Problem 100 - Objective Biology for NEET

Question

Marchantia is (a) An algae (b) Gymnosperm (c) Fern (d) Bryophyte

Step-by-Step Solution

Answer

The correct classification of Marchantia is (d) Bryophyte.

Step 1: Understand the Classification of Marchantia

The first step is to know what Marchantia is in the biological classification. Marchantia is a genus of liverworts from the Marchantiaceae family. Liverworts are a type of plant under the category of Bryophytes.

Step 2: Comparing With the Options

Examine the given options. An algae is a simple, non-flowering plant. Gymnosperms are a type of vascular plant, ferns are non-flowering vascular plants and Bryophytes are non-vascular plants.

Step 3: Choose the Correct Option

Since Marchantia is a liverwort and liverworts are Bryophytes, then the correct choice is option (d) Bryophyte.

Key Concepts

Marchantia

Marchantia is an intriguing genus that belongs to the Marchantiaceae family. It is a prominent example of a group of non-vascular plants known as liverworts. These fascinating organisms have a simple structure. Unlike higher plants, Marchantia does not have roots, stems, or true leaves.
Instead, they have a flattened, ribbon-like body structure called a thallus, which aids in photosynthesis and nutrient absorption. Marchantia thrives in moist, shaded environments, often found growing in damp soil, rocks, or tree barks.
Their reproductive mechanisms involve spores rather than seeds, which distinguishes them from most other plant groups.

• Characterized by a flattened thallus.
• Grows in moist, shaded places.
• Reproduces via spores, not seeds.

Bryophytes

Bryophytes form one of the earliest groups of plants to evolve on land. They are distinct for being non-vascular, which means they do not have specialized tissues (like xylem and phloem) to conduct water and nutrients.
Types of Bryophytes include mosses, liverworts, and hornworts. These plants are primarily green and rely heavily on water for survival and reproduction.
Bryophytes reproduce using spores, and they have a life cycle involving alternating generations - a dominant gametophyte stage and a dependent sporophyte stage.

• Non-vascular plant group.
• Includes mosses, liverworts, hornworts.
• Reproduce using spores.
• Exhibit alternation of generations in their life cycle.

Liverworts

Liverworts, closely related to mosses and hornworts, belong to the Bryophyte category. These small plants play a crucial role in the ecosystem by helping to break down rocks and contribute to the formation of soil.
One distinctive feature of liverworts like Marchantia is their ability to reproduce both sexually and asexually. In sexual reproduction, they produce specialized structures that release spores, while asexual reproduction involves gemmae, which are small, multi-cellular bodies that can develop into new plants.
Liverworts are incredibly adaptive, but they still require moisture for growth and reproduction.

• Important in soil formation.
• Can reproduce sexually and asexually.
• Requires high moisture levels.
• Uses spores for reproduction.