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Characteristics of Seed Plants and Gymnosperms

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Characteristics of Seed Plants and Gymnosperms

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Questions and Answers

What is the location of female cones on a gymnosperm tree?

On the upper branches (correct)

On the roots

On the trunk

On the lower branches

What is the function of the integument in a gymnosperm ovule?

It surrounds the nucellus (correct)

It protects the seed from predators

It facilitates fertilization

It produces pollen

How many megaspores are produced by meiosis in a gymnosperm megasporangium?

Eight

One (correct)

Four

Two

What is the fate of three of the four cells produced by meiosis in a gymnosperm megasporangium?

They degenerate Signup and view all the answers

What is the purpose of the micropyle in a gymnosperm ovule?

It allows pollen to enter Signup and view all the answers

How long does it take for a megagametophyte to develop in a gymnosperm?

One year Signup and view all the answers

What is the number of archegonia typically found at the micropylar end of the megagametophyte?

2-6 Signup and view all the answers

What is the function of the sticky fluid in the micropyle?

To allow pollen into the ovule Signup and view all the answers

What is the time span between pollination and fertilization in gymnosperms?

About 15 months Signup and view all the answers

What is the equivalent of the stigma in flowering plants in gymnosperms?

Absent Signup and view all the answers

What is the fate of the extra sperm nucleus during fertilization in gymnosperms?

It degenerates Signup and view all the answers

What is the function of the microsporangia in the male cones of gymnosperms?

To produce the microspores Signup and view all the answers

What is the characteristic of the male sex cells in seed plants?

They are transported to the female sex cells by wind or animals Signup and view all the answers

What is the difference between gymnosperm and angiosperm seeds in terms of fertilization?

Gymnosperm seeds are produced from single fertilization, while angiosperm seeds are produced from double fertilization Signup and view all the answers

What is the term for the fertilized ovule?

Seed Signup and view all the answers

What is the significance of the growth of the embryo within a megasporangium?

It allows the embryo to exist in a state of dormancy for various durations Signup and view all the answers

What is the role of the two sperm nuclei produced during meiosis?

They are involved in double fertilization Signup and view all the answers

What is the function of the integuments in ovule development?

They cover the megasporangium Signup and view all the answers