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Ozone prevents the entry of
Options
(a) infrared rays
(b) visible rays
(c) UV rays
(d) X-rays
Correct Answer:
UV rays
Explanation:
Ozone layer or shield is present in stratosphere which is also called ozonosphere. It lies at an altitude of 23-25 km over equator and its concentration is 300 dobsons. It functions as a shield against strong UV radiations. Protection from UV radiations is proportional to thickness of ozone layer. Depletion in the concentration of ozone over a restricted area as spring time decline over Antartica is called ozone hole. Thinning of ozone layer increases the amount of UV-B radiations reaching the earth. It would increase occurence of cataracts, skin cancers, herpes, dimming of eye sight, photoburning, deficient functioning of immune system.
Related Questions: - What do you mean by closed vascular bundle
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Topics: Conservation and Environmental Issues
(111)
Subject: Biology
(4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- What do you mean by closed vascular bundle
- Transfusion tissue can be traced in
- Which one of the following human organs is often called the graveyard of RBC s ?
- Number of cervical vertebrae in human is
- The primary dentition in human differs from permanent dentition in not having one
Topics: Conservation and Environmental Issues (111)
Subject: Biology (4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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