IFS Botany (Mains): Questions 31 - 40 of 119

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Question number: 31

» Plant Utility and Exploitation » Things We Get From Plants

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… (267 more words) …

Question number: 32

» Angiosperms » Anatomy

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… (159 more words) …

Question number: 33

» Cryptogams » Algae

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… (154 more words) …

Question number: 34

» Plant Utility and Exploitation » Botanical Gardens and Herbaria

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… (463 more words) …

Question number: 35

» Phanerogams » Gymnosperms

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… (257 more words) …

Question number: 36

» Plant Utility and Exploitation » Origin of Cultivated Plants

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.… (264 more words) …

Question number: 37

» Genetics, Molecular Biology and Evolution » Mutation

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… (423 more words) …

Question number: 38

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

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… (129 more words) …

Question number: 39

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

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… (193 more words) …

Question number: 40

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

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… (333 more words) …

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