IFS Botany (Mains): Questions 59 - 66 of 124

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Question number: 59

» Angiosperms » Pollination an Fertilization

Appeared in Year: 2014

Essay Question▾

Describe in Detail

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

Explanation

  • 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… (261 more words) …

Question number: 60

» Angiosperms » Development of Male and Female Gametophytes

Appeared in Year: 2014

Essay Question▾

Describe in Detail

Stages depicting the formation of vegetative and generative cells during male gametophyte development in angiosperms (Paper - 1, Section - B)

Explanation

  • Development of male gametophyte starts in pollen grains.

  • Microspore undergoes mitotic divisions and forms two unequal cells; vegetative cell and generative cell.

  • The larger cell is called vegetative cell and the smaller cell is called generative cell or germinative cell.

  • Vegetative cell is also called as tube cell.

  • Vegetative cell… (322 more words) …

Question number: 61

» Angiosperms » Patterns of Embryo Development

Appeared in Year: 2014

Essay Question▾

Describe in Detail

Comment on Plumbago type of embryo sac development. (Paper - 1, Section - B)

Explanation

Tetrasporic Embryosac:

  • It is formed by all four megaspore nuclei because meiosis is not accompanied by Cytokinesis, so that four nuclei of megaspores are formed.

  • All four nuclei are collectively known as “Coenomegaspore”.

  • Generally all the four Nuclei of megaspores take part in the formation of the seven celled and… (102 more words) …

Question number: 62

» Phanerogams » Gymnosperms

Appeared in Year: 2014

Essay Question▾

Describe in Detail

Why are gymnosperms called naked-seeded plants? (Paper - 1, Section - B)

Explanation

  • Gymnosperms do not produce fruit, their seeds are naked or exposed to the elements without a layer of fruit to protect them.

  • Gymnosperms are different from angiosperms on the basis of the naked-seed habit and enclosure of seeds within a fruit in the latter.

  • Gymnosperm pollen lands directly on the… (156 more words) …

Question number: 63

» Cryptogams » Bryophytes

Appeared in Year: 2014

Essay Question▾

Describe in Detail

Draw scientifically accurate diagrams of the following and label the parts: L. S. of capsule of Funaria (Paper - 1, Section - B)

Explanation

Image showing L.S. of capsule of Funaria

Image Showing L. S. Of Capsule of Funaria

Capsule is a part of sporophyte and the sporophyte in Funaria is called as sporogonium and is green in colour while is young and become reddish brown at mature.

Funaria capsule:

  • A mature sporogonium or sporophyte of Funaria is borne at the… (191 more words) …

Question number: 64

» Angiosperms » Ranunculaceae

Appeared in Year: 2014

Essay Question▾

Describe in Detail

Draw scientifically accurate diagrams of the following and label the parts: Floral formula and floral diagram of Ranunculaceae and Rosaceae (Paper - 1, Section - B)

Explanation

Ranunculaceae:

 Image showing floral formula & floral diagram of Ranunculaceae

Image Showing Floral Formula & Floral Diagram of Ranunculaceae

There is 5 calyx and 5 corolla is present which are free, stamens are numerous, carpels are numerous and flower is bisexual.

Rosaceae:

Image showing floral formula and diagram of Rosaceae family

Image Showing Floral Formula and Diagram of Rosaceae Family

In Rosaceae family, flowers are actinomorphic, 5 free… (15 more words) …

Question number: 65

» Phanerogams » Gymnosperms

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… (262 more words) …

Question number: 66

» Angiosperms » Development of Male and Female Gametophytes

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… (268 more words) …

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