IAS (Admin.) Mains Botany: Questions 310 - 318 of 1252
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Question 310
Appeared in Year: 2016 (IFS)
Write in Short Short Answer▾
Discuss the roles of different hormones and enzymes involved in seed germination.
EditQuestion 311
Appeared in Year: 2016 (IFS)
Describe in Detail Subjective▾
Describe different methods of gene transfer in plants. Explain the advantages and disadvantages of transgenic plants.
EditExplanation
Gene Transfer in Plants
- There is different method of gene transfer in plants-
- Vector mediated transfer method
- Agrobacterium
- Virus mediated transfer method
- Caulimoviruses
- Gemini viruses
- RNA viruses
- Vectors that are used for transfer of the genes in the plants are RNA and DNA based.
- In vectors based on T-DNA the vector DNA translocate into the nucleus and int…
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Question 312
Appeared in Year: 2016 (IFS)
Describe in Detail Subjective▾
Discuss the role of phytoremediation in the treatment of heavy metal polluted soil. Explain the bioremediation of hydrocarbon.
EditExplanation
Role of Phytoremediation in the Treatment of Heavy Metal Polluted Soil
- The capacity of plants to sequester heavy metal ions by binding them to phytochelatin used to detoxify soils polluted with heavy metals.
- On such soils plants are grown, which by breeding or genetic engineering have a particularly high capacity for heavy metal uptake by the roots a…
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Question 313
Appeared in Year: 2017 (IFS)
Describe in Detail Subjective▾
Discuss in brief the distinctive flora of the Mesozoic Era.
EditExplanation
Distinctive Flora of the Mesozoic Era
- On the basis of Geological time scale Mesozoic era is divided into three period named Triassic, Jurassic and Cretaceous.
- They all have different kind of flora present in different period of time.
Triassic
- Triassic period is arid and that՚s why plant which support arid environment grow faster in this period.
- Presence…
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Question 314
Appeared in Year: 2017 (IFS)
Describe in Detail Subjective▾
Significance of accessory chromosomes.
EditExplanation
Accessory Chromosomes
- Chromosome that is additional to the regular karyotype of a species is called accessory chromosome.
- It is also known as B chromosome and supernumerary chromosome.
- It may or may not found in organism.
- Mostly they are non-coding hetero-chromatic chromosome but certain some euchromatic segments.
- Some they are said selfish genetic elem…
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Question 315
Appeared in Year: 2017 (IFS)
Describe in Detail Subjective▾
Describe the role of phytohormones in agri- horticulture.
EditExplanation
Different Role of Different Phytohormone in Agri-Horticulture
Auxin
- Propagation
- Stimulation of fruit set
- Chemical thinning
- Prevent fruit drop
- Herbicidal action
Gibberellins
- Increase fruit size in grape.
- Stimulate fruit set.
- Effect fruit ripening.
- Increase yield in sugarcane.
- Malting of barley.
- Controlling flower bud production.
- Overcome environmental constraints…
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Question 316
Appeared in Year: 2017 (IFS)
Describe in Detail Subjective▾
Describe the molecular basis of plant-pathogen interaction, with examples.
EditExplanation
Molecular Basis of Plant-Pathogen Interaction
- During the contact between plants and pathogen a particular chain of events happen in the plant,
- The plant is provided by receptor that interacts with bacterial protein; as a result quick protective reaction is being developed.
- The protein of pathogenic organism are virulent for the given plant genotype.
- Th…
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Question 317
Appeared in Year: 2017 (IFS)
Describe in Detail Subjective▾
Callus culture: origin and application.
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Callus Culture
- Culture of a differentiated tissue from ex-plant allowed dedifferentiating in vitro and that is called callus tissue.
Origin
- R. J. Gautheret first succeeded in development of callus tissue from excised cambial tissue of Salix capraea.
- He grew the callus by using simple nutrient medium.
- P. nobecourt established the callus culture capable o…
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Question 318
Appeared in Year: 2017 (IFS)
Write in Short Short Answer▾
Give the concept on the inflorescence of Musaceae.
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