Phanerogams (IFS Botany): Questions 1 - 10 of 13

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Question number: 1

» Phanerogams » Cordaitales

Appeared in Year: 2015

Essay Question▾

Describe in Detail

TS of leaf of Cordaites. (Paper-1, Section-A)

Explanation

Image showing T.S of leaf of Cordaites.

Image Showing T. S of Leaf of Cordaites.

Cordaites are primitive trees that went extinct millions of years ago. In transverse section of leaf showing various part like xylem, phloem epidermis and bundle sheath.

Cordaites are primitive trees that went extinct millions of years ago. In transverse section of leaf… (10 more words) …

Question number: 2

» Phanerogams » Gnetales

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.… (119 more words) …

Question number: 3

» 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… (6 more words) …

Question number: 4

» 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… (257 more words) …

Question number: 5

» 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… (255 more words) …

Question number: 6

» 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… (156 more words) …

Question number: 7

» 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… (262 more words) …

Question number: 8

» Phanerogams » Gnetales

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… (143 more words) …

Question number: 9

» 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… (156 more words) …

Question number: 10

» Phanerogams » Coniferrals

Appeared in Year: 2013

Essay Question▾

Describe in Detail

Make a comparison of the following: Long shoot and dwarf shoot of Pinus (Paper 1, Section B)

Explanation

Long shoot of Pinus versus Dwarf shoot of Pinus

Table showing the Long shoot of Pinus versus Dwarf shoot of Pinus

Long shoot of Pinus

Dwarf shoot of Pinus

Long shoot also called as branches of unlimited growth or long laterals.

Dwarf shoot also called as branches of limited growth… (76 more words) …

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