What is meant by biological magnification ?
What is meant by biological magnification ?
Official answer
Biological magnification refers to the process by which the concentration of non-biodegradable harmful chemicals (such as pesticides) increases progressively at each successive trophic level of a food chain.
Marking scheme
- 1.1 mark for defining it as the increase in concentration of chemicals at higher trophic levels.
Hint
Focus on how the amount of toxins changes as you move from plants to herbivores to carnivores.
Quick oral answer
It is the increase in the concentration of harmful, non-biodegradable substances like pesticides as we move up the food chain.
Common mistakes
- 1.Confusing biological magnification with accumulation in a single organism (bioaccumulation).
- 2.Thinking the concentration decreases as it moves up the food chain.
Analysis and explanation
Since these chemicals are not degradable, they get accumulated at each trophic level. As human beings occupy the top level in many food chains, the maximum concentration of these chemicals is often found in our bodies.
Interesting facts
DDT is a famous example of a pesticide that caused biological magnification, leading to the thinning of eggshells in birds of prey like eagles.
Question details
Q3 of 41 questions
- Board
- CBSE
- Class
- Class 10
- Subject
- Science
- Year
- 2011
- Section
- Section A
- Marks
- 1
- Type
- Very Short Answer
- Chapter
- Chemical Reactions and Equations
- Topic
- Our Environment
- Bloom's level
- Understand
- Syllabus topic
- Ecosystem and Food Chains
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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 "Chemical Reactions and Equations" in the CBSE Class 10 Science syllabus.
What topic does this question cover in Science?
This question covers the topic "Our Environment" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2011 paper?
This is a Very Short Answer question from Section A in the CBSE Class 10 Science 2011 paper.