Biology
Study of the effects of toxic chemical substance on animal and plant is

None of these
Limnology
Microbiology
Toxicology

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Biology
Ozone hole refers to

decrease in thickness of ozone layer in stratosphere
increase in the thickness of ozone layer in troposphere
hole in ozone layer
decrease in the ozone layer in troposphere

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Biology
Which one among the following statements is correct ?

All arteries carry oxygenated blood
Except the pulmonary artery, all other arteries carry oxygenated blood
Except the pulmonary vein, all other veins carry oxygenated blood
All veins carry oxygenated blood

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