Question

Describe the structure and life cycle of a plant which does not contain root, stem and leaves?​

Answer 1

Answer:

Bryophytes have no roots, leaves or stems. Moss and liverworts belong to this group. They are flowerless plants that grow in clumps. They don't have roots.

Answer 2

Answer:

These plants are called Bryophytes. Bryophytes do not contain roots, stems, and leaves.

Explanation:

• These are terrestrial (land plants) but only a few are aquatic. They are non-vascular and photosynthetic. They are small in size and show heteromorphic generations, which means sporophytes and gametophytes have different morphologies and the sporophyte is partially dependent on the gametophyte.
• Structure - The plant body has two structures. Either it is a thallus and attached to the substratum by rhizoids (hair-like structures, not true roots) or it is differentiated into caulalia (stem-like structures) and phyllids (leaf-like structures).
• Life cycle - Archegonium (stalked, multicellular and flask-shaped) is the female sex organ and antheridium is the male sex organ in the bryophyte. Archegonia has a neck (upper elongated portion) and a venter (lower swollen portion). Ovum is present inside the venter reason, enclosed by ventral canal cells. At maturity, the neck opens, and antherozoids from antheridia swim to antheridia via chemotaxis and enter the neck. Antherozids fuses with the egg and form diploid zygotes. Zygote forms multicellular embryo after division and the embryo is nourished by the gametophyte. Later, the embryo matures to the sporophyte which has spore tetrads. Spores release from the gametophyte and form protonema which later turn to the gametophyte.

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