Cryptogams-Pteridophytes (IFS (Forests Services) Botany (Mains)): Questions 1 - 6 of 6

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Question number: 1

» Cryptogams » Pteridophytes

Appeared in Year: 2015

Essay Question▾

Describe in Detail

Draw a well-labelled diagram through median LS of strobilus of Selaginella and discuss its main features. (Paper-1, Section-A)

Explanation

Knowing theLS of strobilus of Selaginella

Knowing theLS of Strobilus of Selaginella

What are the various parts of LS of strobilus of Selaginella

  • Selaginella is unique, however, from other lycophytes in that their strobili contain two different types of spores; megaspores and microspores.

  • There are two types of sporangia in Selaginella; Megasporangia and Microsporangia.

Megasporangia

  • Megasporangia

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Question number: 2

» Cryptogams » Pteridophytes

Appeared in Year: 2014

Essay Question▾

Describe in Detail

What are the xerophytic and hydrophytic characters found in the rhizome anatomy of Equisetum? (Paper A Section A)

Explanation

Xerophytic characters of Equisetum plant are:

  • Presence of thick coat of cuticle all over the epidermal layer of stem.

  • Photosynthetic stem having chlorenchymatous cortex.

  • Stem behaving as leaves.

  • Presence of small, scale like leaves with limited number of chloroplast.

  • Presence of sunken stomata in groove of stem.

  • Stiff epidermis and

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Question number: 3

» Cryptogams » Pteridophytes

Appeared in Year: 2013

Essay Question▾

Describe in Detail

Discuss briefly the following: Importance of Heterospory (Paper 1, Section A)

Explanation

  • Heterospory is the production of spores of two different sizes and sexes by the sporophytes of land plants.
  • The condition of the production of two kinds of dissimilar spores, differing in shape and size in the same species is termed Heterospory.
  • Two types of spore producing structures in heterosporous species
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Question number: 4

» Cryptogams » Pteridophytes

Appeared in Year: 2013

Essay Question▾

Describe in Detail

Discuss briefly the following: Morphological nature of sporocarp of Marsilea (Paper 1, Section A)

Explanation

Morphological nature of sporocarp has been controversial and atleast two different hypotheses have been proposed.

A) Leaf segment hypothesis or laminar hypothesis

  • According to this hypothesis the sporocarp is homologous with a modified, lateral fertile segment of the leaf. This theory has been supported by a large number of scientists

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Question number: 5

» Cryptogams » Pteridophytes

Appeared in Year: 2013

Essay Question▾

Describe in Detail

Differentiate between the following: Eusporangiate and Leptosporangiate ferns (paper 1, Section A)

Explanation

Based on development the sporangia have been classified by Goebel (1881) into two groups; Eusporangiate and Leptosporangiate.

Differences between Eusporangiate and Leptosporangiate

Table showing the Differences between Eusporangiate and Leptosporangiate

Eusporangiate

Leptosporangiate

In eusporangiate, large sporangium develops from many initial cells and produces many spores.

In leptosporangiate, small sporangium develops

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Question number: 6

» Cryptogams » Pteridophytes

Appeared in Year: 2013

Essay Question▾

Describe in Detail

Discuss briefly the following: Diversity and distribution of Indian Pteridophytes (Paper 1, Section A)

Explanation

  • There are 305 Genera and 13000 species of Pteridophytes all over the world.

  • India with a highly variable climate has a rich flora of Pteridophytes.

  • As far as diversity and distribution of Pteridophytic flora are concerned, there are about 1100 - 1200 species of ferns and its allies that are

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