IFS (Forests Services) Botany (Mains): Questions 65 - 72 of 160

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Question number: 65

» Phanerogams » Gymnosperms

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

Draw scientifically accurate diagrams of the following and label the parts: Anatomy of Pinus needle (Paper - 1, Section - B)

Explanation

 Image showing Pine needle anatomy.

Image Showing Pine Needle Anatomy.

The Pine or Pinus needle shows xerophytic habitat in which it grows and is internal structure shows various features.

Anatomy of Pinus needle or Pinus leaf:

Epidermis:

  • Single layered, thick walled and cutinized.

  • Stomata are distributed the entire surface of the leaf, so the leaf is described as amphi

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Question number: 66

» Angiosperms » Development of Male and Female Gametophytes

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

Differentiate between Megasporogenesis and megagametogenesis. (Paper - 1, Section - B)

Explanation

Megasporogenesis:

  • The formation and development of megaspores is called Megasporogenesis.

  • The formation of megaspores occurs inside the ovules of seed plants. A diploid cell in the ovule is called megaspore mother cell which is undergoes to the meiosis and form four haploid megaspores.

  • In most plants, out of four only one megaspore dev

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Question number: 67

» Phanerogams » Gnetales

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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

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Question number: 68

» Angiosperms » Systematics

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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 i

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Question number: 69

» Cell Biology » Ribosomes

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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 a dense area within the nuc

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Question number: 70

» Ecology and Plant Geography » Afforestation

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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 for

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Question number: 71

» Ecology and Plant Geography » Pollution & Control

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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 material decomposes and c

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Question number: 72

» Physiology and Biochemistry » Fermentation-Electron Transport Chain

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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 recognized that e

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