Bryophyte Life Cycle Practice Questions
39 free Bryophyte Life Cycle practice questions for the NCERT Biology. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.
Why are bryophytes often referred to as the 'amphibians of the plant kingdom'?
- A They can live both in fresh water and sea water.
- B They live in soil but are dependent on water for sexual reproduction.
- C They have a vascular system similar to aquatic animals.
- D They can switch between autotrophic and heterotrophic modes of nutrition.
Correct answer: They live in soil but are dependent on water for sexual reproduction.
Bryophytes are called amphibians because while they inhabit terrestrial environments (shady, humid localities), they require a film of water for the transfer of motile male gametes to the female organ.
The dominant phase in the life cycle of a bryophyte is the:
- A Diploid sporophyte
- B Haploid gametophyte
- C Diploid zygote
- D Triploid endosperm
Correct answer: Haploid gametophyte
Unlike higher plants, the main plant body of a bryophyte is a haploid gametophyte. It produces gametes and is the independent, photosynthetic stage of the life cycle.
In bryophytes, the male sex organ is called the ______ and it produces ______ gametes.
- A Archegonium, biflagellate
- B Antheridium, multiflagellate
- C Antheridium, biflagellate
- D Archegonium, non-motile
Correct answer: Antheridium, biflagellate
The male sex organ is the antheridium, which produces biflagellate antherozoids. These motile sperm must swim through water to reach the egg.
The female sex organ in bryophytes is flask-shaped and is known as the:
- A Oogonium
- B Archegonium
- C Pistil
- D Strobila
Correct answer: Archegonium
The archegonium is the multicellular female sex organ. It is characteristic of bryophytes, pteridophytes, and gymnosperms, and contains a single egg.
Which of the following is TRUE regarding the sporophyte of bryophytes?
- A It develops directly from the germination of a haploid spore.
- B It is the dominant, independent phase of the entire life cycle.
- C It is attached to and nutritionally dependent on the gametophyte.
- D It is free-living, green and photosynthetic throughout its life.
Correct answer: It is attached to and nutritionally dependent on the gametophyte.
The sporophyte in bryophytes is not free-living. It remains physically attached to the photosynthetic gametophyte to derive its nutrition throughout its existence.
The moss sporophyte is differentiated into which three parts?
- A Root, stem, and leaves
- B Holdfast, stipe, and frond
- C Foot, seta, and capsule
- D Rhizome, frond, and sori
Correct answer: Foot, seta, and capsule
The multicellular sporophyte consists of a foot (for attachment), a seta (stalk), and a capsule where spores are produced following meiosis.
In mosses, the first stage of the gametophyte that develops directly from a spore is the:
- A Leafy stage
- B Protonema stage
- C Gemma cup
- D Prothallus
Correct answer: Protonema stage
The moss life cycle begins with the protonema stage, a creeping, green, branched, and often filamentous structure that develops from the germinating spore.
Asexual reproduction in liverworts often involves specialized green, multicellular buds called:
- A Spores
- B Gemmae
- C Conidia
- D Aplanospores
Correct answer: Gemmae
Gemmae are asexual buds produced in small receptacles called gemma cups located on the thalli. They detach from the parent and germinate to form new individuals.
Which bryophyte provides peat that has long been used as fuel and as packing material for trans-shipment of living material?
- A Marchantia
- B Riccia
- C Sphagnum
- D Funaria
Correct answer: Sphagnum
Sphagnum, also known as peat moss, has a high water-holding capacity and forms peat over time, which is valuable for fuel and horticulture.
The 'leafy stage' of mosses develops from the:
- A Primary protonema as an apical bud
- B Secondary protonema as a lateral bud
- C Zygote directly
- D Seta of the sporophyte
Correct answer: Secondary protonema as a lateral bud
The leafy stage, which bears the sex organs, develops as a lateral bud from the secondary protonema. It consists of upright, slender axes with spirally arranged leaves.
Which of the following is NOT a characteristic of bryophytes?
- A Lack of true roots, stems, or leaves
- B Presence of xylem and phloem
- C Presence of multicellular sex organs
- D Thalloid or upright plant body
Correct answer: Presence of xylem and phloem
Bryophytes are non-vascular plants. They lack specialized vascular tissues (xylem and phloem) for the conduction of water and nutrients.
Spores in bryophytes are formed by ______ inside the ______.
