Structure Of Mature Pollen Grain Flashcards Preview

Biology: 39 - Sexual Reproduction In Flowering Plants > Structure Of Mature Pollen Grain > Flashcards

Flashcards in Structure Of Mature Pollen Grain Deck (13)
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1
Q

What is the exine?

A

The thick outer wall of the pollen grain

2
Q

What is the thick outer wall of the pollen grain called?

A

The exine

3
Q

Describe the exine.

2

A

The exine often has a very distinctive pattern, which is specific to the type of plant

The exine is made up of a very durable material that allows it to survive for long periods of time

4
Q

Describe the appearance of the exine.

A

The exine often has a very distinctive pattern, which is specific to the type of plant

5
Q

What allows the exine to survive for very long periods of time?

A

The fact that exine is made up of very durable material

6
Q

The exine is made of very durable material, what does this allow for?

A

This allows the exine to survive for long periods of time

7
Q

What is the intine?

A

The intine is a thin, inner coat on a pollen grain

8
Q

What is the thin, inner coat on a pollen grain called?

A

The intine

9
Q

Why are pollen grains not called gametes?

3

A

As they do not join with other cells

i.e. they are not involved in fertilisation

They form the male sperm nuclei which are actually the gametes

10
Q

What do the pollen grains form?

A

Male sperm nuclei (male gametes)

11
Q

What happens to the anther when the pollen grains have matured?
(3)

A

The walls of the anther become dry and they shrivel

This results in the splitting (dehiscing) of the anther walls

The pollen grains are then exposed on the outside of the anther

12
Q

What is the splitting of the anther walls also called?

A

The dehiscing of the anther

13
Q

What causes the anther walls to split?

A

The anther becoming dry and shrivelled