Tag: botany

Archegoniophores are specialized stalked structures that bear archegonia in certain liverworts, most notably Marchantia, where both antheridiophores and archegoniophores are produced.

Adiantum is widely known as the maidenhair fern due to the appearance of its delicate, dark-colored leaf stalks.

Equisetum is commonly known as horse-tail due to its jointed, ribbed stems that resemble a horse's tail. It is a well-known genus of pteridophytes.

• Azolla is a genus of seven species of aquatic ferns belonging to family Salviniaceae. They are extremely reduced in form and specialized. They look similar to duckweeds and mosses.
  
• Salvinia, commonly known as Watermoss is a genus belonging to family Salviniaceae. It is a floating aquatic fern. Salvinia is related to other water ferns such as Azolla. 
  
• Marsilea, commonly known as water clover and four-leaf clover is a genus of approximately 65 species of aquatic ferns belonging to family Marsileaceae.
  
• Hence Azolla, Salvinia and marsilea are water ferns.
• So, the correct answer is 'All the above'.

Pteropsida (ferns) includes genera like Pteris, Adiantum, and Dryopteris. Psilotum belongs to Psilopsida, and Selaginella belongs to Lycopsida.

Vascular cryptogams are plants that possess vascular tissue (xylem and phloem) but reproduce via spores rather than seeds. Equisetum is a pteridophyte, which fits this definition, whereas Marchantia is a bryophyte (non-vascular) and Cedrus/Ginkgo are gymnosperms (seeded).

In pteridophytes, the main plant body is the sporophyte (2n). Meiosis or reduction division occurs during spore formation within the sporangia to produce haploid spores (n), which subsequently germinate into the gametophyte generation.

Ginkgo biloba is commonly known as the maidenhair tree because its fan-shaped leaves resemble the leaflets of the maidenhair fern (Adiantum). It is a unique living fossil gymnosperm.