Phanerogams-Classification [IAS (Admin.) Mains Botany]: Questions 1 - 8 of 8

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Question 1

Appeared in Year: 2016 (IFS)

Describe in Detail Subjective▾

Comment on the characteristics of Archaea, Bacteria and Eukarya.

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Explanation

Characteristics of Archaea

  • Cell wall- Archaea lack peptidoglycan in its cell wall. it is a distinguishable feature between bacteria and archaea.
  • Fatty acid-Archaea has ether bonds connecting fatty acids to molecules of glycerol.
  • RNA polymerase complexity-Archaea has multiple RNA polymerase that also contains multiple polypeptides (some have 8 polypept…

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Question 2

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Explain concept of Progymnosperms.

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Explanation

  • Kingdom - Plantae
  • Clade - Tracheophytes
  • Class - Progymnospermopsida

Progymnosperms are extinct group of spores bearing woody plants that are assumed to have evolved from the trimerophytes.

  • It is assumed that they give rise to gymnosperms.
  • Rank designated to them is division progymnospermophyta and class progymnospermopsida.
  • Oldest known plant is Protopte…

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Question 3

Appeared in Year: 2019 (IFS)

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Give an account of benthum and hooker system of classification. Despite so many latest classifications, why do people still prefer to use this system of classification?

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Explanation

Bentham and Hooker Classification

  • This system is based on the de Candolle system.
  • It is natural system and was never intended to express a phylogenetic scheme of classification.
  • The system is imbued with the idea of the fixity of species
  • The monocotyledons are placed after the dicotyledons.
  • The dicotyledons began with polypetalae the first order being t…

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Question 4

Appeared in Year: 2016

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Discuss the principle and application of Numerical Taxonomy.

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Explanation

Numerical Taxonomy

  • “The numerical evaluation of the similarity between groups of organisms.”
  • The application of various mathematical procedures to numerically encode characters data for organisms study.
  • It helps to analysis of various types of taxonomic data by mathematical or computerized methods and numerical evaluation of the similarities between t…

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Question 5

Appeared in Year: 2017

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Describe the classification given by Engler and Prandtl and comment onits merits and demerits.

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Explanation

Engler and Prantl Classification

  • The best known and widely accepted phylo­genetic system is that by Adolf Engler, Professor of Botany, University of Berlin. During 1887 - 1915, Engler and his associate Karl Prantl made a monographic work, the “Die naturlichen Pflanzenfamilien” in 20 volumes, including all the known genera of plants from algae to the…

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Question 6

Appeared in Year: 2018

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Compare the systems of classifications proposed by Hutchinson and Cronquist with a note on their merits and demerits. (Paper 1)

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Explanation

Hutchinson System of Classification

  • British botanist John Hutchinson worked at the Kew Royal Botanic Gardens in England.
  • He built and put forward his method on the foundation of Bessey, Hooker, and Bentham. His two-volume work “The Families of Flowering Plants” introduced his evolutionary framework.
  • The first book, which was released in 1926, covers d…

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Question 7

Appeared in Year: 2022 (IFS)

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What are the merits and demerits of Rolf Dahlgren՚s system of classification? (Paper-1)

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Explanation

The updated and enhanced version of his approach progressively surfaced in the succeeding years:

  • i. In 1980 in “Botanical Journal of the Linnean Society” .
  • ii. In 1981, “Phytochemistry and Angiosperm Phytogeny” was published (Edited by Young and Siegier) .
  • iii. In the “Nordiac Journal of Botany” in 1983.

As much as feasible, he included information at …

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Question 8

Appeared in Year: 2021 (IFS)

Write in Short Short Answer▾

Discuss APG IV system of classification. (Paper-1)

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