The process of conversion of nitrates to nitrogen gas by bacteria is:
A. Denitrification
B. Ammonification
C. Nitrification
D. Nitrogen fixation
Answer: Option A
Solution (By JKSSB Mock Tests)
Denitrification, carried out by bacteria like Pseudomonas, reduces nitrates to N₂ gas, returning it to the atmosphere. Nitrification converts ammonia to nitrates, ammonification releases ammonia, nitrogen fixation converts N₂ to ammonia.
Explanation:
The kidneys sense low oxygen levels and secrete erythropoietin (EPO), which stimulates red blood cell production in the bone marrow. The liver also produces some EPO in fetal life. Bone marrow is the target, not producer.
Explanation:
The most unique and defining characteristic of Class Aves (birds) is the presence of feathers, which are modified scales used for flight and insulation. Birds are warm-blooded (homeothermic), have a four-chambered heart, and possess a beak instead of jaws. Mammary glands and external pinnae are features of mammals.
Explanation:
Body Mass Index (BMI) is a simple index used to classify underweight, overweight, and obesity. It is calculated as a person's weight in kilograms divided by the square of their height in meters (kg/m2). While it is a useful population-level screening tool, it does not directly measure body fat and may not be accurate for athletes or the elderly.
No comments yet. Be the first to start the discussion!