- A Mitosis, antheridium
- B Meiosis, capsule
- C Mitosis, archegonium
- D Meiosis, protonema
Correct answer: Meiosis, capsule
Spores are produced within the capsule of the sporophyte. Spore mother cells undergo meiosis (reduction division) to produce haploid spores.
In Marchantia, the male and female sex organs are produced on:
- A The same thallus (Monoecious)
- B Different thalli (Dioecious)
- C The protonema
- D The capsule
Correct answer: Different thalli (Dioecious)
Marchantia is a dioecious liverwort, meaning the male sex organs (on antheridiophores) and female sex organs (on archegoniophores) are found on separate plant bodies.
What is the function of rhizoids in bryophytes?
- A Manufacture of food by photosynthesis
- B Anchorage and absorption of water/minerals
- C Production and release of reproductive spores
- D Protection of the plant from grazing predators
Correct answer: Anchorage and absorption of water/minerals
Rhizoids are unicellular or multicellular hair-like structures that attach the bryophyte thallus to the substratum and assist in absorbing water and minerals.
Mosses are ecologically significant because they:
- A They are the primary commercial source of timber.
- B They are the first organisms to colonize bare rocks along with lichens.
- C They can fix atmospheric nitrogen directly within their leaves.
- D They produce large seeds that serve as food for birds.
Correct answer: They are the first organisms to colonize bare rocks along with lichens.
Mosses and lichens are pioneers in plant succession on bare rocks. They decompose rocks, making the substrate suitable for the growth of higher plants.
The moss gametophyte is attached to the soil by:
- A Slender, deep-growing tap roots
- B Simple, unicellular thread-like rhizoids
- C Multicellular branched rhizoids
- D Fibrous, adventitious feeding roots
Correct answer: Multicellular branched rhizoids
While liverworts usually have unicellular rhizoids, mosses possess multicellular, branched rhizoids to anchor their more complex, upright leafy stage.
How do mosses prevent soil erosion?
- A By secreting chemicals that bind and harden the topsoil surface.
- B By forming dense mats that reduce the impact of falling rain.
- C By growing extensive, deep-reaching taproot systems.
- D By raising the temperature of the exposed soil surface.
Correct answer: By forming dense mats that reduce the impact of falling rain.
Mosses form thick, dense cushions or mats on the soil surface. This coverage prevents soil wash-off by breaking the force of rain droplets.
In the life cycle of Funaria, the haploid number of chromosomes is found in:
- A Foot
- B Seta
- C Protonema
- D Capsule wall
Correct answer: Protonema
The protonema is part of the gametophytic generation and is therefore haploid. The foot, seta, and capsule wall are parts of the sporophyte and are diploid (2n).
Elaborate mechanisms for spore dispersal are found in:
- A Liverworts
- B Mosses
- C Algae
- D Both a and b
Correct answer: Mosses
Mosses have a more complex sporophyte than liverworts, featuring an elaborate mechanism for spore dispersal, often involving peristome teeth in the capsule.
Which sequence correctly represents the life cycle of a moss?
- A Spore → Leafy stage → Protonema → Zygote → Gametes → Sporophyte
- B Spore → Protonema → Leafy stage → Gametes → Zygote → Sporophyte
- C Sporophyte → Gametes → Zygote → Protonema → Leafy stage → Spore
- D Protonema → Spore → Zygote → Leafy stage → Gametes → Sporophyte
Correct answer: Spore → Protonema → Leafy stage → Gametes → Zygote → Sporophyte
The spore germinates into a protonema, which buds into a leafy gametophyte. The gametophyte produces gametes, which fuse to form a zygote, ultimately growing into a sporophyte.
Which phase is dominant in the life cycle of bryophytes?
- A Sporophyte
- B Zygote
- C Gametophyte
- D Gametangium
Correct answer: Gametophyte
The gametophyte is the dominant, photosynthetic, and independent phase in bryophytes. The sporophyte remains attached and dependent on it.
Why are bryophytes called amphibians of the plant kingdom?
- A They require water for reproduction
- B They grow only in water and damp places
- C They are classified as aquatic plants
- D They have roots like amphibians
Correct answer: They require water for reproduction
Bryophytes require a thin film of water for the movement of male gametes to the egg. This dependence on water for reproduction gives them the name amphibians of the plant kingdom.
Which structure anchors bryophytes to the substrate?
