IFS (Forests Services) Botany (Mains): Questions 30 - 39 of 160

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Question number: 30

» Microbiology and Plant Pathology » Major Plant Diseases

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Appeared in Year: 2015

Essay Question▾

Describe in Detail

Write short note on: Powdery mildew diseases in plants (Paper-1, Section-A)

Explanation

Definition:

  • Powdery mildew is a fungal disease of the foliage, stems and occasionally flowers and fruit where a superficial fungal growth covers the surface of the plant.

  • Powdery mildews are a group of related fungi which attack a wide range of plants, causing a white, dusty coating on leaves, stems and flowers.

How to Identify Powdery

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Question number: 31

» Plant Utility and Exploitation » Things We Get from Plants

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Appeared in Year: 2015

Essay Question▾

Describe in Detail

Explain that plants are sources of spices (Paper 1, Section B)

Explanation

  • Spices are plant products used in flavoring foods and beverages.
  • From many of years, aromatic plant materials have been used in food preparation and preservation.

  • Spices do not refer to a specific kind of plant or plant part.

  • Spices come from various woody shrubs and vines, trees, aromatic lichens, and the roots, flowers, seeds, and fr

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Question number: 32

» Angiosperms » Anatomy

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Appeared in Year: 2015

Essay Question▾

Describe in Detail

Write the distinguishing features of Orchidaceae. (Paper 1, Section B)

Explanation

About Orchidaceae

  • Orchidaceae is largest family in flowering plants and they are terrestrial, epiphytic or saprophytic herbs.
  • Orchid flowers are in different color except black.

  • Mainly found in warm and moist places and also found in dry or seasonally cold environment like savannahs and semi deserts.

  • The characteristics of the orchid f

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Question number: 33

» Cryptogams » Algae

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Appeared in Year: 2015

Essay Question▾

Describe in Detail

What is the main basis of classification in algae? Describe the important characters of various classes of algae. (Paper-1, Section-A)

Explanation

The presence or absence of pigments which transmit colour to the algae forms is the main basis of classification of algae.

Image shows Various types of algae explained

Image Shows Various Types of Algae Explained

Various types of algae explained

The divisions are based on the factors

  • Major photosynthetic pigments present,

  • Form of stored food,

  • Cell wall composition and

  • Numb

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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, m

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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

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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

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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

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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 proge

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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 inform

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