Optionals IAS Mains Botany: Questions 330 - 337 of 422

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Question 330

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Appeared in Year: 2017

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Essay▾

Merit and demerits of the GM plants in India.

Explanation

GM Plants

GM plants are genetically modified plant whose genetic material has been altered using biotechnology.

GM plants in India

GM Plants in India

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Advantage of GM Plants

  • It increases the yield of plants and improves production that increases farmer’s income.
  • It reduces the use of pesticide as the GM plants are modified so that they prevent attack from p

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Question 331

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Appeared in Year: 2017

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Discuss Ammonification, Nitrification and Denitrification, stating the names of bacteria responsible for each step.

Question 332

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Appeared in Year: 2017

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Allelopathy

Explanation

Alleopathy

  • It is a biological phenomenon. In which a plant or organism produces biochemical that influence the germination growth, survival and reproduction of other organism near them.
  • These biochemical can be beneficial or have negative effect on other organism and plant community. Alleochemicals are type of secondary metabolites and the alleochemi

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Question 333

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Appeared in Year: 2017

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Define botanical Garden and state how it differs from other gardens. Name two internationally reputed botanical gardens. Discuss the role of an ideal botanical in education.

Explanation

Botanical Garden

  • Scientifically planned collection of living trees, shrubs, herbs, climbers and other plants from different parts of world.
  • There is different purpose of botanical gardens-
  • Study of taxonomy and plant growth.
  • Study of introduction and acclimatization process of exotic plants.
  • It acts as Germplasm collection.
  • It helps to develop new hybrid

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Question 334

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Appeared in Year: 2017

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What is Apomixis? Discuss different apomictic developmental pathways with suitable illustrations. Give a note on genetics of apomixes.

Explanation

Apomixis

  • In some plants normal sexual reproduction is not present and it is substituted by an asexual process.
  • This process is called Apomixis and plant which show they are called apomictic plants.
  • According to Winkler term Apomixis refers to any process that substitutes the sexual reproduction without involving the meiosis and syngamy.
  • Different apomi

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Question 335

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Appeared in Year: 2017

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Write the botanical names, active constituents and uses of five plants of economic importance belonging to each of the families Fabaceae, Rosaceae and Brassicaceae.

Explanation

Fabaceae

Shisham

  • Botanical name- Dalbergia sissoo
  • Active constituents- it contain trisaccharides, oligosaccharides, phenol in the leaves.
  • In flower it contains tectorigenin biochanin.
  • In barks it contains flavonoids, dalbergichromene cinnamylphenols, and 4-phenylchromene.

Uses- important timber wood used to make furniture and seen as high quality wood pr

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Question 336

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Appeared in Year: 2017

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Short Answer▾

Explain with examples, the different provisions of author citation.

Question 337

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Appeared in Year: 2017

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Elucidate the role of RNA in the origin and evolution of living organisms.

Explanation

RNA

  • Full form of RNA is ribonucleotids.
  • Ribonucleotide contains a pentose sugar and nitrogen base.
  • The nitrogen bases of RNA adenine, guanine, cytosine and uracil.
  • Adenine and guanine are purines. Whereas cytosine and uracil are pyramids.
  • The four ribonucleotides occur freely in nucleoplasm and also in the form of triphosphates of ribonucleosides.
  • Single

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