The process of removal of metabolic wastes from the body is called:
A. Excretion
B. Digestion
C. Circulation
D. Respiration
Answer: Option A
Solution (By JKExamLibrary)
Excretion is the elimination of nitrogenous waste products (urea, uric acid, ammonia) and other metabolic wastes from the body, primarily by the kidneys. Digestion is breakdown of food, circulation is transport, respiration is gas exchange and energy release. Excretion maintains homeostasis of body fluids and prevents toxic accumulation.
Explanation:
Histology is the microscopic study of tissues—groups of cells with similar structure and function. Cytology deals with cells, anatomy with gross body structures, morphology with form and external features. Histological techniques involve staining and microscopy to examine tissue architecture in health and disease.
Explanation:
The jejunum, with its long villi and microvilli, is the primary site for absorption of digested nutrients. The ileum also absorbs vitamin B₁₂ and bile salts.
Explanation:
Nitrogen fixation is the conversion of inert atmospheric N₂ into ammonia (NH₃) by free-living (e.g., Azotobacter) or symbiotic (e.g., Rhizobium) bacteria, or by industrial processes. Nitrification is the oxidation of ammonia to nitrites then nitrates. Denitrification converts nitrates to N₂ gas. Ammonification is the release of ammonia from organic nitrogen by decomposers. Fixed nitrogen is essential for plant growth.
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