Bryophytes
Bryophytes are the mosses and liverworts, often called the amphibians of the plant kingdom. These notes on bryophytes cover their habitat, plant body, sex organs and life cycle, in which the haploid gametophyte is the main plant and the sporophyte depends on it. They also cover the ecological role of mosses, peat from Sphagnum, gemmae of liverworts, and the protonema and leafy stages of mosses. Tables, memory tricks and NEET-style match, statement and sequence questions help you revise quickly.
- ★ Must learn Bryophytes live in soil but need water for sexual reproduction, so they are the amphibians of the plant kingdom.
- The body is thallus-like, prostrate or erect, attached by rhizoids; there are no true roots, stems or leaves.
- ★ Must learn The main plant body is the haploid gametophyte; sex organs are multicellular.
- Antheridium: biflagellate antherozoids. Archegonium: flask-shaped, with a single egg.
- ★ Must learn The sporophyte (foot, seta, capsule) is not free-living; it is attached to and nourished by the gametophyte.
- Meiosis in some sporophyte cells gives haploid spores, which grow into gametophytes.
- Sphagnum gives peat, used as fuel and as packing material for living material.
- Mosses with lichens are the first colonisers of rocks; moss mats prevent soil erosion.
- ★ Must learn Liverworts: thalloid, dorsiventral (Marchantia); asexual by gemmae formed in gemma cups.
- ★ Must learn Mosses: protonema from the spore, then a leafy stage from a lateral bud on the secondary protonema.
- Moss sporophyte is more elaborate than that of liverworts. Examples: Funaria, Polytrichum, Sphagnum.
1. Bryophytes: General Features
- Bryophytes include the various mosses and liverworts.
- They commonly grow in moist shaded areas in the hills.
- ★ Exam imp They are called the amphibians of the plant kingdom.
- They can live in soil, but they depend on water for sexual reproduction.
- They usually occur in damp, humid and shaded localities.
- They play an important role in plant succession on bare rocks and soil.
- The plant body is more differentiated than that of algae.
- It is thallus-like and prostrate or erect.
- It is attached to the substratum by unicellular or multicellular rhizoids.
- ★ Exam imp Bryophytes lack true roots, stem or leaves.
- They may possess root-like, leaf-like or stem-like structures.
★ Very important Bryophytes are the amphibians of the plant kingdom: they live on land (in soil) but need water for sexual reproduction.
2. Sex Organs and Life Cycle
- ★ Exam imp The main plant body of a bryophyte is haploid.
- It produces gametes, so it is called a gametophyte.
- Bryophytes bear multicellular sex organs.
- The male sex organ is the antheridium. It produces biflagellate antherozoids.
- The female sex organ is the archegonium. It is flask-shaped and produces a single egg.
2.1 Steps of the life cycle
- The haploid gametophyte bears antheridia and archegonia.
- Antherozoids are released into water and come in contact with the archegonium.
- An antherozoid fuses with the egg to produce the diploid zygote.
- The zygote does not undergo reduction division (meiosis) immediately.
- Instead, it produces a multicellular sporophyte.
- The sporophyte is not free-living. It stays attached to the photosynthetic gametophyte and derives nourishment from it.
- Some cells of the sporophyte undergo meiosis to produce haploid spores.
- The spores germinate to produce new gametophytes.
★ Very important In bryophytes the gametophyte is the dominant, independent phase; the sporophyte is dependent on it for nourishment.
The green moss you see is the gametophyte. The thin stalk with a capsule growing out of it is the sporophyte. From pteridophytes onwards, the sporophyte is the main plant you see.
Ploidy shortcut: everything on the gametophyte side (gametophyte, antheridium, archegonium, gametes, spores) is haploid (n). The zygote and the whole sporophyte (foot, seta, capsule wall) are diploid (2n). Meiosis links the two phases inside the sporophyte.
What is the shape of the archegonium, and how many eggs does it hold?
How many flagella does a bryophyte antherozoid have?
Does the bryophyte zygote undergo meiosis at once?
Where does the bryophyte sporophyte get its food?
3. Economic and Ecological Importance
- Bryophytes in general are of little economic importance.
- Some mosses provide food for herbivorous mammals, birds and other animals.
- ★ Exam imp Species of Sphagnum, a moss, provide peat.
- Peat has long been used as fuel.
- It is also used as packing material for trans-shipment of living material, because of its capacity to hold water.
- ★ Exam imp Mosses, along with lichens, are the first organisms to colonise rocks. So they are of great ecological importance.
- They decompose rocks, making the substrate suitable for the growth of higher plants.
