Phanerogams-Gnetales [IFS (Forests Services) Botany (Mains)]: Questions 1 - 5 of 5

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Question number: 1

» Phanerogams » Gnetales

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Appeared in Year: 2015

Essay Question▾

Describe in Detail

Compare the morphological characters of male and female strobili in Gnetum. (Paper-1, Section-A)

Explanation

Gnetum is dioecious.

  • The reproductive organs are organized into well-developed cones or strobili.

  • Gnetum have male and female reproductive organs on separate plants.

  • Gnetum belongs to gymnosperms so they do not have flowers and instead of that cones or strobili sporangia bearing structure present at the tip of the axis.

Male cone or staminate strobilus

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Question number: 2

» Phanerogams » Gnetales

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

What are the angiospermic features of Gnetum? (Paper - 1, Section - B)

Explanation

  • Gymnosperms have naked-seeds but not fruits or flowers.

  • Gymnosperms developed during the Paleozoic Era and became dominant during the early Mesozoic Era.

  • The presence of companion cells in the angiosperms is one of the constant anatomical features which distinguish gymnosperm with the angiosperm.

  • Gnetum belongs to gymnosperm plants but it has some fea

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Question number: 3

» Phanerogams » Gnetales

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

“Gnetum is a link between seed plants and seedless plants. “Justify the statement.

Explanation

Gnetum is called the link between seed plants and seedless plants. Seedless plant in this question is pteridophytes whereas seed plants are gymnosperm. So we can understand the gnetum as a link between gymnosperm and pteridophyte by studying the gnetum resemblance with gymnosperms and pteridophyte.

Gnetum resemblance with gymnosperm

  • The woods of gnet

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Question number: 4

» Phanerogams » Gnetales

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

What are the angiospermic feature of gnetum?

Explanation

Gnetum resemblance with angiosperm

Both derived from common stock hemiangiosperms and had parallel evolution

  • In general habit sporophyte of gnetum climber or tree-like resembles angiosperms.

  • The leaves of gnetum are broad and green with reticulate venation and opposite state arrangement as an angiosperm.

  • All the main types of scattered formed in angios

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Question number: 5

» Phanerogams » Gnetales

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Appeared in Year: 2015

Essay Question▾

Describe in Detail

Compare the morphological character of male and female strobili in Gnetum. (Paper 2)

Explanation

Male strobili of Gnetum

  • The male strobili are borne in the axils of leaves.

  • The strobili may be branched or unbranched.

  • Each male strobilus has a long stout axis divided into nodes and internodes.

  • The axis bear 10 - 15successive pairs of sterile and connate bracts which fuse in pairs at each node forming cup like structure called collars.

  • The growth of

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