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How do you distinguish between humification and mineralisation?

How do you distinguish between humificat | Class 12 Biology Chapter Ecosystem, Ecosystem NCERT Solutions

Welcome to the NCERT Solutions for Class 12 Biology - Chapter Ecosystem. This page offers a step-by-step solution to the specific question from Exercise 0, Question 14: . With detailed answers and explanations for each chapter, students can strengthen their understanding and prepare confidently for exams. Ideal for CBSE and other board students, this resource will simplify your study experience.

Question 14:

How do you distinguish between humification and mineralisation?

Answer:

The formation of soil occurs in two stages: Weathering, Humification and Mineralization. Humification process leads to accumulation of Humus. Humus is an amorphous and a colloidal mixture of complex organic substances which is made up of humic and non- humic substances.

Humification:

Addition of humus means the remains finally divided amorphous, incomplete decomposed black coloured organic matter to the mineral matter of the soil.
When the living organism gets decomposed after their death in the soil, then this decomposed product is mixed with the soil. By this decomposition process, it releases various types of organic and inorganic nutrients, which then mixed into the mineral particles of the soil that converts it into the dark colour.
And this contains various important categories: litter, Duff and leaf mould etc.
Humus is highly resistant to microbial actions and decomposition process occurs at very slow rate.
It is a reservoir of nutrients

Mineralization:

The release of organically bound nutrients which changes into the inorganic form available to plants and microbes by the further degradation of humus by the microbes and then this release of inorganic nutrients occurs by this process called mineralization.
This mineralization process occurs faster mainly in the tropical areas in comparison to temperate zone areas.

On the basis of organic content, soil are classified into various categories like Mors, Peat, Muck, Moder soil etc.

Other Questions of Chapter Ecosystem

Flow of energy through various trophic levels in an ecosystem is unidirectional and non-cyclic. Explain.

The number of trophic levels in an ecosystem are limited. Comment.

Q: What is primary productivity? Give brief description of factors that affect primary productivity.

Q: Write important features of a sedimentary cycle in an ecosystem.

Is an aquarium a complete ecosystem?

Q: What is the percentage of photosynthetically active radiation (PAR), in the incident solar radiation.
(a) 100%
(b) 50 %
(c) 1-5%
(d) 2-10%

Sometimes due to biotic/abiotic factor the climax remain in a particular seral stage (pre climax) without reaching climax. Do you agree with this statement. If yes give a suitable example.

Among bryophytes, lichens and fern which one is a pioneer species in a xeric succession?

The biodiversity increases when one moves from the pioneer to the climax stage. What could be the explanation?

Q: Give an account of energy flow in an ecosystem.

Popular questions of class 12 Biology

Q: What is spermatogenesis? Briefly describe the process of spermatogenesis.

Q: Why is reproduction essential for organisms? Answer

Q: Write a short note on
(a) Adaptations of desert plants and animals
(b) Adaptations of plants to water scarcity
(c) Behavioural adaptations in animals
(d) Importance of light to plants
(e) Effect of temperature or water scarcity and the adaptations of animals.

Q: With a neat diagram explain the 7-celled, 8-nucleate nature of the female gametophyte.

Q: What is DNA fingerprinting? Mention its application.

Q: What is oogenesis? Give a brief account of oogenesis.

Q: Describe the structure of a seminiferous tubule.

Q: What is triple fusion? Where and how does it take place? Name the nuclei involved in triple fusion.

Q: With a neat, labelled diagram, describe the parts of a typical angiosperm ovule.

Q: Explain the Law of Dominance using a monohybrid cross.

Recently Viewed Questions of Class 12 Biology

Taking examples under each category, discuss upstream and downstream processing.

Name the first transgenic cow. Which gene was introduced in this cow?

Q: Diagrammatically represent the experimental steps in cloning and expressing an human gene (say the gene for growth hormone) into a bacterium like E. coli ?

Q: Explain what is meant by biofortification.

What is the main idea behind “Joint Forest Management Concept” introduced by the Government of India?

Q: List two essential roles of ribosome during translation.

Q: If a population growing exponentially double in size in 3 years, what is the intrinsic rate of increase (r) of the population?

Q: Try to trace the various components of human evolution (hint: brain size and function, skeletal structure, dietary preference, etc.)

Which type of food would have lactic acid bacteria. Discuss their useful application.

Give the full form of ELISA. Which disease can be detected using it? Discuss the principle underlying the test.

Study Tips for Answering NCERT Questions:

NCERT questions are designed to test your understanding of the concepts and theories discussed in the chapter. Here are some tips to help you answer NCERT questions effectively:

Read the question carefully and focus on the core concept being asked.
Reference examples and data from the chapter when answering questions about Ecosystem.
Review previous year question papers to get an idea of how such questions may be framed in exams.
Practice answering questions within the time limit to improve your speed and accuracy.
Discuss your answers with your teachers or peers to get feedback and improve your understanding.

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