- Mosses form dense mats on the soil. These reduce the impact of falling rain and prevent soil erosion.
- The bryophytes are divided into liverworts and mosses.
| Role | How bryophytes help |
|---|---|
| Food | Some mosses feed herbivorous mammals, birds and other animals |
| Fuel and packing (Sphagnum peat) | Peat burns as fuel; it holds water, so it packs living material for transport |
| Pioneers on rocks | Mosses and lichens colonise bare rock first and decompose it |
| Plant succession | They make the substrate fit for higher plants |
| Soil conservation | Dense mats reduce the impact of rain and prevent soil erosion |
Sphagnum gives Peat for Packing and fuel: P for peat, P for packing. Its water-holding capacity keeps living material moist.
4. Liverworts
- Liverworts usually grow in moist, shady habitats.
- Such habitats: banks of streams, marshy ground, damp soil, bark of trees and deep in the woods.
- ★ Exam imp The plant body of a liverwort is thalloid, for example Marchantia.
- The thallus is dorsiventral: it has distinct upper (dorsal) and lower (ventral) surfaces.
- It is closely appressed (pressed flat) to the substrate.
- The leafy members have tiny leaf-like appendages in two rows on stem-like structures.
- Asexual reproduction takes place by fragmentation of thalli, or by specialised structures called gemmae (singular: gemma).
- ★ Exam imp Gemmae are green, multicellular, asexual buds.
- Gemmae develop in small receptacles called gemma cups, located on the thalli.
- Gemmae detach from the parent body and germinate into new individuals.
- During sexual reproduction, male and female sex organs are produced either on the same or on different thalli.
- The sporophyte is differentiated into a foot, seta and capsule.
- After meiosis, spores are produced within the capsule.
- These spores germinate to form free-living gametophytes.
★ Very important Gemmae are green, multicellular, asexual buds formed in gemma cups on the liverwort thallus. They detach and grow into new plants.
ARCHEgoniophore carries archegonia, so it is on the female thallus. ANTHERidiophore carries antheridia, so it is on the male thallus. The name of the stalk tells the sex.
Sporophyte parts from the gametophyte outwards: Foot, Seta, Capsule (F-S-C). The foot is embedded in the gametophyte, the seta is the stalk, and the capsule at its end holds the spores.
5. Mosses
- The predominant stage of the moss life cycle is the gametophyte.
- The gametophyte consists of two stages: the protonema stage and the leafy stage.
- ★ Exam imp The first stage, the protonema, develops directly from a spore.
- The protonema is a creeping, green, branched and frequently filamentous stage.
- The second stage is the leafy stage.
- It develops from the secondary protonema as a lateral bud.
- The leafy stage has upright, slender axes bearing spirally arranged leaves.
- It is attached to the soil through multicellular and branched rhizoids.
- The leafy stage bears the sex organs.
- Vegetative reproduction is by fragmentation and by budding in the secondary protonema.
- In sexual reproduction, antheridia and archegonia are produced at the apex of the leafy shoots.
- After fertilisation, the zygote develops into a sporophyte with a foot, seta and capsule.
- ★ Exam imp The moss sporophyte is more elaborate than that of liverworts.
- The capsule contains spores, which are formed after meiosis.
- Mosses have an elaborate mechanism of spore dispersal.
- Common examples: Funaria, Polytrichum and Sphagnum.
5.1 Sequence of stages in a moss
- A haploid spore germinates.
- It forms the protonema: creeping, green, branched and often filamentous.
- A lateral bud on the secondary protonema grows into the leafy stage.
- Antheridia and archegonia develop at the apex of the leafy shoots.
- Fertilisation gives a zygote, which grows into the sporophyte (foot, seta, capsule).
- Meiosis in the capsule forms spores, which are then dispersed.
★ Very important The protonema is the first stage of the moss gametophyte. It grows directly from the spore; the leafy stage grows later as a lateral bud.
Moss examples: FPS, as in "frames per second": Funaria, Polytrichum, Sphagnum. Liverwort example: Marchantia.
Moss order: Spore, Protonema, Bud, Leafy shoot: "Some People Build Leaves". The bud forms on the secondary protonema.
From which stage does the leafy stage of a moss arise?
Where are the sex organs borne in a moss?
Name the green multicellular asexual buds of liverworts.
In the Marchantia figure, which stalk is on the female thallus?
In a moss plant, which two parts make up the visible sporophyte?
