IFS (Forests Services) Botany (Mains): Questions 136 - 145 of 160

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Question number: 136

» Microbiology and Plant Pathology » Physiology of Parasitism & Control

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

Citing suitable examples, explain how laxity is quarantine procedure can have disastrous effects.

Explanation

  • Plant quarantine is a type of prophylactic measure.

  • The prophylactic measure is preventive and includes protection of the host from exposure to the pathogen from infection or from environmental factors favourable to disease development.

  • Plant quarantine is a legal restriction to the national or international level on the trade of propag

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Question number: 137

» Cell Biology » Prokaryotic and Eukaryotic Cells

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

Differentiate between prokaryotes and eukaryotes.

Explanation

Prokaryotes are organism which have prokaryotic type of cells whereas eukaryotes are the organism which have Eukaryotic type of cells.

  • prokaryotic are basically one envelope system in comparison to Eukaryotic they are smaller in size.

  • unlike Eukaryotic they lack double membrane cell organelle e. g. endoplasmic reticulum mitochondria chloro

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Question number: 138

» Plant Utility and Exploitation » Ethnobotany

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

“Ethnobotany provides important clues to the discovery of Morden drugs. “Justify the statement giving suitable example.

Explanation

  • Ethnobotany the ancient man has accurate recognition of non-poisonous plants that he can utilise.

  • In India study of plant in Rigveda that divided into three parts vrska, Osadhi, Virudha (the Creepers).

  • Ethnobotany is a term that is derived from the ethnology (that is study of culture).

  • The scientific study of the relationship that e

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Question number: 139

» Cryptogams » Bryophytes

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

Discuss the role of amphibious plants in the evolution of land plants.

Explanation

  • Bryophytes works as link between aquatic plants and land plants (pteridophyts, gymnosperms, and angiosperms)

  • But most of the resemblance of bryophyte is seen with Pteridophytes.

  • Bryophytes have originated from some aquatic ancestor. bryophtes were pioneers in establishing themselves on land and opened up the opportunities for different

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Question number: 140

» Cryptogams » Fungi

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

How significant is Para sexuality in aspergillus?

Explanation

  • Para sexuality is a genetic recombination without sexual reproduction was observed in Aspergillus nidulans by rapper and he called it Para sexuality.

  • In Para sexuality plasmogamy, karyogamy, and meiosis do take place but not in at specific time or specific point in the life cycle of fungus.

  • The phenomena Para sexuality is of common occu

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Question number: 141

» Cryptogams » Algae

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

Advantage of diploid carposporophyte in red algae?

Explanation

  • In red alage Triphasic type of lifecyle is seen in red alage-

    • Haplobiontic Triphasic type

    • Diplobiontic Triphasic type

  • There are two diploid phase Carposporophyte and tetrasporophyte alternating with haploid gametophyte phase.

  • Male and female gametes fuse together to form zygote. further,

  • In alage like florideace the fertiliza

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Question number: 142

» Cryptogams » Bryophytes

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

What is the heterotrichous habit of moss protonema growth?

Explanation

  • There are two type protonema. primary protonema and secondary protonema.

  • On germination the spore gives rise to a branched filamentous structure known as primary protonema.

  • Heterotrichous protonema is a tyoe of protonema in which thallus is diffrentiated into a postrate portion and an upright or projrcted system

  • They are mostly found

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Question number: 143

» Angiosperms » Embryology

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

Comment on Plumbago type of embryo sac development.

Explanation

Plumbago is a type of tetrasporic embryo sacs

In some plants miotic division of the megaspore mother cell is not accompanied by cytokinesis and hence all four haploid nuclei are present in single cell and called coeno-megaspore.

  • All the four nuclei of coeno-megaspore participate in the formation of embryo sac.

  • This type of embryo sacs are

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Question number: 144

» 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

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Question number: 145

» 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

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