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प्रश्न
Human tailbone is a vestigial organ. Explain.
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उत्तर
The vestigial organ is the remains of a structure that was functional in some ancestors but is no longer functional in the organisms.
In humans, many vestigial structures show a relationship to other mammals including the primates. Ancestors of human were having well-developed tailbone as their adaptation was arboreal. But gradually humans got adapted to the terrestrial habitat. So, their human tailbone is reduced (vestigial).
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संबंधित प्रश्न
Give two examples of vestigial organs in human beings and plants.
“Two areas of study namely 'evolution' and 'classification' are interlinked'. Justify this statement.
If you are asked to select a group of two vegetables, out of the following, having homologous structures which one would you select?
(a) Carrot and radish
(b) Potato and sweet potato
(c) Potato and tomato
(d) Lady finger and potato
How analogy and homology considered as an evidence in support of evolution ?
Four students A, B, C and D reported the following set of organs to be homologous. Who is correct ?
(A) Wings of a bat and a butterfly
(B) Wings of a pigeon and a bat
(C) Wings of a pigeon and a butterfly
(D) Forelimbs of cow, a duck and a lizard
Which one of the following pairs of vegetables is an example of homologous structures?
(A) Potato and sweet potato
(B) Carrot and radish
(C) Carrot and tomato
(D) Tomato and radish
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Attempt giving a clear definition of the term species.
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(a) analogous organs
(b) analeptic organs
(c) homologous
(d) homophobic organs
The presence of which of the following types of organs in two organisms indicates that they are derived from the same ancestor?
(a) analogous organs
(b) respiratory organs
(c) digestive organs
(d) homologous organs
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(a) analogous organs
(b) vestigial organs
(c) respiratory organs
(d) homologous organs
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(c) Name one feature in which Z resembled X.
(d) Name one feature in which Z resembled Y.
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Embryology
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Human jaw
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Vertebrates have slowly originated from invertebrates.
Write a short note:
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- What does it prove?
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Industrial melanism in England after 1850 is an excellent example of Natural selection. Explain how?