6. Liverworts and Mosses Compared
| Feature | Liverworts | Mosses |
|---|---|---|
| Plant body | Thalloid, dorsiventral, closely appressed (Marchantia); leafy forms have appendages in two rows | Upright, slender axes with spirally arranged leaves |
| Stages of gametophyte | A thalloid (or leafy) plant body | Two: protonema and leafy stage |
| Rhizoids | Present on the thallus | Multicellular and branched |
| Asexual or vegetative reproduction | Fragmentation of thalli; gemmae in gemma cups | Fragmentation; budding in the secondary protonema |
| Sex organs | On the same or on different thalli | At the apex of the leafy shoots |
| Sporophyte | Foot, seta and capsule | Foot, seta and capsule; more elaborate; elaborate spore dispersal |
| Examples | Marchantia | Funaria, Polytrichum, Sphagnum |
If a statement mentions gemmae or gemma cups, think liverwort. If it mentions protonema, budding or spirally arranged leaves, think moss.
7. Exam Essentials: Traps, Exceptions, Numbers and Pairs
Points NEET builds statements and assertion traps from:
- The zygote does not undergo meiosis immediately; it first forms the sporophyte.
- The sporophyte is attached to and nourished by the gametophyte; it is not free-living.
- Archegonium: flask-shaped, a single egg. Antherozoids: biflagellate.
- Bryophytes have rhizoids and root-like parts, but no true roots.
- Water is essential for fertilisation, even though bryophytes grow on land.
- Protonema develops directly from a spore; the leafy stage comes from the secondary protonema.
Exceptions
- Bryophytes live on land, yet they cannot reproduce sexually without water.
- They have root-like, stem-like and leaf-like parts, but not true roots, stems or leaves.
- Bryophytes are of little economic importance; Sphagnum peat is the main exception.
- The sporophyte is not free-living, unlike the sporophyte of pteridophytes.
- Rhizoids may be unicellular or multicellular; in mosses they are multicellular and branched.
- Liverwort sex organs may be on the same or different thalli.
Numbers to Remember
- 1 egg in each archegonium.
- 2 flagella on each antherozoid (biflagellate).
- 2 rows of leaf-like appendages in leafy liverworts.
- 2 stages in the moss gametophyte: protonema and leafy stage.
- 3 parts of the sporophyte: foot, seta, capsule.
- 2 groups of bryophytes: liverworts and mosses.
Examples to Remember
| Group | Examples |
|---|---|
| Liverworts | Marchantia |
| Mosses | Funaria, Polytrichum, Sphagnum |
| Moss giving peat | Sphagnum |
Pairs to Match
| Item | Matches with |
|---|---|
| Antheridium | Male sex organ; biflagellate antherozoids |
| Archegonium | Flask-shaped female sex organ; single egg |
| Gemma | Green, multicellular asexual bud of liverworts |
| Gemma cup | Receptacle on the thallus holding gemmae |
| Archegoniophore | Stalk on the female Marchantia thallus |
| Antheridiophore | Stalk on the male Marchantia thallus |
| Protonema | First moss stage, growing directly from a spore |
| Secondary protonema | Gives the leafy stage as a lateral bud |
| Capsule | Part of the sporophyte where meiosis forms spores |
| Sphagnum | Peat; fuel and packing material |
| Mosses with lichens | First colonisers of rocks |
| Moss mats | Reduce impact of rain; prevent soil erosion |
| Rhizoids | Attach the plant body to the substratum |
8. Quick Revision
- Bryophytes: mosses and liverworts of moist, shaded areas in the hills.
- Amphibians of the plant kingdom: live in soil, need water for sexual reproduction.
- Role in plant succession on bare rocks and soil.
- Body more differentiated than algae; thallus-like, prostrate or erect; rhizoids; no true roots, stem or leaves.
- Main plant body: haploid gametophyte with multicellular sex organs.
- Antheridium: biflagellate antherozoids. Archegonium: flask-shaped, single egg.
- Fertilisation needs water; the zygote forms a multicellular sporophyte without immediate meiosis.
- Sporophyte depends on the gametophyte; meiosis in it gives haploid spores.
- Sphagnum peat: fuel and packing material; mosses feed herbivorous animals and birds.
- Mosses and lichens colonise rocks first; moss mats prevent soil erosion.
- Liverworts: thalloid, dorsiventral Marchantia; gemmae in gemma cups; sporophyte of foot, seta, capsule.
- Mosses: protonema from spore, leafy stage from secondary protonema; sex organs at shoot apex.
- Moss sporophyte is more elaborate, with elaborate spore dispersal; Funaria, Polytrichum, Sphagnum.
