The first case of severe air pollution in modern times was
A. In the Meuse valley of Belgium
B. A killing smog in Donara, Pennsylvania along the Monongahela river
C. "Episode 104" which blanketed all or part of 22 states east of the Mississippi
D. The deadlier smog in London in which 4,000 to 5,000 people died from respiratory failure
Answer: Option A
This Question Belongs to Biology GK Chapter Wise >> Plant Anatomy And Physiology
A. Cinnamomum - Amoora association
B. Bischofia - Dillenia association
C. Shorea - Lagerstroemia association
D. Mesua - Michelia association
Which of the following react with haemoglobin, forming methemoglobin which will not take up oxygen?
A. Nitrates
B. Nitrites
C. Carbides
D. Oxides
Internally, hydathode shows a group of loosely arranged parenchymatous cells called as
A. Epiderm
B. Epithelium
C. Ampithecium
D. Epithem
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