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Q7:
Practise drawing various animals and plants.
Solution :
Theoretical Basis: Morphological Adaptation and Evolutionary Divergence
In the context of evolutionary biology, drawing organisms facilitates the understanding of Homologous and Analogous structures. By sketching, we identify evolutionary divergence (common ancestry, different functions) and convergent evolution (different ancestry, similar functions).
Step 1: Visualization of Divergent Evolution (Homology)
The forelimbs of mammals represent a classic example of homologous organs. Despite functional differences (running, swimming, flying), the skeletal architecture remains constant: $Humerus \rightarrow Radius \rightarrow Ulna \rightarrow Carpals \rightarrow Metacarpals \rightarrow Phalanges$.
Step 2: Anatomical Key for Plant Adaptation
To understand evolutionary adaptation in plants, consider the modification of leaves into thorns (protection) and tendrils (support) to conserve energy and increase survival probability in specific biomes [Per the Theory of Natural Selection].
| Organism | Structure | Evolutionary Function |
|---|---|---|
| Bougainvillea | Thorn | Defense against herbivores |
| Cucurbita | Tendril | Mechanical support for climbing |
Step 3: Comparative Analysis Procedures
- Step A: Sketching the Outline: Identify the ancestral skeletal frame (pentadactyl limb structure).
- Step B: Identifying Specialized Features: Add tissue-specific morphology—digit elongation in bats ($d > l$) versus distal shortening in whales.
- Step C: Functional Mapping: Annotate drawings with forces acting upon the structures (e.g., buoyancy for Balaenoptera, gravity for Homo sapiens).
Step 4: Analytical Justification
The transition from a generalized ancestral limb to specialized modern structures is driven by Adaptive Radiation. By drawing these structures, we map the transformation of the limb bones $L_{bone}$ over time $t$, defined by the function:
$Morphology(t) = \int_{ancestor}^{descendant} (Genetic\_Drift + Natural\_Selection) \,dt$
Final Solution: Drawing exercises in biology serve as a systematic method to visualize structural modifications occurring via descent with modification, confirming the divergence of morphological features from a common ancestral plan.
More Questions from Class 12 Biology Evolution EXERCISES
- Q1: Explain antibiotic resistance observed in bacteria in light of Darwinian selection theory.
- Q1: Explain antibiotic resistance observed in bacteria in light of Darwinian selection theory.
- Q2: Find out from newspapers and popular science articles any new fossil discoveries or controversies about evolution.
- Q2: Find out from newspapers and popular science articles any new fossil discoveries or controversies about evolution.
- Q3: Attempt giving a clear definition of the term species.
- Q3: Attempt giving a clear definition of the term species.
- Q4: Try to trace the various components of human evolution (hint: brain size and function, skeletal structure, dietary preference, etc.)
- Q4: Try to trace the various components of human evolution (hint: brain size and function, skeletal structure, dietary preference, etc.)
- Q5: Find out through internet and popular science articles whether animals other than man has self-consciousness.
- Q5: Find out through internet and popular science articles whether animals other than man has self-consciousness.
- Q6: List 10 modern-day animals and using the internet resources link it to a corresponding ancient fossil. Name both.
- Q6: List 10 modern-day animals and using the internet resources link it to a corresponding ancient fossil. Name both.
- Q7: Practise drawing various animals and plants.
- Q8: Describe one example of adaptive radiation.
- Q8: Describe one example of adaptive radiation.
- Q9: Can we call human evolution as adaptive radiation?
- Q9: Can we call human evolution as adaptive radiation?
- Q10: Using various resources such as your school Library or the internet and discussions with your teacher, trace the evolutionary stages of any one animal, say horse.
- Q10: Using various resources such as your school Library or the internet and discussions with your teacher, trace the evolutionary stages of any one animal, say horse.
CBSE Solutions for Class 12 Biology Evolution
Chapters in CBSE - Class 12 Biology
- Reproduction in Organisms
- Human Reproduction
- Reproductive Health
- Principles of Inheritance and Variation
- Molecular Basis of Inheritance
- Human Health and Disease
- Strategies for Enhancement in Food Production
- Microbes in Human Welfare
- Biotechnology: Principles and Processes
- Biotechnology and Its Applications
- Organisms and Populations
- Ecosystem
- Biodiversity and Conservation
- Environmental Issues
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