9. Solved Examples
| List I | List II |
|---|---|
| A. Gemmae | I. Flask-shaped, with a single egg |
| B. Protonema | II. Peat |
| C. Archegonium | III. Asexual buds in cups on a liverwort thallus |
| D. Sphagnum | IV. First stage of a moss, from a spore |
(1) A-II, B-IV, C-I, D-III
(2) A-IV, B-III, C-I, D-II
(3) A-III, B-I, C-IV, D-II
(4) A-III, B-IV, C-I, D-II
Answer: (4). Gemmae are asexual buds of liverworts (III), the protonema grows from a moss spore (IV), the archegonium is flask-shaped with one egg (I), and Sphagnum gives peat (II).
A. The main plant body is diploid.
B. The antherozoids are biflagellate.
C. The zygote undergoes meiosis immediately after fertilisation.
D. The sporophyte derives nourishment from the gametophyte.
E. Water is needed for fertilisation.
Choose the correct answer from the options given below:
(1) A, B and C only
(2) B, D and E only
(3) B, C and D only
(4) A, D and E only
Answer: (2). A is wrong: the main plant body is the haploid gametophyte. C is wrong: the zygote first forms a multicellular sporophyte, and meiosis happens later in some sporophyte cells.
A. Leafy stage bearing sex organs
B. Protonema
C. Sporophyte with capsule
D. Spore
E. Zygote
Choose the correct answer from the options given below:
(1) B, D, A, C, E
(2) D, A, B, E, C
(3) D, B, A, E, C
(4) D, B, E, A, C
Answer: (3). Spore (D) forms the protonema (B); a lateral bud gives the leafy stage (A); fertilisation gives the zygote (E), which grows into the sporophyte (C).
(1) grow only in water
(2) live in soil but need water for sexual reproduction
(3) have both gametophyte and sporophyte free-living
(4) live both on rocks and on tree bark
Answer: (2). They live in soil but depend on water for sexual reproduction, just as amphibians return to water to breed.
(1) Spores are formed after meiosis in the capsule.
(2) Vegetative reproduction includes budding in the secondary protonema.
(3) Gemmae in gemma cups are the main means of asexual reproduction.
(4) The leafy stage has spirally arranged leaves.
Answer: (3). Gemmae and gemma cups belong to liverworts such as Marchantia. Mosses reproduce vegetatively by fragmentation and budding in the secondary protonema.
Statement I: Mosses along with lichens are the first organisms to colonise rocks.
Statement II: The sporophyte of a moss is simpler than that of a liverwort.
In the light of the above statements, choose the correct answer from the options given below:
(1) Both Statement I and Statement II are correct
(2) Both Statement I and Statement II are incorrect
(3) Statement I is correct but Statement II is incorrect
(4) Statement I is incorrect but Statement II is correct
Answer: (3). Statement I is correct. Statement II is wrong: the moss sporophyte is more elaborate than that of liverworts.
10. Practice Questions
- Match List I (part) with List II (feature).
Choose the correct answer from the options given below:
List I List II A. Antheridium I. Attach the plant body to the substratum B. Seta II. Receptacle holding gemmae C. Rhizoids III. Produces biflagellate antherozoids D. Gemma cup IV. Stalk of the sporophyte
(1) A-III, B-I, C-IV, D-II
(2) A-IV, B-III, C-I, D-II
(3) A-III, B-IV, C-I, D-II
(4) A-II, B-IV, C-I, D-IIIAnswer: (3). Antheridium makes antherozoids (III), seta is the sporophyte stalk (IV), rhizoids attach the plant (I), and gemma cups hold gemmae (II). - Which statements about liverworts are correct?
A. The thallus is dorsiventral and closely appressed to the substrate.
B. Leafy members bear leaf-like appendages in two rows.
C. Male and female sex organs are always on different thalli.
D. Spores formed in the capsule grow into free-living gametophytes.
Choose the correct answer from the options given below:
(1) A, B and C only
(2) A, B and D only
(3) B, C and D only
(4) A and C onlyAnswer: (2). C is wrong: sex organs may be on the same or on different thalli. - Arrange the events after fertilisation in a bryophyte in the correct order.
A. Haploid spores form
B. Multicellular sporophyte develops
C. Zygote forms
D. Meiosis in some sporophyte cells
Choose the correct answer from the options given below:
(1) C, B, A, D
(2) C, D, B, A
(3) B, C, D, A
(4) C, B, D, AAnswer: (4). Zygote (C), sporophyte (B), meiosis (D), spores (A). - Which of the following is NOT a use or role of bryophytes?
(1) Sphagnum peat used as fuel
(2) Sphagnum used as packing material because it holds water
(3) Source of agar for growing microbes
(4) Moss mats preventing soil erosionAnswer: (3). Agar comes from the red algae Gelidium and Gracilaria, not from bryophytes. - Given below are two statements:
Statement I: The leafy stage of a moss develops directly from the spore.
