Double Fertilization in Flowering Plants
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Questions and Answers

What does the first male gamete fuse with during double fertilization?

  • The primary endosperm nucleus
  • The synergid
  • The egg cell nucleus (correct)
  • The zygote

What is the result of the fusion of the second male gamete with the two polar nuclei?

  • Creation of new male gametes
  • Development of the endosperm
  • Formation of the zygote
  • Formation of a triploid primary endosperm nucleus (correct)

What is the diploid cell formed after the fusion of the first male gamete called?

  • Proembryo
  • Endosperm
  • Synergid
  • Zygote (correct)

In what sequence do the events of development occur after double fertilization?

<p>Endosperm development occurs before embryo development (B)</p> Signup and view all the answers

What is the role of the endosperm in a developing seed?

<p>To nourish the developing embryo (D)</p> Signup and view all the answers

What does the central cell become after triple fusion?

<p>The primary endosperm cell (PEC) (A)</p> Signup and view all the answers

What type of embryo development do dicots typically go through?

<p>Proembryo and mature embryo development (C)</p> Signup and view all the answers

What term describes the overall process including endosperm, embryo, seed, and fruit development after fertilization?

<p>Post-fertilization events (C)</p> Signup and view all the answers

Which structure develops into the endosperm after the triple fusion?

<p>The primary endosperm nucleus (PEN) (A)</p> Signup and view all the answers

What is unique about the process of double fertilization in flowering plants?

<p>It involves two separate fusion events. (C)</p> Signup and view all the answers

Flashcards

Double Fertilization

A unique process in flowering plants where two fusions occur within the embryo sac: syngamy (fusion of male gamete with egg cell) and triple fusion (fusion of male gamete with two polar nuclei).

Syngamy

The fusion of a male gamete (sperm) with the egg cell, resulting in the formation of a diploid zygote.

Triple Fusion

The fusion of a male gamete with two polar nuclei located in the central cell, forming a triploid primary endosperm nucleus (PEN).

Primary Endosperm Nucleus (PEN)

A triploid nucleus formed through triple fusion, which will eventually develop into the endosperm.

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Endosperm

The nutritive tissue that surrounds and nourishes the developing embryo within the seed.

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Primary Endosperm Cell (PEC)

The cell that forms after triple fusion and will develop into the endosperm.

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Zygote

The first cell of a new plant embryo, formed by the fusion of an egg cell and a sperm cell.

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Post-Fertilization Events

The events that occur after double fertilization, including endosperm and embryo development, ovule maturation into seeds, and ovary maturation into fruit.

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Embryo Development

The process of a zygote developing into a mature embryo with specialized structures like cotyledons, radicle, and plumule.

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Cotyledons

Seed leaves that provide nutrients to the developing embryo in dicots.

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