- A Rhizoids
- B Root hairs
- C Stems
- D Leaves
Correct answer: Rhizoids
Bryophytes lack true roots and instead have rhizoids. These help in anchorage and limited absorption of water.
The male sex organ in bryophytes is called:
- A Antheridium
- B Archegonium
- C Sporangium
- D Capsule
Correct answer: Antheridium
The antheridium is the male reproductive organ in bryophytes. It produces motile male gametes called antherozoids.
The female reproductive structure in bryophytes is:
- A Archegonium
- B Antheridium
- C Capsule
- D Protonema
Correct answer: Archegonium
The archegonium is the female reproductive organ. It is flask-shaped and contains the egg.
What is the first stage of the moss gametophyte that develops from a spore?
- A Protonema
- B Rhizoid
- C Sporangium
- D Zygote
Correct answer: Protonema
The protonema is a filamentous stage that develops directly from the spore. It later forms the leafy gametophyte.
Which part of the bryophyte sporophyte is responsible for spore production?
- A Foot
- B Seta
- C Capsule
- D Rhizoid
Correct answer: Capsule
The capsule is the spore-producing part of the sporophyte. It contains spore mother cells that undergo meiosis.
Which bryophyte structure helps in vegetative reproduction in Marchantia?
- A Rhizoids
- B Sporangia
- C Antheridia
- D Gemma cups
Correct answer: Gemma cups
Marchantia reproduces asexually through gemmae produced in gemma cups. These structures help in vegetative propagation.
Which adaptation helps bryophytes survive in dry conditions?
- A Thick waterproof bark
- B Thick waxy cuticle
- C Desiccation tolerance
- D Extensive root system
Correct answer: Desiccation tolerance
Bryophytes can tolerate desiccation and revive when water becomes available. This adaptation allows survival in dry habitats.
The bryophyte sporophyte remains attached to:
- A Substratum
- B Antheridium
- C Gametophyte
- D Protonema
Correct answer: Gametophyte
The sporophyte is dependent on the gametophyte for nutrition. It remains physically attached to it.
Which bryophyte is commonly used as peat for fuel?
- A Funaria
- B Riccia
- C Sphagnum
- D Marchantia
Correct answer: Sphagnum
Sphagnum moss accumulates in bogs to form peat. Peat is used as fuel and soil conditioner.
Which of the following is NOT a feature of bryophytes?
- A No vascular tissue
- B Presence of true roots
- C Alternation of generations
- D Dependence on water for reproduction
Correct answer: Presence of true roots
Bryophytes do not have true roots; instead, they have rhizoids. The other features are characteristic of bryophytes.
What is the ploidy of the bryophyte gametophyte?
- A Diploid
- B Haploid
- C Triploid
- D Tetraploid
Correct answer: Haploid
The gametophyte is haploid and produces gametes. The sporophyte is diploid.
The zygote in bryophytes develops into:
- A Gametophyte
- B Sporophyte
- C Spore
- D Protonema
Correct answer: Sporophyte
The zygote develops into the sporophyte, which remains attached to the gametophyte.
Which of the following helps in spore dispersal in mosses?
- A Multicellular rhizoid strands
- B Operculum and peristome teeth
- C Spirally arranged leaf blades
- D Upright stem axis and branches
Correct answer: Operculum and peristome teeth
The operculum and peristome teeth regulate spore release. They ensure effective dispersal under suitable conditions.
Which structure connects the capsule to the gametophyte in mosses?
- A Foot
- B Seta
- C Rhizoid
- D Protonema
Correct answer: Seta
The seta is a stalk that elevates the capsule, aiding in spore dispersal. It connects the capsule to the gametophyte.
Which bryophyte group has thalloid body organization?
- A True mosses
- B Hornworts
- C Liverworts
- D Bog mosses
Correct answer: Liverworts
Liverworts like Marchantia have a flattened thallus body. Mosses have a leafy structure instead.
What type of gametes are produced in bryophytes?
- A Male non-motile and female non-motile
- B Male motile and female non-motile
- C Male non-motile and female motile
- D Male motile and female motile
Correct answer: Male motile and female non-motile
Male gametes are motile and require water to reach the egg, while the female gamete is non-motile.
Which process leads to the formation of spores in bryophytes?
- A Mitosis
- B Binary fission
- C Meiosis
- D Budding
Correct answer: Meiosis
Spores are produced by meiosis in the sporophyte. This ensures genetic variation and continuation of the life cycle.