Tag: classification of pteridophytes

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Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

Archegonium of Selaginella differs from that of Funaria in

  1. Embedded venter

  2. Absence of stalk

  3. Short neck

  4. All the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The archegonium of Selaginella is more reduced than that of Funaria, featuring an embedded venter, absence of a stalk, and a very short neck.

Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

In Dryopteris, the opening mechanism of sporangium is effectively operated by

  1. Stalk

  2. Stomium

  3. Annulus

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In Dryopteris the opening mechanism of sporangium is effectively operated by stomium. Stomium is formed of the thin-walled cells, marking the line or region of dehiscence of a fern sporangium. It is the opening in an anther, usually between lip cells through which dehiscence occurs.

Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

In Selaginella stem, trabeculae represent modified

  1. Phloem cells

  2. Endodermal cells

  3. Pericycle cells

  4. Cortical cells
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In the stem of Selaginella, the endodermal cells are elongated and form bridge-like structures called trabeculae that connect the stele to the cortex.

Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

The neck of the archegonium in Selaginella is made of

  1. Four rows of cells with several cells in each row

  2. Two tiers of four cells each

  3. Four tiers of two cells each

  4. Six rows of cells
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The neck of the archegonium in Selaginella is very short, consisting of two tiers of four cells each.

Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

Male gametophyte of Selaginella is formed 

  1. Outside the microspore

  2. Within the microspore

  3. Partly outside the microspore

  4. Partly within the microspore
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In Selaginella, the development of the male gametophyte is endosporic, meaning it occurs entirely within the microspore wall.

Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

$13$-celled male gametophyte of Selaginella has

  1. $12$-celled antheridium $+1$ prothallial cell
  2. $9$-celled antheridium $+4$ prothallial cell
  3. $7$-celled antheridium $+6$ prothallial cell
  4. $10$-celled antheridium $+3$ prothallial cell
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The 13-celled male gametophyte of Selaginella consists of 1 prothallial cell and a 12-celled antheridium.