Optionals IAS Mains Botany: Questions 146 - 154 of 422

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Question 146

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Appeared in Year: 2014

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Essay▾

What are the xerophytic and hydrophytes characters found in the Rhizome anatomy of Equisetum?

Explanation

Rhizome Anatomy of Equisetum

  • The sporophyte of equisetum is divided into three part stem, root, and leaves.
  • The main stem is underground creeping and perennial rhizome. That is differentiated into nodes and inter-nodes.

Xerophytic Character

  • Presence of ridges and grooves.
  • The outer and radial walls of epidermal cells are impregnated with silica.
  • Presence

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Question 147

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Appeared in Year: 2014

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Write notes on the distribution of bryophytes and pteridophytes in deciduous and evergreen forests of india.

Explanation

In India most of the land is covered with evergreen or deciduous forest. hence in most of the area bryophytes and teridophytes are found.

Distribution of Pteridophytes

  • Variable climate and altitude variation and due to this evergreen forest and deciduous forest are found all over the sub continent of India.
  • These forest are found in Himalayas, Gangeti

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Question 148

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Appeared in Year: 2014

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Essay▾

Differentiate between normal and abnormal secondary growth in dicot stem. Discuss with diagram whenever necessary.

Explanation

Dicot System

In most of the dicot stems after differentiation of primary tissue they increase in breadth by secondary growth. This growth is due to the activity of lateral Meristems

  • The vascular cambium and phellogen or cork cambium
  • The vascular cambium differentiate into the stelar is and secondary xylem and secondary phloem. The phellogen on the oth

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Question 149

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Appeared in Year: 2014

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Essay▾

Comment on stratification of pollen grain walls.

Explanation

Pollen Grains (Male Gametophyte Mother Cell) or Microspore

  • During gametogenesis the nucleus of pollen grain divides into a small lenticular generative cell and large vegetative cell.
  • The generator cell again divides and to form two male gametes and hence Pollen Grain is called the male gametophyte of plant.

Stratification of Pollen Grain

  • Pollen Grain h

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Question 150

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Appeared in Year: 2014

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Essay▾

Comment on contractile vacuoles in euglena.

Explanation

Contractile Vacuoles in Euglena

  • Contractile vacuole is vacuole type which expands and contract according to water availability inside the sell.
  • Its function is to regulate water concentration inside the cell.
  • A single cell organism lacking cell wall have contractile type of vacuole, which expand and contract itself to remove extra water from organism.

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Question 151

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Appeared in Year: 2014

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Differentiate between Isotype and Syntype.

Explanation

Isotype and Syntype

  • Plant name publication and designation of type of specimens follows the rules developed at the international botanical congress current rules.
  • International code of nomenclature for algae, fungi, and plants require that a single type specimen be designated at the time of publication (holotype).
  • Duplicates of the specimen with the s

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Question 152

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Appeared in Year: 2014

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Explain to what extent has the technique of Micropropagation been successful in achieving our goals.

Explanation

Micropropagation Technique

  • The techniques of Micropropagation has been successful in achieving our goals upto very long extent some of the examples are that Micropropagation techniques are now after preferred to conventional practices of a sexual propagation because of the given reasons not only for commercial point of you but also with regard to cr

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Question 153

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Appeared in Year: 2014

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Differentiate between Palaeozoic and Cenozoic plants.

Explanation

Types of plant found in Palaeozoic ERA and Cenozoic Era

Palaeozoic Era

  • The vegetation is both aquatic and land plants.
  • Aquatic plants like Nematothallus and prototaxites showed resemblance with thallophytes. The first Fossil of land plants were found in the Silurian and Devonian period of this era.
  • Manograptus, sporogonites, zosterophyllum, cooksonia,

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Question 154

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Appeared in Year: 2014

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Essay▾

Floral formula diagram of Ranunculaceae and Rosaceae.

Explanation

In ranunculaceae family there are generally three type of floral structure are seen. They are ranunculus, delphinium, clematis. Some examples are Butter cup, Larkspur, Virgins-bower.

Ranunculacese

Image shows Ranunculacese

Image Shows Ranunculacese

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Delphinium

Image shows Delphinium

Image Shows Delphinium

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Clematis

Image shows Clematis

Image Shows Clematis

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Rosaceae

In Rosaceae fa

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