Biology
Normal adult human male has

14 gram of haemoglobin/100 gram of blood
18 gram of haemoglobin/100 gram of blood
24 gram of haemoglobin/100 gram of blood
10 gram of haemoglobin/100 gram of blood

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Biology
The kidneys are stimulated to produce renin

By a decrease in the blood pressure
When the specific gravity of urine rises above 1.10
When the pH of the urine decreases
When the peritubular capillaries are dilated

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Biology
Ozone hole refers to

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

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