Question 411 markMCQSection B

Following are the steps involved in the experiment of determining the percentage of water absorbed by raisins which are not in proper sequence: a. Weigh soaked raisins, b. Weigh dry raisins, c. Soak the raisins in water for 2 hours, d. Wipe out soaked raisins gently. The correct sequence of these steps is

Life Processes
Osmosis and Water Absorption in Plants

Options

(A)b, a, c, d
(B)b, c, a, d
(C)b, a, d, c
(D)b, c, d, a

Official answer

D

Answer keywords:sequence of stepsdry raisinssoakingwipingsoaked raisins

Marking scheme

  1. 1.1 mark for identifying the correct sequence of steps (b, c, d, a) and selecting Option D.

Hint

Think about the chronological order: you must weigh the dry raisins first, then soak them, then dry their surface, and finally weigh them again.

Quick oral answer

The correct sequence is: first weigh the dry raisins, soak them in water, gently wipe off excess surface water with filter paper, and finally weigh the soaked raisins.

Common mistakes

  1. 1.Weighing the soaked raisins before wiping them dry.
  2. 2.Confusing the order of dry weighing and wet weighing.

Analysis and explanation

The correct logical sequence of steps to determine the percentage of water absorbed by raisins is:

  1. Weigh dry raisins (b): This gives the initial mass (W1W_1).
  2. Soak the raisins in water for 2 hours (c): This allows endosmosis to occur.
  3. Wipe out soaked raisins gently (d): This removes surface water to ensure accurate final weighing.
  4. Weigh soaked raisins (a): This gives the final mass (W2W_2).

Thus, the correct sequence is b, c, d, a, which corresponds to Option D.


  • Option A, B, and C are incorrect because they place the weighing of soaked raisins (a) before the soaking process (c) or before wiping them dry (d), which is physically impossible or scientifically incorrect.

Interesting facts

This experiment demonstrates endosmosis, which is the same physical process by which plant roots absorb water from the soil as mentioned in the NCERT text.

Question details

Q41 of 41 questions

Board
CBSE
Class
Class 10
Subject
Science
Year
2012
Section
Section B
Marks
1
Type
MCQ
Chapter
Life Processes
Topic
Osmosis and Water Absorption in Plants
Bloom's level
Applying
Syllabus topic
Osmosis and transport of water

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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.