Angiosperms-Polyembryony [IFS (Forest Services) Botany]: Questions 1 - 6 of 6

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Question 1

Appeared in Year: 2015

Describe in Detail Subjective▾

Write a brief and critical note on polyembryony and give its importance. (Paper 1, Section B)

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Explanation

Polyembryony

  • Polyembryony is the process in which the fertilization of single egg leads to the formation of two or more embryos.
  • Polyembryony is common in mango and citrus.

Importance

  • It is importance in the formation of identical twins.
  • Formation of embryos by cells of the embryo sac other than the egg and embryo develop from additional embryo sacs in …

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Question 2

Appeared in Year: 2015

Describe in Detail Subjective▾

Write a brief and critical note on polyembryony and give its importance. (Paper 2)

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Explanation

Polyembryony

  • After the fertilization, the ovules mature into the seeds. In a normal situation one embryo is present in the each seed. But sometimes more than one embryo is present in a seed. This condition is called polyembryony.
  • In nature there are some plants which have more than one embryo in a seed. In this type of plants only one embryo matures …

… (173 more words) …

Question 3

Appeared in Year: 2017

Describe in Detail Subjective▾

Distinguish between simple and cleavage polyembryony with the help of labelled diagrams; compare the embryogeny of pinus and Cycas.

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Explanation

Polyembryony

  • The presence of more than one embryo in the seed is called polyembryony.
  • But even in polyembryony only one embryo matures and rest of them degenerate.

Simple Polyembryony

In simple polyembryony many embryos develops as a result of the fertilization of several archegonia.

Cleavage Polyembryony

  • It is most common method of development of more t…

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Question 4

Appeared in Year: 2017 (IAS)

Describe in Detail Subjective▾

Comment on polyembryony and apomixis in flowering plants.

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Explanation

The development of more than one embryo in one ovule, seed or fertilized ovum is called polyembryony. It occurs in both animals as well as plants.

  • In plants, this phenomenon was first reported by Antoni van Leeuwenhoek (1719) in orange seeds. In several gymnosperms, the polyembryony is so common that it might be regarded as an important character of…

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Question 5

Appeared in Year: 2020 (IAS)

Describe in Detail Subjective▾

Describe the following in about 150 words each:

Classification and importance of Polyembryony.

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Explanation

The development of more than one embryo in a single ovule, seed, or by complete cleavage of a fertilized ovum is referred to as polyembryony. As a result, supernumeraries of various frequencies emerge, including duplet, triplet, quadruplet, quintuplet, sextuplet, and so on. Because of polyembryony, humans have identical twins. It is present in both…

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Question 6

Appeared in Year: 2022

Describe in Detail Subjective▾

Define polyembryony. What are the various ways in which it may arise in angiosperms? State the practical value of polyembryony. (Paper-1)

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Explanation

Definition

Polyembryony is the formation of many embryos in a single ovule, seed, or fertilized ovum. It may be found in both animals and plants. Polyembryony is most visible in some species, such as parasitic Hymenoptera, where up to 2,000 embryos can develop from a single zygote. This phenomenon was initially seen in plants by Antoni van Leeuwenho…

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