Optionals IAS Mains Botany: Questions 237 - 243 of 422

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Question 237

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Appeared in Year: 2015

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“Tricarboxylic acid cycle is an amphibolic process. ” Explain. (Paper II)

Explanation

Tricarboxylic Acid an Amphibolic Process

  • Any biochemical pathway which involves both metabolic processes catabolism and anabolism is known as amphibolic pathways.
  • Tricarboxylic acid cycle, citric acid cycle or kerbs cycle is and amphibolic process.
  • As in all eukaryotic cell and many bacteria under aerobic condition oxidation of organ fuels are convert

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Question 238

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Appeared in Year: 2015

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X/A ratio is not only a primary sex determining signal but has several major regulatory genes in function. Discuss what role they play in sex differentiation, with suitable examples. (Paper II)

Question 239

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Appeared in Year: 2015

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How will you distinguish cytologically between paracentric inversion and pericentric inversion. (Paper II)

Explanation

Inversion

  • Inversion involves a rotation of a part of a chromosome or a set of genes by 180 degree on its own axis.
  • It essentially involves occurrence of breakage and reunion. The net result of inversion is neither a gain nor a loss in the genetic material but simply a rearrangement of the gene sequence.
  • Inversion heterozygote has one chromosome in the

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Question 240

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Appeared in Year: 2015

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Why is Agrobacterium tumefaciens the most popular and important tool in genetic engineering of plant systems? Describe the various steps used in T-DNA mediated transfer of foreign genes into plants. (Paper II)

Question 241

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Appeared in Year: 2015

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Describe the phenomenon of ‘biomagnification’ with special reference to chlorinated hydrocarbons. (Paper II)

Question 242

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Appeared in Year: 2015

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How does El Nino result in extensive disruption of weather around the world? (Paper II)

Question 243

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Appeared in Year: 2015

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Explain Binomial and Poisson distribution. (Paper II)