Optionals IAS Mains Botany: Questions 52 - 59 of 511

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Question 52

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Appeared in Year: 2014 (IFS)

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Essay▾

Comment on the structure, location and function of transfusion tissue. (Paper A Section A)

Explanation

Transfusion Tissue

  • Transfusion tissue is lying on the vascular bundles of gymnosperm leaves and consists of both living cells like those of parenchyma with walls that are not lignified and thin-walled but lignified tracheids with bordered pits.
  • Transfusion tissue is composed of tracheids with bordered pits and parenchyma cells containing tannin-like …

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Question 53

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Appeared in Year: 2014 (IFS)

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Essay▾

Comment on the contractile vacuoles in Euglena. (Paper A Section A)

Explanation

Contractile Vacuoles

  • Contractile vacuole is a single vacuole and osmotically collected water and then is reformed by a progressive clotting of smaller vacuoles.
  • Contractile vacuoles protect a cell from absorbing too much water and potentially exploding by excreting excess water.

Contractile Vacuoles in Euglena

  • Euglena is single celled organisms lacking…

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Question 54

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Appeared in Year: 2015 (IFS)

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Essay▾

Write brief notes on: “Tricarboxylic acid cycle is an amphibolic process.” Explain. (Paper 2, Section B)

Explanation

Tricarboxylic Acid Cycle

  • Tricarboxylic acid cycle (TCA) is also called as Citric acid cycle or Kreb՚s cycle.
  • Amphibolic pathway is a biochemical pathway that serves both anabolic and catabolic processes. An important example of an amphibolic pathway is the Krebs cycle, which involves both the catabolism of carbohydrates and fatty acids and the synthe…

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Question 55

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Appeared in Year: 2015 (IFS)

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Essay▾

Write brief notes on: What is ‘triple response growth’ ? How is it induced? (Paper 2, Section B)

Explanation

Triple Response Growth

  • Triple response caused by the plant hormone ethylene and plant has a decrease in longitudinal growth and a switch to horizontal growth.
  • Ethylene removes this auxin imbalance and helps the seedling to grow properly.

How Triple Response is Induced

  • Ethylene is a phytohormone or hormone which is produced in the plant under the condit…

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Question 56

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Appeared in Year: 2014 (IFS)

Write in Short

Short Answer▾

Write a brief note on the advantage of diploid carposporophyte generation in red algae. (Paper A Section A)

Question 57

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Appeared in Year: 2014 (IFS)

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Essay▾

Differentiate between Isotype and Syntype. (Paper - 1, Section - B)

Explanation

Isotype

  • A duplicate specimen of the holotype is called isotype and it is always a specimen.
  • An isotype is a biological specimen duplicate of the holotype collected in the same place and at the same time and by the same person.
  • Sometimes the collection number is also the same and differentiated as a, b, c, etc.
  • In fossil plants it can only be applied wh…

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Question 58

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Appeared in Year: 2014 (IFS)

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Essay▾

What are unique features of Brassicaceae? (Paper - 1, Section - B)

Explanation

Unique Features of Brassicaceae

Habit

Usually annual or perennial herbs.

Root

Taproot system.

Stem

Herbaceous, erect and branched.

Leaves

Simple, alternate, radical, usually entire, deeply lobed and pinnatifid (pinnately divided) .

Flowers

Bisexual, heterochlamydeous, actinomorphic and without subtending bracts (ebracteate) .

Calyx

4 sepals, polysepalous and i…

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Question 59

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Appeared in Year: 2014 (IFS)

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Essay▾

Comment on the Stratification of pollen grain walls. (Paper - 1, Section - B)

Explanation

Stratification of Pollen Grain Walls

  • Pollen is micro gametophytes of seed plants which produce the male gametes or sperm cells.
  • Pollen grains have a hard coat that protects the male gametes during the process of their movement between the stamens to the pistil of flowering plants or from the male cone to the female cone of coniferous plants.
  • When poll…

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