biology : class11 Analogous Structures : Importance of Classification, Basis of Classification, Advantages of Classification : Need for Classification MCQ Questions and Answers
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Analogous Structures
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MCQ Questions
1. Which combination correctly identifies analogous structures and the evolutionary process responsible for their occurrence?
A.
Forelimbs of humans and wings of bats; divergent evolution
B.
Wings of birds and wings of butterflies; convergent evolution
C.
Thorns of Bougainvillea and tendrils of Cucurbita; divergent evolution
D.
Flippers of whales and forelimbs of horses; convergent evolution
Correct Answer:
Wings of birds and wings of butterflies; convergent evolution
Explanation:
Bird wings and butterfly wings perform the same function of flight but arise from fundamentally different structural origins. Such similarities produced independently are analogous and result from convergent evolution.
2. A biologist observes that the wings of a bird and the wings of an insect perform the same function but differ greatly in internal organization and embryonic origin. What is the strongest conclusion?
A.
They are homologous because both are used for locomotion
B.
They are analogous because similar functions evolved independently
C.
They are vestigial because their structures are unrelated
D.
They are identical because both generate lift
Correct Answer:
They are analogous because similar functions evolved independently
Explanation:
Analogous structures have similar functions but different structural and developmental origins. Bird and insect wings independently evolved as adaptations for flight.
3. Which observation would provide the most reliable evidence that two structures are analogous rather than homologous?
A.
They occur in organisms belonging to the same genus
B.
They perform identical functions in different organisms
C.
They have different developmental origins despite comparable functions
D.
They contain similar tissues at maturity
Correct Answer:
They have different developmental origins despite comparable functions
Explanation:
The defining distinction is that analogous structures share function but not evolutionary or developmental origin. Different developmental origins strongly support analogy.
4. The streamlined body of a shark and the streamlined body of a dolphin are often cited as an example of analogy because they primarily illustrate:
A.
Independent evolution of similar adaptations in unrelated lineages
B.
Inheritance of the same skeletal plan from a common ancestor
C.
Reduction of structures that have lost their original function
D.
Modification of one ancestral structure within a single lineage
Correct Answer:
Independent evolution of similar adaptations in unrelated lineages
Explanation:
Sharks and dolphins evolved streamlined body forms independently in response to similar aquatic conditions. Similar function and appearance without common structural origin indicate analogy.
5. Why can the presence of analogous structures lead to an incorrect conclusion about evolutionary relationships if used alone?
A.
Analogy reflects common ancestry more accurately than DNA evidence
B.
Analogy results from similar selection pressures, not necessarily close ancestry
C.
Analogous structures occur only in organisms with identical genomes
D.
Analogous structures always retain unused ancestral functions
Correct Answer:
Analogy results from similar selection pressures, not necessarily close ancestry
Explanation:
Analogous structures arise through convergent evolution under similar environmental pressures. Therefore, they may make distantly related organisms appear similar without indicating close common ancestry.
6. Which pair best demonstrates analogous structures based on similarity of function but difference in basic structural plan?
A.
Wings of a bat and forelimbs of a human
B.
Flippers of a seal and forelimbs of a cat
C.
Tendrils of a pea plant and tendrils of a grapevine
D.
Wings of a butterfly and flippers of a whale
Correct Answer:
Wings of a butterfly and flippers of a whale
Explanation:
Both structures aid movement, but butterfly wings and whale flippers have entirely different structural origins and developmental plans. Their functional similarity is therefore analogous.
7. A classification based heavily on analogous characters would most likely group organisms according to:
A.
Their recent common ancestry
B.
Their similar adaptations or ecological roles
C.
Their identical embryological development
D.
Their shared ancestral skeletal pattern
Correct Answer:
Their similar adaptations or ecological roles
Explanation:
Analogous characters arise when unrelated organisms adapt to similar environmental demands. Classification relying on them may group organisms by function or ecological role rather than true evolutionary relationship.
8. Which comparison correctly distinguishes the evidence provided by homologous and analogous structures?
A.
Homologous structures suggest common ancestry, whereas analogous structures suggest similar selective pressures
B.
Homologous structures always have identical functions, whereas analogous structures never have similar functions
C.
Homologous structures arise independently, whereas analogous structures are inherited unchanged
D.
Both types provide equally strong evidence of close evolutionary relationship
Correct Answer:
Homologous structures suggest common ancestry, whereas analogous structures suggest similar selective pressures
Explanation:
Homologous structures share an underlying origin and support common ancestry. Analogous structures independently acquire similar functions, usually because organisms face comparable selective pressures.
9. The similarity between the digging forelimb of a mole and the digging forelimb of a mole cricket is best interpreted as analogy when:
A.
Both structures contain exactly the same bones
B.
Both organisms inherited the structures from the same recent ancestor
C.
Their digging adaptations evolved independently in response to similar environmental demands
D.
Their embryonic structures develop from identical tissues
Correct Answer:
Their digging adaptations evolved independently in response to similar environmental demands
Explanation:
If the mole and mole cricket independently evolved digging appendages in response to similar subterranean conditions, the structures are analogous because their function is similar but their origins differ.
10. Which statement about analogous structures is most accurate in the context of biological classification?
A.
They are the most dependable characters for establishing phylogenetic relationships
B.
They reveal evolutionary convergence and should not alone be used to infer close relationship
C.
They prove that organisms possessing them share the same immediate ancestor
D.
They are always reduced structures with little or no present function
Correct Answer:
They reveal evolutionary convergence and should not alone be used to infer close relationship
Explanation:
Analogous structures demonstrate convergent evolution: unrelated organisms independently develop similar functional traits. Consequently, they are useful for recognizing adaptation but unreliable as sole evidence of close common ancestry.
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