Osmoregulation and Water-Salt Balance Practice Questions
40 free Osmoregulation and Water-Salt Balance practice questions for the NCERT Biology, each with the correct answer and a detailed explanation. Open any question below, or take the full set as an interactive quiz.
Questions
40 questions
All Osmoregulation and Water-Salt Balance questions
- Q1. Which of the following is the most toxic nitrogenous waste requiring large amounts of water for its elimination?
- Q2. The process of maintaining a constant internal osmotic pressure irrespective of the external environment is known as:
- Q3. Protonephridia or flame cells are the primary excretory structures in which of the following organisms?
- Q4. Which segment of the nephron is impermeable to water but allows the transport of electrolytes actively or passively?
- Q5. The GFR (Glomerular Filtration Rate) in a healthy individual is approximately:
- Q6. Which hormone is released by the Atrial walls of the heart in response to an increase in blood pressure?
- Q7. The specialized capillary network that runs parallel to the Loop of Henle is called:
- Q8. In which part of the nephron does maximum reabsorption of water and electrolytes (70-80%) occur?
- Q9. Human kidneys can produce urine nearly _____ times concentrated than the initial filtrate formed.
- Q10. Which of the following is NOT a constituent of sweat produced by sweat glands?
- Q11. The condition of accumulation of urea in blood due to kidney failure is called:
- Q12. What is the function of Antidiuretic Hormone (ADH) / Vasopressin?
- Q13. The Juxtaglomerular Apparatus (JGA) is formed by cellular modifications in which two structures?
- Q14. Which nitrogenous waste is excreted in the form of pellet or paste with a minimum loss of water?
- Q15. The osmolarity of the filtrate increases as it moves down the descending limb of the Loop of Henle because:
- Q16. Renin converts ______ in the blood to ______.
- Q17. Glycosuria and Ketonuria in urine are indicative of which disease?
- Q18. What happens to the GFR when the afferent arteriole diameter increases (vasodilation) relative to the efferent arteriole?
- Q19. Sebaceous glands eliminate certain substances like ______ through sebum.
- Q20. The epithelial cells of Bowman's capsule called podocytes are arranged in an intricate manner to leave some minute spaces called:
- Q21. Which of the following best defines osmoregulation in living organisms?
- Q22. Freshwater fishes constantly gain water by osmosis. How do they primarily maintain osmotic balance?
- Q23. Which structure in the human kidney plays a major role in concentrating urine?
- Q24. Marine fishes tend to lose water to their environment. Which adaptation helps them counter this problem?
- Q25. Which hormone regulates water reabsorption in the distal convoluted tubule and collecting duct?
- Q26. Which nitrogenous waste is excreted by mammals and requires more water for elimination?
- Q27. Ammonotelic animals are typically found in which environment?
- Q28. Which of the following animals is uricotelic?
- Q29. What is the main role of aldosterone in osmoregulation?
- Q30. Which part of the nephron is primarily involved in selective reabsorption?
- Q31. Why are desert mammals able to survive with minimal water intake?
- Q32. Which mechanism helps maintain a high osmotic gradient in the renal medulla?
- Q33. Which ion is actively secreted into the tubular fluid during acid-base balance regulation?
- Q34. What happens to ADH secretion when the body is dehydrated?
- Q35. Which structure carries blood away from the glomerulus?
- Q36. Which of the following correctly matches an animal with its osmoregulatory strategy?
- Q37. Which hormone is secreted by the adrenal cortex and influences electrolyte balance?
- Q38. Why is uric acid considered an advantage for birds and reptiles?
- Q39. Which factor directly increases glomerular filtration rate?
- Q40. Which of the following best describes the role of vasa recta?