Tag: biology

Questions Related to biology

Dorstenia an example for.

classification of pteridophytes kingdom plantae plant kingdom biology

  1. Raceme

  2. Panicle

  3. Spadix

  4. Coenanthium

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Correct Option: D

The microspore of selaginella may be as small as _______________.

classification of pteridophytes kingdom plantae plant kingdom biology

  1. 5 $\mu $

  2. 15 $\mu $

  3. 1.5 $\mu $

  4. S $\mu $

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Correct Option: B

Archegonium of Selaginella differs from that of Funaria in

classification of pteridophytes kingdom plantae plant kingdom biology

  1. Embedded venter

  2. Absence of stalk

  3. Short neck

  4. All the above

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Correct Option: D

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

classification of pteridophytes kingdom plantae plant kingdom biology

  1. Stalk

  2. Stomium

  3. Annulus

  4. None of the above

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Correct Option: B
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.

In Selaginella stem, trabeculae represent modified

classification of pteridophytes kingdom plantae plant kingdom biology

  1. Phloem cells

  2. Endodermal cells

  3. Pericycle cells

  4. Cortical cells

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Correct Option: B

The neck of the archegonium in Selaginella is made of

classification of pteridophytes kingdom plantae plant kingdom biology

  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

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Correct Option: B

Male gametophyte of Selaginella is formed 

classification of pteridophytes kingdom plantae plant kingdom biology

  1. Outside the microspore

  2. Within the microspore

  3. Partly outside the microspore

  4. Partly within the microspore

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Correct Option: B

The megaspore of Selaginella on germination produces

classification of pteridophytes kingdom plantae plant kingdom biology

  1. Female gametes

  2. Female gametangia

  3. Female prothallus

  4. Male prothallus

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Correct Option: C

$13$-celled male gametophyte of Selaginella has

classification of pteridophytes kingdom plantae plant kingdom biology

  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

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Correct Option: A

Heterospory and ligulate leaves occur in

classification of pteridophytes kingdom plantae plant kingdom biology

  1. Selaginella

  2. Ferns

  3. Mosses

  4. Liverworts

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Correct Option: A