Phanerogams-Gymnosperms (IFS (Forests Services) Botany (Mains)): Questions 1 - 7 of 7

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Question number: 1

» Phanerogams » Gymnosperms

Appeared in Year: 2015

Essay Question▾

Describe in Detail

Draw the LS of Pinus seed (Paper-1, Section-A)

Explanation

Image showing Pinus seed L.S.

Image Showing Pinus Seed L. S.

Pinus is gymnosperms and it has a naked seed. After the gametophyte ovum is fertilized to become a zygote and the ovule becomes a seed.

Pinus is gymnosperms and it has a naked seed. After the gametophyte ovum is fertilized to become a zygote

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Question number: 2

» Phanerogams » Gymnosperms

Appeared in Year: 2015

Essay Question▾

Describe in Detail

Discuss the stages of development of male gametophyte in Pinus before pollination. (Paper-1, Section-A)

Explanation

Spores are the main units for the gametophytic life cycle.

  • In pinus, spores are mainly two types; microspores and megaspores.

  • Microspores are germination to give rise to male gametophyte and megaspores germination to give rise to female gametophyte.

  • In Pinus male gametophyte, microspore is the unit of it.

  • Microspore is

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Question number: 3

» Phanerogams » Gymnosperms

Appeared in Year: 2014

Essay Question▾

Describe in Detail

Comment on the structure, location and function of transfusion tissue. (Paper A Section A)

Explanation

Definition:

  • Transfusion tissue is lying on the vascular bundles of gymnosperm leaves and consists of both living cells like those of parenchyma with walls that are not lignified and thin-walled but lignified tracheids with bordered pits.
  • Transfusion tissue is composed of tracheids with bordered pits and parenchyma cells containing tannin-like
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Question number: 4

» Phanerogams » Gymnosperms

Appeared in Year: 2014

Essay Question▾

Describe in Detail

Why are gymnosperms called naked-seeded plants? (Paper - 1, Section - B)

Explanation

  • Gymnosperms do not produce fruit, their seeds are naked or exposed to the elements without a layer of fruit to protect them.

  • Gymnosperms are different from angiosperms on the basis of the naked-seed habit and enclosure of seeds within a fruit in the latter.

  • Gymnosperm pollen lands directly on the

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Question number: 5

» Phanerogams » Gymnosperms

Appeared in Year: 2014

Essay Question▾

Describe in Detail

Draw scientifically accurate diagrams of the following and label the parts: Anatomy of Pinus needle (Paper - 1, Section - B)

Explanation

 Image showing Pine needle anatomy.

Image Showing Pine Needle Anatomy.

The Pine or Pinus needle shows xerophytic habitat in which it grows and is internal structure shows various features.

Anatomy of Pinus needle or Pinus leaf:

Epidermis:

  • Single layered, thick walled and cutinized.

  • Stomata are distributed the entire surface of the leaf, so the leaf

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Question number: 6

» Phanerogams » Gymnosperms

Appeared in Year: 2013

Essay Question▾

Describe in Detail

Write brief and critical notes on the following: Affinities of Gymnosperms with Angiosperms (Paper 1, Section B)

Explanation

  • The plants are woody and perennial.

  • The stele is eustelic. Secondary growth as in dicots. The secondary wood may be manoxylic or pycnoxylic.

  • The vascular tissue is well developed, but vessels are absent (except in Gnetum). Phloem is devoid of companion cells.

  • Both are heterosporic and endosporic.

  • Megaspore is retained

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Question number: 7

» Phanerogams » Gymnosperms

Appeared in Year: 2013

Essay Question▾

Describe in Detail

Write brief and critical notes on the following: Manoxylic and Pycnoxylic wood (Paper 1, Section B)

Explanation

The secondary wood in the gymnosperms may be manoxylic or pycnoxylic.

Manoxylic wood:

  • Manoxylic wood is soft and parenchymatous.

  • Manoxylic wood is not commercially useful.

  • Manoxylic wood is the non-compact wood with large pith and cortex mixed with less amount of xylem tracheids or wood.

  • Parenchyma cells are filled with

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