The set of materials required in the experiment, "to determine the percentage of water absorbed by raisins" is

Life Processes

Experimental Setup for Water Absorption

Options

(A)Raisins, water, filter paper, beaker

(B)Raisins, beaker, balance, weight box

(C)Raisins, beaker, water, balance, weight box

(D)Raisins, beaker, water, filter paper, weight box, balance

Official Answer

The correct option is D: Raisins, beaker, water, filter paper, weight box, balance.

raisinsbeakerwaterfilter paperbalanceweight box

Marking Scheme

11 Mark for selecting the option containing all necessary apparatus, including the filter paper and weighing balance.

Hint

Identify all the steps of the experiment: weighing dry raisins, soaking them, drying their surface, and weighing them again. What tools do you need for every single step?

Quick Oral Answer

Filter paper is used to gently blot dry the surface of the soaked raisins to remove any adhering surface water, ensuring we only measure the water absorbed inside the raisins.

Analysis & Explanation

To successfully perform the experiment to determine the percentage of water absorbed by raisins, the complete set of required materials includes:

Raisins: The biological sample undergoing endosmosis.
Beaker: To hold the water and soak the raisins.
Water: The medium for absorption.
Filter paper (or blotting paper): Crucial for gently wiping off excess surface water from the soaked raisins before weighing them, ensuring accurate final mass measurement.
Balance and Weight box: To accurately measure the initial dry mass ( $W_1$ ) and the final wet mass ( $W_2$ ).

Option A lacks a balance and weight box, making it impossible to measure the mass and calculate the percentage.
Option B lacks water and filter paper, which are essential for the soaking and drying steps.
Option C lacks filter paper, which is necessary to remove surface water; without it, the final mass reading will be inaccurately high due to external water droplets.

Common Mistakes

1Forgetting the role of filter paper, which is critical to remove surface water before weighing.
2Choosing incomplete sets of apparatus.

Interesting Facts

If excess surface water is not removed using filter paper, the calculated percentage of water absorbed will be artificially high, leading to experimental error.

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Frequently Asked Questions

How many marks does this question carry in CBSE Class 10 Science 2011?

This question carries 1 mark in the CBSE Class 10 Science 2011 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 "Experimental Setup for Water Absorption" from CBSE Class 10 Science.

What type of question is this in the CBSE Class 10 Science 2011 paper?

This is a MCQ question from Section B in the CBSE Class 10 Science 2011 paper.