Optionals IAS Mains Botany: Questions 82 - 89 of 511

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Question 82

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Appeared in Year: 2013 (IFS)

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Essay▾

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

Explanation

Affinities of Gymnosperms with Angiosperms

  • 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 …

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Question 83

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Appeared in Year: 2013 (IFS)

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Essay▾

Discuss briefly the following: Importance of Heterospory (Paper 1, Section A)

Explanation

Importance of Heterospory

  • Heterospory is the production of spores of two different sizes and sexes by the sporophytes of land plants.
  • The condition of the production of two kinds of dissimilar spores, differing in shape and size in the same species is termed Heterospory.
  • Two types of spore producing structures in heterosporous species are microsporang…

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Question 84

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Appeared in Year: 2013 (IFS)

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Essay▾

Differentiate between the following: Holocarpic and Eucarpic fungi (Paper 1, Section – A)

Explanation

Holocarpic and Eucarpic Fungi

In fungi, asexual reproduction is predominant and is depending upon the involvement of the entire thallus or a part of thallus, the fungi may be Holocarpic or Eucarpic.

Table Showing the Difference between Holocarpic and Eucarpic
HolocarpicEucarpic
In Holocarpic fungi, the entire thallus gets converted into one or more reproductive bodies.In Eucarpic fungi, only a part of the thallus is involved in the development of reproductive organs and remaining thallus remains vegetative.

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Question 85

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Appeared in Year: 2013 (IFS)

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Essay▾

Write short notes on the following: Ethnobotany (Paper 1, Section B)

Explanation

Ethnobotany

  • Ethnobotany is the branch of ethnobiology and is the scientific study of the interrelationship between people and plants.
  • Ethnobotany is the science of people՚s interactions with plants.
  • In Ethnobotany, ethno means study of people and botany means study of plants.
  • The term Ethnobotany was coined in 1895, by J. M. Harshberger, an American bo…

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Question 86

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Appeared in Year: 2013 (IFS)

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One Liner▾

Write the botanical name, family and part used of each of the following: Castor (Paper 1, Section B)

Question 87

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Appeared in Year: 2013 (IFS)

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Essay▾

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

Explanation

Long Shoot and Dwarf Shoot of Pinus

Table Showing the Long Shoot of Pinus Versus Dwarf Shoot of Pinus
Long Shoot of PinusDwarf Shoot of Pinus
Long shoot also called as branches of unlimited growth or long laterals.Dwarf shoot also called as branches of limited growth or short laterals.
Long shoots contain apical bud.Dwarf shoots are devoid of any apical bud.

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Question 88

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Appeared in Year: 2013 (IFS)

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One Liner▾

Write the botanical name, family and part used of each of the following: Areca nut (Paper 1, Section B)

Question 89

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Appeared in Year: 2013 (IFS)

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Essay▾

Discuss briefly the following: Endospore formation in bacteria and its significance (Paper 1, Section A)

Explanation

Endospore Formation in Bacteria

  • An endospore is an extremely resistant dormant cell structure produced by some bacterial species.
  • Endospore means; endo means inside and spore means to the dormant structure, so the endospore is a structure formed inside the cell.
  • There are many examples of endospore forming bacteria.
  • The two most common are Clostridium …

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