“Two areas of study namely ‘evolution’ and ‘classification’ are interlinked”. Justify this statement.
“Two areas of study namely ‘evolution’ and ‘classification’ are interlinked”. Justify this statement.
The two areas of study, "evolution" and "classification", are deeply interlinked and mutually support each other. This can be justified through the following points:
- Basis of Classification:
- Classification is the systematic grouping of organisms based on their similarities and differences in characteristics (features of form or function).
- Organisms that share a large number of characteristics are grouped together, while those with fewer similarities are placed in different groups.
- Reflection of Common Ancestry:
- The presence of shared characteristics among different species indicates that they have inherited these traits from a common ancestor.
- For example, the presence of a vertebral column in mammals, birds, reptiles, and amphibians indicates they all evolved from a common vertebrate ancestor.
- Tracing Evolutionary Relationships (Phylogeny):
- The more characteristics two species share, the more closely related they are.
- The closer the relationship, the more recently they shared a common ancestor.
- Therefore, as we build a classification hierarchy from species to kingdoms, we are actually tracing the evolutionary relationships and history of life on Earth. Thus, classification is a direct reflection of evolutionary relationships.
Marking Scheme
- 11 Mark: For explaining that classification is based on grouping organisms according to shared characteristics (similarities and differences).
- 21 Mark: For explaining that shared characteristics indicate a common origin/ancestor (more shared traits = closer evolutionary relationship).
- 31 Mark: For concluding that classification is a direct reflection of the evolutionary history (phylogeny) of organisms.
Hint
Think about how we group organisms based on shared characteristics. Why do they share these characteristics? It is because they inherited them from a common ancestor.
Quick Oral Answer
Evolution and classification are interlinked because classification is based on shared characteristics, which are inherited from common ancestors. Therefore, classifying organisms actually helps us trace their evolutionary relationships.
Analysis & Explanation
Classification is not just an arbitrary grouping of organisms; it is a map of evolutionary history (phylogeny). When we group organisms based on shared characteristics, we are grouping them by their shared genetic heritage. The closer two organisms are in a classification scheme, the more recently they diverged from a common ancestor during the course of evolution.
Common Mistakes
- 1Treating classification and evolution as completely separate topics without explaining the link of 'common ancestry'.
- 2Failing to define what 'characteristics' mean in the context of classification.
Interesting Facts
Charles Darwin's theory of evolution provided the scientific explanation for why hierarchical classification (like the one developed by Carl Linnaeus) actually works: because it represents the tree of life!
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Frequently Asked Questions
How many marks does this question carry in CBSE Class 10 Science 2016?
This question carries 3 marks in the CBSE Class 10 Science 2016 examination.
Which chapter does this question come from in Science?
This question is from the chapter "Heredity" in the CBSE Class 10 Science syllabus.
What topic does this question cover in Science?
This question covers the topic "Evolution and Classification" from CBSE Class 10 Science.
Has this question appeared in other CBSE Science papers?
Yes, a similar question appeared in the 2016 CBSE Class 10 Science paper.
What type of question is this in the CBSE Class 10 Science 2016 paper?
This is a Short Answer question from Section A in the CBSE Class 10 Science 2016 paper.