IFS (Forests Services) Botany (Mains): Questions 90 - 97 of 160

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Question number: 90

» Morphogenesis » Somatic Hybrids

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Appeared in Year: 2013

Essay Question▾

Describe in Detail

Differentiate between Somatic embryogenesis and Organogenesis (Paper 1, Section B)

Explanation

Somatic embryogenesis:

  • In plant tissue culture, the developmental pathway of numerous well organized, small embryoids resembling the zygotic embryos from the embryo genic potential somatic plant cell of the callus tissue or cells of suspension culture is known as somatic embryogenesis.

  • Somatic embryogenesis is the process by which embryo f

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Question number: 91

» Angiosperms » Embryology

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Appeared in Year: 2013

Short Answer Question▾

Write in Short

Draw scientifically accurate diagrams of the following and label the parts: Typical embryo sac of dicots (Paper 1, Section B)

Question number: 92

» Phanerogams » Cycadales

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Appeared in Year: 2013

Essay Question▾

Describe in Detail

Write short notes on the following: Cycadofilicales (Paper 1, Section B)

Explanation

  • Cycadofilicales is an order of fossil gymnosperms trees or climbing plants from the Devonian.

  • They possessed characteristics of both the ferns and the seed plants that had fern like leaves and reproduced by means of seeds.

  • In Cycadofilicales order, absence of roots, some are without leaves and some have small tiny outgrowth which is rep

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Question number: 93

» Phanerogams » Gymnosperms

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Appeared in Year: 2013

Essay Question▾

Describe in Detail

Write brief and critical notes on the following: Manoxylic and Pycnoxylic wood (Paper 1, Section B)

Explanation

The secondary wood in the gymnosperms may be manoxylic or pycnoxylic.

Manoxylic wood:

  • Manoxylic wood is soft and parenchymatous.

  • Manoxylic wood is not commercially useful.

  • Manoxylic wood is the non-compact wood with large pith and cortex mixed with less amount of xylem tracheids or wood.

  • Parenchyma cells are filled with starch gra

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Question number: 94

» Angiosperms » Systematics

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Appeared in Year: 2013

One Liner Question▾

Write in Brief

Write the botanical name, family and part used of each of the following: Clove (Paper 1, Section B)

Question number: 95

» Cryptogams » Fungi

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Appeared in Year: 2013

Essay Question▾

Describe in Detail

Discuss the following briefly: Explain the role of arbuscular mycorrhizal fungi as biofertilizer (Paper 1, Section A)

Explanation

  • Biofertilizers are the organic substances which make use of microorganisms to increase the fertility of soil. These fertilizers are not harmful to crops or other plants like the chemical fertilizers. They are actually taken from the animal wastes along with the microbial mixtures.

  • Arbuscular mycorrhizal (AM) fungi have the economic benefits

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Question number: 96

» Microbiology and Plant Pathology » Physiology of Parasitism & Control

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Appeared in Year: 2013

Essay Question▾

Describe in Detail

Write short note on the following: Soil solarization and its use to control nematodes in soil (Paper 1, Section A)

Explanation

Defining soil solarization:

  • Soil solarization is a hydrothermal process which occurs in moist soil when covered by plastic film and heated by exposure to sunlight during the warm months.

  • The process changes physical, chemical, and biological properties and thereby improves soil health.

  • Soil solarization is a nonchemical method for cont

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Question number: 97

» Cryptogams » Pteridophytes

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Appeared in Year: 2013

Essay Question▾

Describe in Detail

Discuss briefly the following: Morphological nature of sporocarp of Marsilea (Paper 1, Section A)

Explanation

Morphological nature of sporocarp has been controversial and atleast two different hypotheses have been proposed.

A) Leaf segment hypothesis or laminar hypothesis

  • According to this hypothesis the sporocarp is homologous with a modified, lateral fertile segment of the leaf. This theory has been supported by a large number of scientists Russow,

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