BIOLOGY

JAMB 2023 - Question 6

Biology 2023 JAMB Past Questions - Question 6: 28 g soil sample was heated to a constant weight of 24g. When further heated to red hot and cooled, it weighed 18 g. What is the percentage of humus in the soil?

28 g soil sample was heated to a constant weight of 24g. When further heated to red hot and cooled, it weighed 18 g. What is the percentage of humus in the soil?
A:
B:
C:
D:
Examkits App

Examkit's JAMB CBT App

Practice JAMB offline with our Online, PC and Mobile App

  • ✅ 25+ years of past questions (2000 to 2025)
  • ✅ Video solutions and explanation to questions
  • ✅ E-library
  • ✅ Study by topic
  • ✅ And more.

Correct Answer

B

Explanation

To find the percentage of humus in the soil, we need to understand the process described in the question. When the soil sample was initially heated to a constant weight of 24g, it likely lost moisture and other volatile components. Then, when it was further heated to red hot and cooled, it lost additional material, possibly organic matter like humus.Let's break down the steps:

  1. Initial weight of the soil sample = 28g
  2. After heating to a constant weight = 24g
  3. After further heating to red hot and cooling = 18g
The weight loss from step 2 to step 3 represents the loss of additional material, likely organic matter such as humus.Weight loss = Initial weight - Final weight Weight loss = 24g - 18g Weight loss = 6gNow, to find the percentage of humus in the soil, we'll use the formula:Percentage of humus = (Weight loss / Initial weight) * 100%Substitute the values:Percentage of humus = (6g / 28g) * 100% Percentage of humus ≈ 21.43%So, the percentage of humus in the soil is approximately 21.43%.

Frequently Asked Questions

Examkits is a JAMB CBT practice platform that provides over 20 years of past questions, Post UTME questions, and detailed video solutions to help students prepare for their exams.

You can practice JAMB past questions online, on Android, or on a desktop using the Examkits app. Just register on our website and choose your preferred device.

Yes. Our Android and Windows versions support offline usage. Once downloaded and activated, no internet is required to use most of the features.

Yes, Examkits provides detailed video explanations for all JAMB past questions from 2000 to 2024, helping students understand how to solve each problem.

Examkits offers free practice for some subjects. However, full access requires a one-time affordable activation fee for each version of the app.