Statement II: Antheridia and archegonia of mosses are produced at the apex of the leafy shoots.
In the light of the above statements, choose the correct answer from the options given below:
(1) Both Statement I and Statement II are correct
(2) Both Statement I and Statement II are incorrect
(3) Statement I is correct but Statement II is incorrect
(4) Statement I is incorrect but Statement II is correctAnswer: (4). The protonema develops from the spore; the leafy stage arises later from the secondary protonema as a lateral bud. - Explain protonema with an example.Answer: The protonema is the first stage of the moss gametophyte. It develops directly from a spore and is creeping, green, branched and often filamentous, for example in Funaria.
- Explain antheridium with an example.Answer: The antheridium is the multicellular male sex organ of bryophytes and pteridophytes. In Marchantia and mosses it produces biflagellate antherozoids.
- Explain archegonium with an example.Answer: The archegonium is the flask-shaped, multicellular female sex organ that produces a single egg. It occurs in bryophytes such as Marchantia, in pteridophytes and in gymnosperms.
- Differentiate between liverworts and mosses.Answer: Liverworts: flat, dorsiventral thallus (Marchantia), gemmae in gemma cups, simpler sporophyte. Mosses: protonema and upright leafy stage with spiral leaves, budding in secondary protonema, sex organs at shoot apex, more elaborate sporophyte.
Common Mistakes to Avoid
- Calling the main bryophyte plant diploid. It is the haploid gametophyte.
- Saying the zygote undergoes meiosis at once. It first forms a multicellular sporophyte; meiosis happens later in some sporophyte cells.
- Calling the bryophyte sporophyte independent. It is attached to the gametophyte and depends on it for nourishment.
- Linking gemmae with mosses. Gemmae and gemma cups belong to liverworts such as Marchantia.
- Writing that the leafy stage grows directly from the spore. The protonema does; the leafy stage comes from the secondary protonema.
- Calling rhizoids true roots. Bryophytes have no true roots, stems or leaves.
- Swapping archegoniophore and antheridiophore. The archegoniophore is on the female thallus.
- Saying the moss sporophyte is simpler than the liverwort sporophyte. It is more elaborate.
Frequently Asked Questions
Why are bryophytes called amphibians of the plant kingdom?
Bryophytes can live in soil on land, but they depend on water for sexual reproduction. Their antherozoids are released into water and swim to the archegonium to fertilise the egg. This dependence on both land and water is why they are compared with amphibians.
Is the main plant body of a bryophyte haploid or diploid?
The main plant body of a bryophyte is haploid. It produces gametes, so it is called the gametophyte. The diploid sporophyte develops from the zygote, stays attached to the gametophyte and depends on it for nourishment. Meiosis in some sporophyte cells produces haploid spores.
What are gemmae?
Gemmae are green, multicellular, asexual buds of liverworts such as Marchantia. They develop in small receptacles called gemma cups on the thallus. Gemmae detach from the parent plant and germinate into new individuals. This is a means of asexual reproduction, along with fragmentation of the thallus.
What is the protonema of a moss?
The protonema is the first stage of the moss gametophyte. It develops directly from a spore and is creeping, green, branched and frequently filamentous. The second, leafy stage develops from the secondary protonema as a lateral bud and bears the sex organs.
How do liverworts differ from mosses?
Liverworts such as Marchantia have a flat, dorsiventral thallus and reproduce asexually by gemmae. Mosses have a protonema stage and an upright leafy stage with spirally arranged leaves. The moss sporophyte is more elaborate than that of liverworts and has an elaborate mechanism of spore dispersal.
What is the economic importance of bryophytes?
Bryophytes in general are of little economic importance. Some mosses provide food for herbivorous mammals, birds and other animals. Sphagnum provides peat, used as fuel and as a packing material for living material because it holds water. Mosses also prevent soil erosion.
What is the ecological importance of mosses?
Mosses, along with lichens, are the first organisms to colonise bare rocks. They decompose rocks and make the substrate suitable for higher plants, so they help in plant succession. Their dense mats on soil reduce the impact of falling rain and prevent soil erosion.
Which bryophyte points are important for NEET?
Learn the haploid dominant gametophyte, the dependent sporophyte, biflagellate antherozoids and the single egg in the flask-shaped archegonium. Learn gemmae of Marchantia, the protonema and leafy stages of mosses, Sphagnum peat, and the examples Funaria, Polytrichum and Sphagnum. Statement questions often test these.
Previous year questions on Bryophytes
3 questions from past papers, each with a step-by-step solution.
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