IFS (Forests Services) Botany (Mains): Questions 95 - 101 of 287

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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 of agric

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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 controlling soil bor

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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, Busgen,

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Question number: 98

» 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: Belladona (Paper 1, Section B)

Question number: 99

» Cryptogams » Algae

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Appeared in Year: 2013

Essay Question▾

Describe in Detail

Write about the following: Algae as Bio-fertilizer (Paper 1, Section A)

Explanation

  • Blue green algae (BGA) are photoautotrophic, prokaryotic algae. They are free living and also known as cyanobacteria. It fixes the atmospheric nitrogen in moist soils. So BGA has been recommended as a Biofertilizer.

  • Biofertilizers are organisms that enrich the nutrient quality of soil.

  • Main sources of biofertilizers are bacteria, fungi, and cyanobact

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Question number: 100

» 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: Finger millet (Paper 1, Section B)

Question number: 101

» Angiosperms » Magnoliaceae

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Appeared in Year: 2013

Essay Question▾

Describe in Detail

Comment on the following: Magnoliaceae – Primitive characters (Paper 1, Section B)

Explanation

  • Primitive characters:

  • Large flowers with numerous petals and sepals (called tepals because they are similar in size and shape).

  • The elongated floral axis bearing several free perianth segments, usually spirally arranged, the numerous stamens and carpels.

  • Radially symmetrical flower.

  • Alternative and simple leaves.

  • Cone-like appearance of the fruiting str

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