Optionals IAS Mains Botany: Questions 184 - 192 of 511

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Question 184

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Appeared in Year: 2014 (IFS)

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What is achieved through back cross breeding? Describe the procedure and explain what will happen if the original parent are not pure lines? (Paper 2)

Explanation

Backcross Breeding

  • Backcross breeding is a crossing an offspring with one of its parent to achieve offspring with a genetic identity closer to its parent and also sometime to identify that their parents are pure line or not.
  • Nowadays backcross breeding is used to make artificial desired type of plants and with the help of backcross method it is less …

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Question 185

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Appeared in Year: 2015 (IFS)

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Write short notes on the Herbaria (Paper 2)

Explanation

Herbaria

  • Herbarium can be defined as the collection or depository or dried plants specimens. Harbaria is a plural form of herbarium.
  • It objective is to collect plants from a field and preserve them for future reference and further studies.
  • There is some field equipment that is used throughout the process of preparing herbarium.
    • Plant press
    • Field noteboo…

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Question 186

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Appeared in Year: 2015 (IFS)

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What is Parthenocarpy? (Paper 2)

Explanation

Parthenocarpy

  • It can be defined simply as naturally or artificially development of fruit without pollination and fertilization.
  • In some cases of angiosperms the ovary normally develops into a fruit without pollination and fertilization. This type of free development of fruit is known as parthenocarpy.
  • Such fruits are always seedless.
  • Sometimes these fr…

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Question 187

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Appeared in Year: 2014 (IFS)

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Write brief note on Eutrophication. (Paper 2)

Explanation

Eutrophication

  • Eutrophication means “well-nourished or enriched” . It is a state in which lake/pond get rich nutrient due to continue supply of nutrient into it.
  • It is also occurring as part of the ageing process in lakes, as nutrients accumulate though natural succession.
  • It is a natural process. Eutrophication become excessive when abnormally high a…

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Question 188

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Appeared in Year: 2015 (IFS)

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Which plants are being used as a potential source of future energy? Support your answer in pretext with Indian conditions. (Paper 2)

Explanation

Plants as a Potential Source of Future Energy

  • Inspite of increasing availability of energy, there is always its shortage.
  • The conservation of existing energy resources as well as exploration of alternate resources has been engaging the attention of the world՚s scientific community.
  • The urgency of solving the energy problem has prompted many countries …

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Question 189

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Appeared in Year: 2015 (IFS)

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Plants as source of spices (Paper 2)

Explanation

Plant as Source of Spices

  • There are 70 spices which are cultivated in different parts of the world.
  • The major spices produced by the India are pepper, cardamom, ginger, red chillies, turmeric.
  • India is the largest producer and exporter of the spices and spice products.
  • Some important pant as a source of the spices are-

Ginger

  • Botanical name-Zingiber offi…

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Question 190

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Appeared in Year: 2015 (IFS)

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What are the various method of genetic recombination in bacteria. (Paper 2)

Explanation

Genetic Recombination in Bacteria

  • In bacteria sexual reproduction does not involve fusion of gametes as in other organisms but each heritable character is determined by a portion of its genetic material as in other organism.
  • Interchange of genetic material in bacteria is accomplished either by conjugation or by exotic methods.
  • In conjugation exchange …

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Question 191

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Appeared in Year: 2015 (IFS)

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Role of somatic hybrids in crop improvement. (Paper 2)

Explanation

Role of Somatic Hybrids in Crop Improvement

  • Production of novel inter-specific and inter-generic crosses between plants that are difficult or impossible to hybridise conventionally. it overcome sexual incompatibility barrier.
  • Somatic hybridization for gene transfer for

Disease Resistance

  • The families Solanaceae and Brassiceae contain the most commonly …

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Question 192

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Appeared in Year: 2015 (IFS)

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Write down the botanical names and the uses of the plants of economic importance belonging to the family Cucurbitaceae. (Paper 2)

Explanation

Some Plants of Cucurbitaceae Family with Their Economic Importance

All these species are used provide edible fruits-

Gourd

Botanical name-Luffa cylindrica

Kalitori

Botanical name-Luffa acutangula

Lauki

Botanical name-Lagenaria siceraria

Khira

Botanical name-Cucumis sativus

Melon

Botanical name-Cucumis melo

Phut

Botanical name-Cucumis melo

Kakri

Botanical name-Cuc…

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