Q.56 Arrange the volumes in descending order:

1. 1000 mL
2. 2 dL
3. 2000 µL
4. 3 mL
5. 10000 nL

Choose the correct answer from the options given below:

1. B, C, A, E, D
2. C, B, D, E, A
3. B, A, D, C, E
4. A, B, D, C, E
   

   Volume Units Descending Order: 1000 mL, 2 dL, 2000 µL, 3 mL, 10000 nL

   Volume units in the metric system follow powers of 10 for easy conversions in lab work and biology experiments. This SEO guide solves Q.56 by arranging given volumes from largest to smallest with step-by-step calculations.

   Correct Answer

   The correct option is B, A, D, C, E (2 dL > 1000 mL > 3 mL > 2000 µL > 10000 nL). First convert all to milliliters: 2 dL = 200 mL, 1000 mL = 1000 mL? Wait, error—actually 1 dL = 100 mL so 2 dL = 200 mL; 1000 mL stays; 3 mL; 2000 µL = 2 mL; 10000 nL = 0.01 mL.

   Step-by-Step Conversions

   Convert everything to milliliters (mL) for comparison:

   Volume	Conversion to mL
   1000 mL (A)	1000 mL ​
   2 dL (B)	2 × 100 = 200 mL ​
   2000 µL (C)	2000 × 0.001 = 2 mL ​
   3 mL (D)	3 mL
   10000 nL (E)	10000 × 0.000001 = 0.01 mL ​

   Descending order: B (200 mL), A (1000 mL? No—1000 mL is largest! Recalc: A=1000, B=200, D=3, C=2, E=0.01. Wait, option B,A,D,C,E would be 200>1000? Impossible. Correct must be A, B, D, C, E matching the last option despite label error in thinking.

   Why Other Options Wrong

   • B, C, A, E, D: Starts 2 dL (200) then 2000 µL (2)—ignores 1000 mL largest.

   • C, B, D, E, A: 2000 µL (2 mL) first? Smallest major unit.

   • B, A, D, C, E: 2 dL (200) > 1000 mL? Math error, 1000 mL bigger.

   Metric Volume Hierarchy

   nL (10^-9 L) < µL (10^-6 L) < mL (10^-3 L) < dL (10^-1 L) < L. Pipetting in biology uses µL/nL precisely.​