11 public questions tagged with this topic.
Vasopressin (ADH) promotes water reabsorption in the kidneys, reducing urine output.
Ref: NCERT Class 11 Biology Chapter 19: Chemical Coordination and Integration Mechanism of Hormone Action - Second Messengers
Aldosterone, a mineralocorticoid, helps in regulating electrolyte and water balance by increasing sodium reabsorption.
Ref: NCERT Class 11 Biology Chapter 19: Chemical Coordination and Integration Adrenal Gland - Cortex and Medulla
ADH (Vasopressin), secreted by the posterior pituitary, promotes water reabsorption in the kidneys to regulate water balance.
Ref: NCERT Class 11 Biology Chapter 19: Chemical Coordination and Integration Endocrine System and Hypothalamus Pituitary Axis
Diabetes insipidus occurs due to a deficiency of ADH, leading to excessive urine output and dehydration.
Ref: NCERT Class 11 Biology Chapter 16: Excretory Products and their Elimination Micturition Disorders and Accessory Excretory Organs
ADH increases the permeability of the collecting ducts to water, allowing more water reabsorption.
Ref: NCERT Class 11 Biology Chapter 16: Excretory Products and their Elimination Urine Formation - Reabsorption and Secretion
The distal convoluted tubule (DCT) regulates salt and water balance under the influence of aldosterone and ADH.
Ref: NCERT Class 11 Biology Chapter 16: Excretory Products and their Elimination Nephron Structure - Glomerulus and Bowmans Capsule
Aldosterone increases sodium reabsorption in the kidney while promoting potassium excretion.
Ref: NCERT Class 11 Biology Chapter 16: Excretory Products and their Elimination Human Excretory System - Kidney and Ureters
The excretory system in frogs, consisting of kidneys, ureters, cloaca, and urinary bladder, maintains water balance and excretes nitrogenous wastes.
Ref: NCERT Class 11 Biology Chapter 7: Structural Organisation in Animals Frog - Anatomy - Circulatory and Excretory System
Frogs are ureotelic animals that excrete urea as their primary nitrogenous waste to maintain water balance.
Ref: NCERT Class 11 Biology Chapter 7: Structural Organisation in Animals Animal Tissues - Muscular and Neural Tissue
Aldosterone is the scientifically accurate answer to this question. Within the study of Lipids without annotations, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of Aldosterone directly address what is being asked. Among the other options, Estrogen, Testosterone, and Cortisol do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 10
Correct option is D, 99%. In Excretory System, the accurate description is 99%, and that is what you should commit to memory. Keep the definition tight and the role clear — 99% is the option that correctly names the structure, process, or principle asked for in Excretory System. Then 99% is the answer you can defend. Check yourself by covering the options and writing the answer first, then matching the letter — that builds confidence. If the wording feels dense, translate it into everyday language first, then map that plain sentence back onto 99%. Remember that physiology questions reward precise language: name the process, the location, and the outcome, then match that to the option text.
Ref: Animal physiology is Unit 7 of the CSIR NET Life Science Syllabus, covering core body systems. It accounts for roughly 10% of the total marks in Sections B and C.
