Angiosperms-Embryology [IFS (Forests Services) Botany (Mains)]: Questions 1 - 5 of 5

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Question number: 1

» Angiosperms » Embryology

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Appeared in Year: 2013

Short Answer Question▾

Write in Short

Draw scientifically accurate diagrams of the following and label the parts: Typical embryo sac of dicots (Paper 1, Section B)

Question number: 2

» Angiosperms » Embryology

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

Comment on Plumbago type of embryo sac development.

Explanation

Plumbago is a type of tetrasporic embryo sacs

In some plants miotic division of the megaspore mother cell is not accompanied by cytokinesis and hence all four haploid nuclei are present in single cell and called coeno-megaspore.

  • All the four nuclei of coeno-megaspore participate in the formation of embryo sac.

  • This type of embryo sacs are called tetra

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Question number: 3

» Angiosperms » Embryology

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

Differentiate megasporangenesis and mega gametogenesis.

Explanation

Megasporogenesis and mega gametogenesis

  • Megasporogenesis and mega gametogenesis is a very important process in angiosperms.

  • The ovule develops as multicellular Placenta outgrowth. In further development nucleus and one or two integuments are formed.

  • Hypodermal cell of nucleus become differentiated from the other and that’s call archesporial.

  • Archespora

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Question number: 4

» Angiosperms » Embryology

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Appeared in Year: 2015

Essay Question▾

Describe in Detail

Allium type of embryo sac (Paper 2)

Explanation

  • Allium is a bisporic type of embryo sac

  • In this type of embryo sac megaspore mother cell divides to form two cells, the upper one quickly degenrates.

  • The lower one then divides and forms two nuclei, and they are distribute in the two poles.

  • Later on both the nuclei undergo two successive divisions and form usual octant type of embryo sac. That is call

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Question number: 5

» Angiosperms » Embryology

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Appeared in Year: 2016

Essay Question▾

Describe in Detail

Describe the various stages of development of exine of pollen wall. Add a note on the importance of sporopollenin.

Explanation

  • The pollen wall formation is discussed under two models, viz. the primexine model and the undulation model.

  • In 1972 Christensen explains these steps in the development of pollen wall exine.

  • In the tetrad stage new wall get deposited around the microspore protoplast within the wall of callose that wall is called primexine the primexine contain cellulo

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