Optionals IAS Mains Botany: Questions 292 - 302 of 422

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Question 292

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Appeared in Year: 2016

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Describe different eco-systems. Comment on forest management program.

Explanation

Different Ecosystems

Forest Ecosystems

  • “The communities in a given area which interact among themselves and with physical environment.
  • So, the energy leads to clearly defined exchange of materials within system called ecosystem. “
  • We cannot able to study the whole biosphere at whole.
  • That is why we made artificial sub division into units of small ecosys

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Question 293

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What is Autochory?

Question 294

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Appeared in Year: 2016

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What is the significance of polytene and lamp brush chromosomes? Describe different species of RNA with a note on their functions.

Explanation

Significance of Polytene and Lamp Brush Chromosomes

Lamp Brush Chromosome

  • Each loop looks like in a constant position in the chromosome that helps in the chromosome mapping.
  • Each loop has axis which unfolded form the chromosome for the intense RNA synthesis.
  • Each loop perform intense transcription of hnRNA. RNA polymerase enzyme are attached to the pri

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Question 295

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Appeared in Year: 2016

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What are the check points affected during the cell cycle?

Explanation

Check Points During the Cell Cycle

  • The central control system was operates the cell cycle.
  • Central controller triggers each process in a set sequence.
  • Control system triggers the major processes of the cell cycle.
  • Control system has this role in a cell cycle.
  • A clock that turns on each event at a specific time, and this is how provide fixed amount of ti

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Question 296

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Appeared in Year: 2016

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Explain the basis of molecular sex differentiation.

Explanation

Basis of Molecular Sex Differentiation

  • The embryo acquires its definite sex characteristics by the complex mechanism called sex differentiation.
  • Sex differentiation is the process of development of the differences between male and female from undifferentiated zygote.
  • In human beings and other animals sex differentiation occurs in the following steps:

G

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Question 297

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Appeared in Year: 2016

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Describe the structure of ATPase. How is it suited to phosphorylation?

Explanation

Structure of ATPase

Describe the structure of ATPase

Describe the Structure of ATPase

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ATPase and Phosphorylation

  • In an ATP, a molecule of adenosine is attached with a purine base adenine and anion of D-Ribose sugar.
  • Ado sine is a type of nucleoside.
  • Ado sine sugar attached to phosphate group that cause storage of energy in form of ions.
  • ATP is a high energy exchange medi

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Question 298

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Appeared in Year: 2016

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Describe the methods of conservation of endangered species.

Explanation

Conservation of Endangered Species

  • Protection, uplifting, and scientific management of biodiversity.
  • Including maintenance at its threshold level and derive sustainable benefit.
  • Saving life on earth on its all form.
  • Keeping natural system functioning and healthy.
  • Most species survival and habit are threatened due to human activities.
  • Urgent need to not o

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Question 299

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Appeared in Year: 2016

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Explain the roles of different co-enzymes in plants with suitable examples.

Explanation

Co-enzymes

  • Some enzyme are constituted of entire protein while in others a protein unit called Apo enzyme is attached with another non proteinous co-enzyme that complete in enzyme is called holoenzyme.
  • In this type of enzymes neither the appearance not co-factor is capable of functioning catalyst separately.
  • The co-enzyme is the small molecular weight

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Question 300

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Appeared in Year: 2016

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How are membranes arranged in chloroplast to suit its functions?

Explanation

Membranes Arranged in Chloroplast

  • Chloroplast is double membraned organelle.
  • The inner envelope and outer envelope and outer envelope.
  • Along with that it have third internal membrane system called thylakoid membrane.
  • Thylakoid membrane form network of thylakoid which arranged as stack called grana.
  • These 3 membranes divide chloroplast into 3 different i

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Question 301

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Explain life cycle of Riccia.

Explanation

Life Cycle of Riccia

  • It is a Liverwort (Bryophytes).
  • Plant body is Gametophyte (n) and thallose (i. e. not differentiated in Root, Stem, Leaves) type.
Explain life cycle of Riccia

Explain Life Cycle of Riccia

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  • In place of root, rhizoid is present.
  • Rhizoids are unbranched and unicellular. They are of two types smooth walledtuberculated or . In smooth walled rhizoid in

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Question 302

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Appeared in Year: 2016

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Comment on cytoplasmic genes and explain the cytoplasmic inheritance with different examples.

Explanation

Cytoplasmic Genes

  • Cytoplasmic genes are the genes that occur outside the nucleus.
  • It is found in most eukaryotes and is commonly known to occur in cytoplasmic organelles such as mitochondria and chloroplast.
  • Or may be found from cellular parasites like viruses or bacteria.
  • Cytoplasmic inheritance is the inheritance that transfers through the genes outs

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