Optionals IAS Mains Botany: Questions 199 - 208 of 422

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Question 199

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Appeared in Year: 2015

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Essay▾

Explain Inflorescence in Musaceae (Paper 2)

Explanation

Inflorescence in Musaceae

  • Inflorescence of plant produces a single terminal inflorescence which springs from the rhizome and emerges at the top of the pseudo-stem.
  • Numerous flowers together are arranged collaterally in racemes.
  • These flowers are protected by large brightly coloured spadix-like bracts.
  • These bracts fall off as the flowers open.
  • And the f

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Question 200

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Appeared in Year: 2015

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Diseases caused by mycoplasma. (Paper 2)

Explanation

Mycoplasma

  • Mycoplasma is the smallest known aerobic prokaryotes without a cell wall.
  • In plants mycoplasma produce disease usually by upsetting the hormonal balance.
  • The imbalance is expressed in the form of symptoms such as dwarfness, loss of apical dominance and enlargement of floral buds and brunchy growth of newly formed sprouts.
  • In plants mycoplasm

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Question 201

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Appeared in Year: 2014

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Describe stepwise how goodness of fit is established for an assumption? (Paper 2)

Explanation

The Goodness fit Test

  • They are statistical hypothesis test to see how good sample data fit a distribution from population with the normal distribution.
  • It shows is your sample data represents the data you would expect to find in the actual population or it is somehow is gone skewed.
  • There are many methods to determine the goodness of fit most popular

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Question 202

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Appeared in Year: 2015

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Draw the well labelled diagram of L. S of strobilus of sleginella and discuss its main feature.

(Paper 2)

Explanation

Sleginella

  • The section of strobilus axis with which is attached micro and megasporophyll.
  • The strobilus shows the presence of both microsporangia and Megasporangia. In some species one side of the strobilus bears microsporangia and other side bears Megasporangia.
  • Usually the Megasporangia are located in the basal portion and the microsporangia in the

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Question 203

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Appeared in Year: 2015

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With the help of suitable diagram, describe the development of sporophyte in bryophyte. (Paper 2)

Explanation

Development of Sporophyte Found in Bryophyte

the development of sporophyte in bryophyte

The Development of Sporophyte in Bryophyte

Loading image

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Question 204

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Appeared in Year: 2014

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How are Ribosome synthesized? (Paper 2)

Explanation

Ribosome Synthesis

Synthesis of ribosome various component is under genetic control that are Transcripted by genes.

Synthesis of 70s Ribosome

  • The ribosomal genes are in single operon which is transcribed as a unit, to synthesis molecule of RNA containing 16s, 23s, 5s rRNA sequence.
  • rRNA if greatly stabilized and protected by ribosomal proteins and thus

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Question 205

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Appeared in Year: 2014

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Can an accessory chromosome becomes an essential chromosome? (Paper 2)

Explanation

Accessory Chromosome

  • B chromosomes are a heterogeneous class of chromosome found in nucleus and called accessory chromosome.
  • These accessory chromosomes are not essential chromosome as they are not essential for life as they are not even present in all individuals.
  • B chromosome are different from maker chromosome or additional copies of normal chromos

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Question 206

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Appeared in Year: 2015

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Essay▾

Powdery mildew diseases in plants. (Paper 2)

Explanation

Powdery Mildew Diseases in Plants

  • mildews is disease in with the pathogen grows mostly on the surface of the host and appears in the form of white, grey, brown leaves, youngest and fruits.
  • When the spores are in the form of powdery layer on the host surface, they are called as powdery mildews.

Causal Organism

  • Disease is caused by the member of Erysipha

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Question 207

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Appeared in Year: 2015

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Essay▾

Comment upon the palmella stage. (Paper 2)

Explanation

Palmella Stage

  • A Colonial aggregate of immobile non-flagellated individuals occurring regularly in the life cycle.
  • Unlike coenobial forms, in a palmelloid colony the number of cells, their shape and size is not definite.
  • The cells remain irregularly aggregated within a common mucilaginous matrix.
  • They are independent and function as individuals.
  • In some

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Question 208

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Appeared in Year: 2015

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Short Answer▾

What are the salient features of the family Poaceae? (Paper 2)