Microbiology and Plant Pathology [IFS (Forests Services) Botany (Mains)]: Questions 9 - 17 of 37

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Question number: 9

» Microbiology and Plant Pathology » Viruses

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Appeared in Year: 2013

Essay Question▾

Describe in Detail

Write a brief account of the following: Lytic and Lysogenic cycle (Paper 1, Section A)

Explanation

Lytic and lysogenic cycles are two different methods of viral replication.

While they are different, they can be interchangeable or the replication can involve both methods in separate phases.

  • The Lytic Cycle:

  • In the lytic cycle, which is considered the main cycle in viral replication, once the viral DNA enters the cell it transcribes itself into the

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Question number: 10

» Microbiology and Plant Pathology » Applications

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Appeared in Year: 2013

Essay Question▾

Describe in Detail

Discuss briefly the following: Biopesticides (Paper 1, Section A)

Explanation

  • Biopesticides are certain types of pesticides derived from such natural materials as animals, plants, bacteria, and certain minerals.

  • Biopesticides are those biological agents that are used for control of weeds, insects and pathogens.

  • The micro-organisms used as biopesticides are viruses, bacteria, protozoa, fungi and mites.

Classes of Biopesticides:

  • B

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Question number: 11

» Microbiology and Plant Pathology » Major Plant Diseases

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Appeared in Year: 2013

Essay Question▾

Describe in Detail

Discuss briefly the following: Causal organisms, symptoms and control of wheat rusts in India (Paper 1, Section A)

Explanation

Three types of wheat rusts are known and all of them frequently occur in India.

  1. Black or stem rust

  2. Orange – Brown rust

  3. Yellow stripe rust

Black or stem rust:

Causal organism: Puccinia graminis tritici

Symptoms:

  • Symptoms are produced on almost all aerial parts of the wheat plant but are most common on stem, leaf sheaths and upper and lower leaf surfaces.

  • Pu

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Question number: 12

» Microbiology and Plant Pathology » Major Plant Diseases

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Appeared in Year: 2013

Essay Question▾

Describe in Detail

Discuss briefly the following: Dissemination of pathogens by insects (Paper 1, Section A)

Explanation

  • Since the discovery by Waite that bees and wasps can transmit bacteria causing fire blight of apple and pear, Erwinia amylovora, much information has been accumulated on the role of insects and other small animals in the dissemination of plant-pathogenic viruses, bacteria and fungi.

  • Many small animals help in the dissemination of some pathogens occa

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Question number: 13

» Microbiology and Plant Pathology » Viruses

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

What is meant by modelling and how does it help in disease forecasting?

Explanation

Modelling

  • Modelling is a significant task of systematic biology. Modelling is significant task to make forecasting models.

  • It aims to develop and use efficient algorithms, data, and structure, visluization and communication tools with the goal of computer model of biology systems.

  • It involve in disease forcasting. now let us know disease forecasting b

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Question number: 14

» Microbiology and Plant Pathology » Physiology of Parasitism & Control

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

Citing suitable examples, explain how laxity is quarantine procedure can have disastrous effects.

Explanation

  • Plant quarantine is a type of prophylactic measure.

  • The prophylactic measure is preventive and includes protection of the host from exposure to the pathogen from infection or from environmental factors favourable to disease development.

  • Plant quarantine is a legal restriction to the national or international level on the trade of propagating material

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Question number: 15

» Microbiology and Plant Pathology » Viruses

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

Differentiate between Isotype and Syntype.

Explanation

  • Plant name publication and designation of type of specimens follows the rules developed at the international botanical congress current rules.

  • International code of nomenclature for algae, fungi, and plants require that a single type specimen be designated at the time of publication (holotype).

  • Duplicates of the specimen with the same collector and n

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Question number: 16

» Microbiology and Plant Pathology » Viruses

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

Differentiate between Palaeozoic and Cenozoic plants.

Explanation

Types of plant found in Palaeozoic ERA and Cenozoic Era

Palaeozoic era

  • The vegetation is both aquatic and land plants.

  • Aquatic plants like Nematothallus and prototaxites showed resemblance with thallophytes. The first Fossil of land plants were found in the Silurian and Devonian period of this era.

  • Manograptus, sporogonites, zosterophyllum, cooksonia,

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Question number: 17

» Microbiology and Plant Pathology » Basis of Infection

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

Explain the molecular basis of plant –pathogen interaction.

Explanation

  • 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.

  • The plant is affected by the pathogen whereas p

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