Non-vascular Plants (unit 4)

Non-vascular plants, also known as Bryophytes, include three main phyla which are Anthocerophyta (hornworts), Hepaticophyta (liverworts), and Bryophyta (mosses). The incorrect answers provided are vascular plants (Tracheophyta), ferns (Pteridophyta), and flowering plants (Magnoliophyta) which do not fall under the category of non-vascular plants.

Non-vascular plants do not have specialized tissues for transporting water and nutrients, unlike vascular plants which have xylem and phloem.

Non-vascular plants include mosses, liverworts, and hornworts. Mosses make up the majority of species in this category, with an estimated ~19,000 species known to exist.

In non-vascular plants, the multicellular gametangia responsible for producing and releasing sperm are called antheridia, while the multicellular gametangia responsible for containing and releasing eggs are called archegonia.

In non-vascular plants, the zygote develops into a multicellular embryo inside the archegonium, which is a structure that holds the egg cell and provides a protected environment for its development.

Non-vascular plants such as mosses, liverworts, and hornworts require damp conditions for growth and reproduction. They are rarely found in sunny, arid deserts, deep underground in caves, or high on mountain peaks due to their lack of vascular tissue for water transport.

Non-vascular plants exhibit an oogamous life cycle with heteromorphic alternation of generations, where gametes are produced by mitosis and the gametophyte (1N-haploid) is dominant. The incorrect answers provided describe different types of life cycles that do not apply to non-vascular plants.

The dominant phase of a life cycle refers to the stage that is longer-lived, typically larger, and nutritionally independent. In contrast, incorrect answers describe characteristics of a non-dominant phase in a life cycle.

Phylum Anthocerophyta consists of hornworts, which are not very common, diverse, or large. Liverworts, Mosses, and Ferns belong to different phyla and are not examples of Anthocerophyta.

Phylum Hapticophyta includes liverworts, which have distinct characteristics such as thalloid and leafy forms, small sporophytes, and sometimes non-photosynthetic nutrition. They are commonly found in damp or shady habitats.

Leafy liverworts are a dominant group of bryophytes that are responsible for approximately 85% of the diversity within the liverwort group, making them a crucial component in the ecosystem.

Marchantia is a liverwort and the female gametophyte structure is known as Archegoniophores, where archegonia are located. Antheridia are male gametophyte structures, Gametophores are not specific to Marchantia, and Sporophytes are the diploid, spore-producing phase of the plant.

The correct answer describes the key features of the female gametophyte of Marchantia, including the tail being the archegonium and the circular mass in the head being the egg. Once fertilized, this structure develops into a multicellular embryo that eventually becomes an archegonium.

Marchantia sporophytes are known for opening under an archegoniophore to release spores for reproduction.

A Marchantia sporophyte specifically refers to the diploid phase in the life cycle of Marchantia, a type of liverwort plant. Sporophytes are typically microscopic in size and are an essential part of the plant's reproductive cycle.

Phylum Bryophyta includes mosses as an example with the dominant generation being the gametophyte generation.

Hydroids are not aquatic plants but rather cellular structures that play a role similar to xylem/vascular systems. They have thin walls which facilitate osmosis.

Mosses have a unique life cycle with two main stages – the gametophyte stage (where sexual reproduction occurs) and the sporophyte stage (where spores are produced).

Mosses have a unique life cycle that involves both gametophyte and sporophyte stages, unlike plants that reproduce by seeds or have flowers. This life cycle is essential to their survival and reproductive process.

Protonemata are not related to fungi, minerals, or microscopic organisms, but rather refer to the thread-like chain of cells in the moss life cycle.

In Bryophytes, Antheridia are the male gametophytes responsible for producing sperm, while Archegonia are the female gametophytes that produce eggs for fertilization.

Male gametophytes of bryophyta produce many sperm in each antheridium, which are then released for fertilization.

In bryophytes, the female gametophytes produce only one egg in each archegonium as part of the reproductive process.

In mosses, the antheridium and archegonium are surrounded by multicellular gametangium also known as 'sterile jacket'. This protective layer helps in the development and protection of the gametes within.

In Bryophyta, fertilization is achieved through the sperm traveling from antheridium to egg in the archegonium. This process relies on water or rain for the sperm to swim towards the egg, eventually forming a diploid zygote.

In Bryophyta (moss), the sporophyte develops within the archegonium of the gametophyte, grows as a stalk, and remains attached for nutrition. The sporophyte is short-lived, contrasting the dominant gametophyte stage.

In moss sporophytes, the specialized cells in the capsule (sporangium) undergo meiosis to produce 1N spores. This process is essential for the reproductive cycle of mosses.

Peristome teeth are actually specialized structures found in the capsules of mosses, specifically in the phylum Bryophyta. They play a crucial role in the dispersal of spores.

Mosses have various economic uses such as gardening, medical dressing, fuel, and flavor enhancement. They are not commonly used for decorative purposes in floral arrangements, baking cakes, or manufacturing electronic devices.