Tag: classification of pteridophytes

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Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

Which species of Selaginella exhibits homophylly?

  1. S. kraussiana

  2. S. helvetica

  3. S. rupestris

  4. S. lepidophylla
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

S. rupestris is known for having uniform leaves, exhibiting homophylly, whereas most other Selaginella species are heterophyllous.

Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

Selaginella has a character of evolutionary importance, which is presence of?

  1. Seed

  2. Heterospory

  3. Strobilus

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

Because Selaginella has both microspores and megaspores, the plant is called as heterosporous. The other fern-allies are homosporous (having only one type/size of spore). This significance of this advance in evolution is important because sexual dimorphism is being expressed much earlier in the life cycle. The organisms to appeared next this are all heterosporous.

Therefore, the correct answer is option B.

Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

Which of the following pteridophytes that inhabit desert regions are popularly known as 'resurrection plants'?

  1. Horneophyton

  2. Asteroxylon

  3. Selaginella

  4. Rhynia
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A resurrection plant is any poikilohydric plant that can survive extreme dehydration, even over months or years. Selaginella lepidophylla, is known as resurrection plant or birds nest moss as it shows ball like appearance (cespitose habit) in dry season. It is a plant species native to North America, Central and South America, and sold as a novelty.

Thus, the correct answer is option C.

Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

Which one is heterosporous?

  1. Dryopteris

  2. Adiantum

  3. Salvinia

  4. Equisetum
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Heterospory means the production of two spores of different sizes and of two different development patterns. Small spore is called microspore and large spore is called megaspore. Microspore produces the male gametophyte that possesses male sex organs while megaspore produces the female gametophyte that possesses female sex organs. It ultimately leads to seed development. For example, Selaginella, Salvinia, Azolla. Dryopteris and Adiantum are homosporous and haploid spores are produced in each sporangium. 

Thus, the correct answer is option C.

Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

Match List I with List II and select the correct answer.

List I List II
a. Trabeculae of Selaginella $1$. Endodermal in nature
b. Trabeculae of Marsilea $2$. Cortical in nature
c. Trabeculae of soetes $3$. Sporogenous in nature
d. Trabeculae of Funaria $4$. Amphithecia in nature
  1. A-$1$, B-$2$, C-$3$, D-$4$
  2. A-$3$, B-$2$, C-$4$, D-$1$
  3. A-$1$, B-$3$, C-$4$, D-$2$
  4. A-$4$, B-$3$, C-$1$, D-$2$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In Selaginella, trabeculae are endodermal in nature as they develop from the endodermis. In Marsilea, they are cortical. 'soetes' appears to be a typo (likely for 'isoetes'), where trabeculae are sporogenous. In Funaria (moss), trabeculae are amphithecial in nature, developing from the amphithecium layer of the sporangium wall.

Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

Match List-I (Groups of plants) with List II(Characters present) and select the correct answer.

List-I List-II
a. Psilopsida $1$. Sporangiophore
b. Lycopsida $2$. Megaphyllous leaf
c. Sphenopsida $3$. Rootless plants
d. Pteropsida $4$. Companion cells
$5$. Single sporangium on the ad axial surface of a isopropyl
  1. A-$3$, B-$1$, C-$4$, D-$2$
  2. A-$3$, B-$5$, C-$1$, D-$2$
  3. A-$1$, B-$3$, C-$4$, D-$5$
  4. A-$2$, B-$5$, C-$1$, D-$3$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The matching of groups to their characteristics is: Psilopsida (rootless), Lycopsida (sporangiophore), Sphenopsida (companion cells - though this is debatable, it is the provided key), and Pteropsida (megaphyllous leaf).

Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

Prothallus of Dryopteris is a ................ . It bears archegonia on the ................... side. 

  1. Sporophyte, dorsal

  2. Sporophyte, ventral

  3. Gametophyte, dorsal

  4. Gametophyte, ventral
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • Spore is uninucleate haploid spherical structure.
  • The spore germinates into gametophyte known as prothallus.
  • Prothallus has archegonia present on the ventral side.
  • Hence, the Prothallus of Dryopteris is a Gametophyte.  It bears archegonia on the ventral side. 
  • So, the correct answer is 'Gametophyte, ventral'.