Home
Class 12
BIOLOGY
Read the following statement and choose ...

Read the following statement and choose the correct option
I. Asceding limb of Henle's loop is permeable to water
II. Tubular cells secrete substance like `H^(+), K^(+)` and ammonia into filtrate
III. There is maximum reabsorption in Henle's loop
IV. Conditional reabsorption of `Na^(+)` occurs in DCT
V. PCT helps in maintaining ionic balance of body fluids

A

I, IV and V alone are correct

B

II, III and V alone are correct

C

III, IV and V alone are correct

D

II, IV and V alone are correct

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze each statement regarding the excretory system and determine whether they are true or false. Here’s the step-by-step breakdown: ### Step 1: Analyze Statement I **Statement I:** The ascending limb of Henle's loop is permeable to water. - **Analysis:** The ascending limb of the loop of Henle is actually impermeable to water. It is primarily involved in the reabsorption of sodium and chloride ions. Therefore, this statement is **incorrect**. ### Step 2: Analyze Statement II **Statement II:** Tubular cells secrete substances like H⁺, K⁺, and ammonia into the filtrate. - **Analysis:** This statement is true. During the process of urine formation, tubular cells in the nephron do secrete hydrogen ions (H⁺), potassium ions (K⁺), and ammonia into the filtrate. Hence, this statement is **correct**. ### Step 3: Analyze Statement III **Statement III:** There is maximum reabsorption in Henle's loop. - **Analysis:** This statement is incorrect. The maximum reabsorption of water and solutes occurs in the proximal convoluted tubule (PCT), not in the loop of Henle. Therefore, this statement is **incorrect**. ### Step 4: Analyze Statement IV **Statement IV:** Conditional reabsorption of Na⁺ occurs in DCT. - **Analysis:** This statement is correct. The distal convoluted tubule (DCT) is responsible for the conditional reabsorption of sodium ions (Na⁺) and water, regulated by hormones such as aldosterone. Thus, this statement is **correct**. ### Step 5: Analyze Statement V **Statement V:** PCT helps in maintaining ionic balance of body fluids. - **Analysis:** This statement is also true. The proximal convoluted tubule (PCT) plays a crucial role in maintaining ionic balance by selectively reabsorbing ions and secreting substances like hydrogen ions and ammonia. Therefore, this statement is **correct**. ### Conclusion From the analysis: - Statement I: Incorrect - Statement II: Correct - Statement III: Incorrect - Statement IV: Correct - Statement V: Correct The correct options are Statements II, IV, and V. ### Final Answer The correct option includes statements II, IV, and V. ---
Promotional Banner

Topper's Solved these Questions

  • EXCRETORY PRODUCTS AND THEIR ELIMINATION

    DINESH PUBLICATION ENGLISH|Exercise Check your graps|10 Videos

  • EXCRETORY PRODUCTS AND THEIR ELIMINATION

    DINESH PUBLICATION ENGLISH|Exercise Check your graps|10 Videos

  • EVIDENCES OF EVOLUTION

    DINESH PUBLICATION ENGLISH|Exercise CHECK YOUR GRASP|19 Videos

  • FAMILIES OF FLOWERING PLANTS

    DINESH PUBLICATION ENGLISH|Exercise BRAIN TEASERS -II|97 Videos

Similar Questions

Explore conceptually related problems

Read the following statements and find out the INCORRECT statement . (a) During urine formation, the tubular cells secrete substance like H^+, Na^+ and HCO_3^- into the filtrate. (b) As glomerular filtrate move down in descending limb of Henle it gets concentrated and as concentrated filtrate pass upward in ascending limb of HL it gets diluted. (c) Conditional reabsorption of Na^+ and water takes place in PCT. (d) Reabsorption in ascending limb of HL is minimum.

Read the following statements about the excretory system in humans: I. A fall in GFR can activate the JG cells to release renin. II. ADH can also affect the kidney function by its constrictory effects on blood vessels. III. The proximity between the Henle's loop and vasa recta, as well as the counter-current in them help in maintaining an increasing osmolarity towards the outer medullary interstitium. IV Our lungs remove large amounts of CO_(2) (108 litres/day). V. Renal calculi are the stone or insoluble mass of crystallised salts like oxalates within the kidney. How many of these are correct?

Read the following statements and choose the correct options I. Pelvic fins of female sharks bear claspers. II . In Obelia polyps produce medusae sexually and medusae form the polyps asexually . III . Flame cells in platyheliminthes help in osmoregulation and excretion . IV. In nonchordates , central nervous system is ventral , solid and double . V . Pinnae are present in mammals .

Which of the following statements is/are incorrect regarding the collecting duct? (i). It extends from the cortex to medulla. (ii). Large amount of water could be reabsorbed by it to produce concentrated urine. (iii). Small amount of urea diffuses into it from the medulla to keep up the osmolarity. (iv). it plays a role in maintaining pH and ionic balance of blood by the selective secretion of H^(+) and K^(+) ions.

Read the following statements and choose the correct option I. Failure of segregation of chromatids during cell division results in aneuploidy (II) Chromosomal disorders are mainly determined buy alteration or mutation in a single gene (III) Thalassemia and cystic fibrosis are Mendelian disorders (IV) Sickle cell anemia is an X- linked trait ltbvrgt (V) Haemophilia is an autosome linked recessive disease

Read the following diagram and choose the correct statements. I). In part 'A', the water reabsorption takes place II) In part 'B', the water and electrolytes reabsorption take place III) In part 'C', the water reabsorption takes place IV) In part 'D', the water is reabsorbed but electrolytes are not reabsorbed

Read the following statements and select the correct option (i) Blood cells secrete fibres of structural proteins called collagen and elastin (ii) Neuroglial cells protect and support the nephrons (iii) Osteocytes are present in spaces called lacunae (iv) Striated muscle fibres are bundled together in a parallel fashion (v) Biceps are involuntary and striated.

Study the following statements and choose the correct option. I. Asexual reproduction is common among single celled organisms and organisms with relatively simple organisation II. Conidia, bud, gemmules are common sexual structures III. Runner, rhizome, sucker, tuber, offset, bulb are vegetative propagules IV. The invasive weeds found growing in fresh water bodies is Zostera.

Which of the following statements are correct? (i). Reabsorption of water occurs passively in the initial segment of nephron. (ii). Nitrogenous wastes are absorbed by passive transport. (iii). Conditional reabsorption of Na^(+) and water takes palce in DCT. (iv). DCT reabsorbs HCO_(3)^(-) (v). DCT is capable of selective secretion of H^(+),K^(+) and NH_(3) to maintain pH and Na^(+)-K^(+) balance in blood. (vi). Substance like glucose, amino acids, Na^(+) , etc,. it the filtrate are reabsorbed actively.

Read following statements regarding various steps of urine formation. A. Blood flows through glomerular capillaries under a pressure created due to difference in diameter of afferent and efferent arterioles. B. Filtrate formed after ultrafiltration is isotonic to blood plasma. C. Reabsorption of glucose occurs throughout the tubules of nephron. D. Selective tubular secretion of H^+ and K^+ ions help in maintaining ionic balance of body. Select the option having only correct statements 1) A and C 2) B , C and D 3) A , B and D 4) C and D