BIOL 102 EXAM 2 Essay Question #4

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What then happens to the ovule?

It becomes a seed which then becomes a fruit

What happens to the microspores?

They become pollen grains with a sperm nucleus

What do microsporocytes produce and how?

4 haploid microspores through meiosis

What do the microsporocytes of a flowering plant produce and how?

4 haploid microspores through meiosis

What happens to the 4 haploid megaspores?

3 degenerate by random and the 4th one goes through mitosis to produce two diploid egg nuclei.

What do megasporocytes produce and how?

4 haploid megaspores through meiosis

What does each megasporangia contain?

A diploid megasporocyte

What do microspores develop into?

A single haploid pollen grain with non-flagellated sperm & nucleus

What results from triple fusion?

A triploid endosperm for food storage

What is the result of a sperm fertilizing an egg?

Diploid zygote

What do the microsporangia of a flowering plant possess?

Hundreds of diploid microsprocytes

What happens to the sperm nucleus?

It goes through mitosis to produce two sperm nuclei

What happens to the seed of a conifer?

It is eventually released from the cone, lands, and germinates to become a pine seedling

What do anthers possess?

Microsporangia

What exist inside a staminate cone?

Numerous microsporangia cavities containing hundreds of diploid microsporocytes

What are the two sperm nuclei used for?

One for fertilization and the other is saved for triple fusion

What are the two egg nuclei used for?

One is used for fertilization and the other is used for food storage

What do ovulate cones possess?

Ovule cones that have numerous diploid megasporocytes

What happens to the seeds?

They are eaten by animals and are either left behind or excreted and germinate

How do pollen grains get sperm into the ovule?

They inject a tube into the style of a flower, where they find their way to an ovule

How do pollen grains get from a staminate cone to an ovulate cone?

Wind

What happens when an ovule becomes fertilized?

becomes a diploid zygote

What happens to the 4 haploid megaspores?

3 degenerate by random, and the 4th one goes through mitosis three times to produce 8 egg nuclei

What does the megasporocyte produce and how?

4 haploid megaspores through meiosis.

How does pollen get to an ovary for flowering plants?

It is transferred to the stigma of a flower by an animal

How does the sperm get to an egg?

The pollen grain inserts a tube at the base of an ovule, injecting its sperm & eventually fertilizing an egg

The ovule then becomes a

seed

What are the cones of a pine called?

Staminate and ovulate cones

What are the 8 egg nuclei used for?

Only one is used for fertilization, 2 are synergyds that help the sperm find the egg, 3 are antipodal cells with unknown functions, and the last two are polar nuclei saved for triple fusion later on.

What do ovaries of flowering plants possess?

Megasporangia


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