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Division Arthrophyta (Seedless Vascular Plants) > Reproduction > Flashcards

Flashcards in Reproduction Deck (10)
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1
Q

Where are Sporangia localized?

A

In strobili

2
Q

What are Sporangiophores?

A

Sporangia-bearing appendages

Careful - NOT known as sporophylls.

3
Q

What does each Sporangiophore bear?

A

5-10 cylindrical sporangia on adaxial surface.

4
Q
Step 1
(Hint: Sporogenous tissue)
A

Sporogenous tissue in sporangia give rise to sporocytes, which give tetrad meiospores by meiosis.

5
Q

Is Equisetum homosporous or heterosporous?

A

Homosporous

6
Q
Step 2
(Hint: Elaters)
A

1) Spores have elaters (appendages) which arise by the cracking of the outermost layer of the spore wall.
2) Elaters are very sensitive to humidity.

7
Q
Step 3
(Hint: Chlorophyll)
A

1) Spores rich in chlorophyll develop into gametophytes on moist soil.
2) They grow & produce outgrowths between which the antheridia & archegonia are borne.

8
Q
Step 4
(Hint: Gametophytes)
A

1) Some gametophytes produce archegonia & then antheridia; others produce only antheridia.
2) This provides cross-fertilization as well as self-fertilization.

9
Q

Briefly describe the Archegonial neck.

A

Has four rows of neck cells

10
Q
Step 5
(Hint: Fertilization)
A

After fertilization, a sporophyte develops which consists of an absorptive foot + erect shoot (with nodes & internodes) + a radicle.