IFS (Forests Services) Botany (Mains): Questions 57 - 64 of 160

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Question number: 57

» Plant Utility and Exploitation » Botanical Gardens and Herbaria

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

Differentiate between Isotype and Syntype. (Paper - 1, Section - B)

Explanation

Isotype:

  • A duplicate specimen of the holotype is called isotype and it is always a specimen.

  • An isotype is a biological specimen duplicate of the holotype collected in the same place and at the same time and by the same person.

  • Sometimes the collection number is also the same and differentiated as a, b, c, etc.

  • In fossil plants it

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Question number: 58

» Angiosperms » Brassicaceae

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

What are unique features of Brassicaceae? (Paper - 1, Section - B)

Explanation

Unique features of Brassicaceae:

  • Habit: Usually annual or perennial herbs.

  • Root: Taproot system.

  • Stem: Herbaceous, erect and branched.

  • Leaves: - Simple, alternate, radical, usually entire, deeply lobed and pinnatifid (pinnately divided).

  • Flowers: - Bisexual, heterochlamydeous, actinomorphic and without subtending bracts (ebracteate)

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Question number: 59

» Angiosperms » Pollination an Fertilization

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

Comment on the Stratification of pollen grain walls. (Paper - 1, Section - B)

Explanation

  • Pollen is micro gametophytes of seed plants which produce the male gametes or sperm cells.

  • Pollen grains have a hard coat that protects the male gametes during the process of their movement between the stamens to the pistil of flowering plants or from the male cone to the female cone of coniferous plants.

  • When pollen lands on a pistil o

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Question number: 60

» Angiosperms » Development of Male and Female Gametophytes

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

Stages depicting the formation of vegetative and generative cells during male gametophyte development in angiosperms (Paper - 1, Section - B)

Explanation

  • Development of male gametophyte starts in pollen grains.

  • Microspore undergoes mitotic divisions and forms two unequal cells; vegetative cell and generative cell.

  • The larger cell is called vegetative cell and the smaller cell is called generative cell or germinative cell.

  • Vegetative cell is also called as tube cell.

  • Vegetative ce

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Question number: 61

» Angiosperms » Patterns of Embryo Development

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

Comment on Plumbago type of embryo sac development. (Paper - 1, Section - B)

Explanation

Tetrasporic Embryosac:

  • It is formed by all four megaspore nuclei because meiosis is not accompanied by Cytokinesis, so that four nuclei of megaspores are formed.

  • All four nuclei are collectively known as “Coenomegaspore”.

  • Generally all the four Nuclei of megaspores take part in the formation of the seven celled and eight nucleated embr

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Question number: 62

» Phanerogams » Gymnosperms

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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 ovule, where in angiosperm pollen lands

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Question number: 63

» Cryptogams » Bryophytes

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

Draw scientifically accurate diagrams of the following and label the parts: L. S. of capsule of Funaria (Paper - 1, Section - B)

Explanation

Image showing L.S. of capsule of Funaria

Image Showing L. S. Of Capsule of Funaria

Capsule is a part of sporophyte and the sporophyte in Funaria is called as sporogonium and is green in colour while is young and become reddish brown at mature.

Funaria capsule:

  • A mature sporogonium or sporophyte of Funaria is borne at the end of the female branch.

  • It differentiated into foot,

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Question number: 64

» Angiosperms » Ranunculaceae

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

Draw scientifically accurate diagrams of the following and label the parts: Floral formula and floral diagram of Ranunculaceae and Rosaceae (Paper - 1, Section - B)

Explanation

Ranunculaceae:

 Image showing floral formula & floral diagram of Ranunculaceae

Image Showing Floral Formula & Floral Diagram of Ranunculaceae

There is 5 calyx and 5 corolla is present which are free, stamens are numerous, carpels are numerous and flower is bisexual.

Rosaceae:

Image showing floral formula and diagram of Rosaceae family

Image Showing Floral Formula and Diagram of Rosaceae Family

In Rosaceae family, flowers are actinomorphic, 5 free sepals, 5 free petals, numerous stamens and carpels are either one to five and syncarpous.