Q40
1 markMCQSection B

While performing the experiment of determining the percentage of water absorbed by raisins, the extra water left on the surface of soaked raisins is removed before final weighing. The correct procedure for this is

Life Processes
Osmosis and Water Absorption in Plants

Options

(A)keep the soaked raisins under the sun
(B)keep the soaked raisins under fan
(C)wipe off the extra water using dry cotton wool
(D)wipe off the extra water using filter paper
Official Answer

D

filter papersurface waterblottingaccuracy

Marking Scheme

  • 11 mark for selecting Option D.

Hint

Choose a method that removes only the surface water quickly without causing evaporation of the water absorbed inside the raisins.

Quick Oral Answer

We use filter paper to gently blot the surface of the soaked raisins to remove excess surface water without causing evaporation of the water inside.

Analysis & Explanation

To find the accurate mass of the soaked raisins, any extra surface water must be removed. Using a filter paper or blotting paper is the correct procedure because it gently absorbs only the surface water without causing any evaporation or loss of water from inside the cells of the raisins.


  • Option D is correct because filter paper has high porosity and capillary action, allowing it to quickly absorb surface moisture without squeezing or damaging the specimen.
  • Option A and B are incorrect because keeping the raisins under the sun or a fan will cause evaporation of water from within the raisins, leading to inaccurate measurements.
  • Option C is incorrect because cotton wool can leave fibers sticking to the surface of the raisins, which would add extra weight and affect the accuracy of the final reading.

Common Mistakes

  1. 1Drying the raisins under the sun or fan, which causes internal water loss.
  2. 2Using cotton wool which leaves fibers on the raisins.

Interesting Facts

Filter paper has high porosity and capillary action, allowing it to quickly absorb surface moisture without squeezing or damaging the specimen.

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Frequently Asked Questions

How many marks does this question carry in CBSE Class 10 Science 2012?

This question carries 1 mark in the CBSE Class 10 Science 2012 examination.

Which chapter does this question come from in Science?

This question is from the chapter "Life Processes" in the CBSE Class 10 Science syllabus.

What topic does this question cover in Science?

This question covers the topic "Osmosis and Water Absorption in Plants" from CBSE Class 10 Science.

What type of question is this in the CBSE Class 10 Science 2012 paper?

This is a MCQ question from Section B in the CBSE Class 10 Science 2012 paper.