IFS (Forests Services) Botany (Mains): Questions 67 - 75 of 124

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Question number: 67

» Phanerogams » Gnetales

Appeared in Year: 2014

Essay Question▾

Describe in Detail

What are the angiospermic features of Gnetum? (Paper - 1, Section - B)

Explanation

  • Gymnosperms have naked-seeds but not fruits or flowers.

  • Gymnosperms developed during the Paleozoic Era and became dominant during the early Mesozoic Era.

  • The presence of companion cells in the angiosperms is one of the constant anatomical features which distinguish gymnosperm with the angiosperm.

  • Gnetum belongs to gymnosperm plants but it

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Question number: 68

» Angiosperms » Systematics

Appeared in Year: 2014

Essay Question▾

Describe in Detail

Write the botanical name, family, active constituents and uses of any five medicinal plants of commercial importance in India. (Paper - 1, Section - B)

Explanation

1. Turmeric (Haldi):

Botanical name: Curcuma longa

Family: Zingiberaceae

Active constituent:

Curcumin (diferuloylmethane) is a polyphenol compound responsible for the bright yellow color of turmeric.

Uses:

  • Use as the blood purifier and is very useful in the common cold, leprosy, affections of the liver, dropsy and wound healing.

  • Used

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Question number: 69

» Cell Biology » Ribosomes

Appeared in Year: 2014

Essay Question▾

Describe in Detail

Explain the following in about 150 words each: Ribosomes are synthesized? (Paper 2 - Section A)

Explanation

  • Ribosome is a complex of ribosomal ribonucleic acid (rRNA) and protein.

  • The rRNA part is synthesized from the original message called DNA in the nucleus, particularly in a region called nucleolus.

  • Molecules of rRNA are synthesized in a specialized region of the cell nucleus called the nucleolus, which appears as

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Question number: 70

» Ecology and Plant Geography » Afforestation

Appeared in Year: 2014

Essay Question▾

Describe in Detail

Describe the differences and importance of afforestation, reforestation and social forestry. (Paper 2, Section B)

Explanation

Differences:

  • Afforestation is the process of establishing forests in areas that have never been forested while reforestation is the restoration of forests in areas where forests were removed or destroyed.
  • Both afforestation and reforestation are the converse of avoiding deforestation.
  • While Social forestry is the forestry by the people and
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Question number: 71

» Ecology and Plant Geography » Pollution & Control

Appeared in Year: 2014

Essay Question▾

Describe in Detail

Write brief notes on the following in about 150 words each: Eutrophication

(Paper 2, Section B)

Explanation

  • Eutrophication is the over-enrichment of water by nutrients (e. g. from chemical fertilizer or sewage) which is causing overgrowth and decay of plants, deoxygenation of water, and the death of its organisms.

  • This enhanced plant growth, often called an algal bloom, reduces dissolved oxygen in the water when dead plant

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Question number: 72

» Physiology and Biochemistry » Fermentation-Electron Transport Chain

Appeared in Year: 2014

Essay Question▾

Describe in Detail

Write brief notes on the following in about 150 words each: Fermentation (Paper 2, Section B)

Explanation

  • Fermentation is a natural process. People applied fermentation to make products such as wine, mead, cheese and beer long before the biochemical process was understood.

  • In the 1850s and 1860s Louis Pasteur became the first scientist to study fermentation when he demonstrated fermentation was caused by living cells.

  • He also

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Question number: 73

» Genetics, Molecular Biology and Evolution » Sex Chromosomes

Appeared in Year: 2014

Essay Question▾

Describe in Detail

What is accounted for by Lyon’s hypothesis? Cite an example. (Paper 2 - Section A)

Explanation

  • The Lyon’s hypothesis was described by Mary Lyon in 1962.

  • The Lyon’s hypothesis does not related to germ cells and explains the phenomenon of heterozygous female carries of X-lined recessive disorders showing features of the condition.

  • The Lyon’s hypothesis was also explains the phenomenon of Barr bodies.

  • The Lyon hypothesis

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Question number: 74

» Ecology and Plant Geography » Endemism

Appeared in Year: 2014

Essay Question▾

Describe in Detail

Write brief notes on the following in about 150 words each: Endemism (Paper 2, Section B)

Explanation

Endemism means the situation in which a species is restricted to a particular geographic region as a result of factors such as isolation or in response to abiotic conditions.

  • Endemic species is only found in a given region or location and nowhere else in the world. If they are extinct

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Question number: 75

» Physiology and Biochemistry » Secondary Metabolites

Appeared in Year: 2014

Essay Question▾

Describe in Detail

Describe various structural and chemical defence mechanisms developed by plants. (Paper 2, Section B)

Explanation

  • Plants need to protect themselves from various threats.
  • So, some plants have modified parts that are used for defence.
  • These defense mechanisms are used to protect plants from herbivorous animals and insects and also from insects laying eggs on the plant.

Structural Defense Mechanisms

Microscopy visible structural characteristics present on

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