful UV-B radiation.

Step by step solution

01

Eliminate irrelevant options

First, eliminate options that do not explain the importance of the ozone layer. (A) Ions are important in the atmosphere but their presence does not solely explain the importance of the ozone layer for human survival. (B) While the ozone layer does have some effect on radio signals, this is not a crucial factor for human survival.
02

Analyze remaining options

Now consider the remaining options: (C) Reflects ultraviolet rays (D) Reflects infrared rays Ozone is known to absorb certain wavelengths of ultraviolet radiation, specifically UV-B. Excessive UV-B can cause harm to humans, animals, and plants. However, ozone doesn't contribute significantly to the reflection of infrared rays. So we can rule out option (D) as well.
03

Select the correct answer

Based on the analysis above, the correct answer is: (C) Reflects ultraviolet rays The ozone layer in the Earth's atmosphere is crucial for human survival because it reflects ultraviolet rays that can otherwise cause harm to humans, animals, and plants.

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Most popular questions from this chapter

Match List-I (Electromagnetic wave type) with List-II (Its association/application)and select the correct option from the choices given below the lists. [2014] $$ \begin{array}{ll} \text { List-I } & \text { List-II } \\ \hline \text { (P) Infrared wave } & \text { (i) To treat muscular strain } \\\ \text { (Q) Radio waves } & \text { (ii) For broadcasting } \\ \text { (R) X-rays } & \text { (iii) To detect fracture of bones } \\ \text { (S) Ultraviolet } & \text { (iv) Absorbed by the ozone } \\ \text { rays } & \text { layer of the atmosphere } \end{array} $$ $$ \begin{array}{c|c|c|c|c} & \text { P } & \text { Q } & \text { R } & \text { S } \\ \hline \text { A } & \text { (i) } & \text { (ii) } & \text { (iii) } & \text { (iv) } \\ \hline \text { B } & \text { (iv) } & \text { (iii) } & \text { (ii) } & \text { (i) } \\ \hline \text { C } & \text { (i) } & \text { (ii) } & \text { (iv) } & \text { (iii) } \\ \hline \text { D } & \text { (iii) } & \text { (ii) } & \text { (i) } & \text { (iv) } \\ \hline \end{array} $$

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