IFS (Forests Services) Botany (Mains): Questions 34 - 42 of 287

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Question number: 34

» Plant Utility and Exploitation » Botanical Gardens and Herbaria

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Appeared in Year: 2015

Essay Question▾

Describe in Detail

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

Explanation

Definition:

  • A herbarium is a collection of plant samples preserved for long term study.

  • A herbarium is a collection of dried plants or fungi used for scientific study. Herbaria are the main source of data for the field of botany called taxonomy.

  • Herbaria are plural for herbarium.

  • Herbaria are usually associated with universities, museums, or botanical

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Question number: 35

» Phanerogams » Gymnosperms

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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 also called as pollen grain.

  • Polle

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Question number: 36

» Plant Utility and Exploitation » Origin of Cultivated Plants

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Appeared in Year: 2015

Essay Question▾

Describe in Detail

What is plant quarantine? (Paper-1, Section-A)

Explanation

Meaning of Plant Quarantine

Plant quarantine means the effort of prevent entry, establishment or spread of a foreign pest in the country by imposing legal restriction on the movement of plant and plant products.

  • Plant quarantine is a mechanism or technique by which disease and pest free plants are formed.

  • Aim of plant quarantine is to the protect the

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Question number: 37

» Genetics, Molecular Biology and Evolution » Mutation

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Essay Question▾

Describe in Detail

Give two popular examples where genetic differences influence induction of mutation. (Paper 2, Section A)

Explanation

What is Mutation?

A mutation is a permanent change in the sequence of DNA.

Mutations are physical changes in genes and chromosomes.

They may be confined to a single cell or may be transmitted from one cell to another within a multicellular organism or may be transmitted from one generation to another through mutation in the gametes.

Induction of mutati

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Question number: 38

» Genetics, Molecular Biology and Evolution » Linkage and Crossing Over

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Appeared in Year: 2015

Essay Question▾

Describe in Detail

What are the merits of pedigree methods? (Paper 2, Section A)

Explanation

What is Pedigree Method?

  • Individual plants are selected from F2 and the subsequent generation and their progenies are tested.

  • Pedigree record is the record of the entire parent’s offspring relationship in this process

  • Selection of individual plant is continued till the progenies show no segregation.

  • Selection is done among the progenies as there would

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Question number: 39

» Genetics, Molecular Biology and Evolution » Prions and Prion Hypothesis

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Appeared in Year: 2015

Essay Question▾

Describe in Detail

Suggest why prions should not be included among viruses. (Paper 2, Section A)

Explanation

  • Prions are infectious agents of diseases in animals and humans and probably represent the simplest form of life on earth.
  • Prions are rod-shaped particles and consider as smaller than viruses.
  • The rods contain one prion protein is called PrP (prion protein).
  • Viruses contain DNA or RNA, which specify the structure of proteins. The genetic information in

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Question number: 40

» Genetics, Molecular Biology and Evolution » Linkage and Crossing Over

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Appeared in Year: 2015

Essay Question▾

Describe in Detail

How will you distinguish cytologically between paracentric inversion and pericentric inversion? (Paper 2, Section A)

Explanation

Paracentric:

  • Paracentric inversions do not occur in the centromere.

  • Crossing over only occurs in the out the loop in one arm of the chromosome.

  • The result is a large loop in where recombination occurs in only part of the loop.

  • When crossover occurs within the loop, it causes the cells to die during meiosis.

  • This means that the only possible outcomes for

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Question number: 41

» Genetics, Molecular Biology and Evolution » Genetic Code

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Appeared in Year: 2015

Essay Question▾

Describe in Detail

Is the genetic code universal? (Paper 2, Section A)

Explanation

What is genetic code?

  • The set of DNA and RNA sequences that determine the amino acid sequences used in the synthesis of an organism’s proteins.

  • The set of 64 codons are corresponding to the 20 amino acids which are used for protein synthesis and as the signals for starting and stopping protein synthesis.

  • It is the biochemical basis of heredity and nea

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Question number: 42

» Cryptogams » Fungi

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

What are the different types of flagella found in fungi? (Paper A Section A)

Explanation

  • There are mainly two types of flagella;
Image showing flagella types.

Image Showing Flagella Types.

Tinsel type: Flagellum with a large number of hair like outgrowths (cilia) all around its surface.

Whiplash type: A long thread like structure being rigid at the base with 11 fibrils and thinner towards the apex as the 2 central fibrils project out. The latter portion is flexible.

  • Di

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