Liverworts and Mosses: Structure and Reproduction
Bryophytes compress an entire plant life cycle into a few centimetres of damp ground. This quiz tests your command of the two great bryophyte divisions — liverworts and mosses — as presented in Lesson 5.
You will be examined on:
- The dorsiventral thallus of Marchantia and the habitats liverworts favour
- Gemmae and gemma cups as agents of asexual propagation
- The protonema and leafy stages of the moss gametophyte
- Sporophyte architecture — foot, seta and capsule — in both groups
- Classic moss examples such as Funaria, Polytrichum and Sphagnum
Read each question carefully: several options are deliberately close, and the distinction often lies in a single structural detail. Aim for accuracy over speed.
Q1. Bryophytes are commonly described as amphibians of the plant kingdom because they:
The source states bryophytes can live in soil but are dependent on water for sexual reproduction, which is why they are called amphibians of the plant kingdom.
Q2. The plant body of a bryophyte is attached to the substratum by:
Bryophytes lack true roots, stems and leaves; they are anchored by unicellular or multicellular rhizoids.
Q3. The main plant body of a bryophyte is haploid and produces gametes. It is therefore called a:
The main plant body is haploid and produces gametes, hence it is called a gametophyte.
Q4. The male sex organ of bryophytes, which produces biflagellate antherozoids, is the:
The antheridium is the male sex organ and produces biflagellate antherozoids.
Q5. The female sex organ of bryophytes is flask-shaped and produces:
The archegonium is flask-shaped and produces a single egg.
Q6. The plant body of a liverwort such as Marchantia is best described as:
The liverwort plant body is thalloid; the thallus is dorsiventral and closely appressed to the substrate, as in Marchantia.
Q7. Liverworts typically grow in which of the following habitats?
Liverworts grow usually in moist, shady habitats such as banks of streams, marshy ground, damp soil, bark of trees and deep in the woods.
Q8. Gemmae in liverworts are best described as:
Gemmae are green, multicellular, asexual buds which develop in small receptacles called gemma cups located on the thalli.
Q9. Gemma cups are:
Gemmae develop in small receptacles called gemma cups located on the thalli.
Q10. Which of the following is a correct statement about asexual reproduction in liverworts?
Asexual reproduction in liverworts takes place by fragmentation of thalli, or by the formation of specialised structures called gemmae.
Q11. The sporophyte of a liverwort is differentiated into:
The liverwort sporophyte is differentiated into a foot, seta and capsule; spores are produced within the capsule after meiosis.
Q12. In liverworts, spores are produced within the capsule:
After meiosis, spores are produced within the capsule; these spores germinate to form free-living gametophytes.
Q13. During sexual reproduction in liverworts, the male and female sex organs are produced:
The source states that male and female sex organs are produced either on the same or on different thalli.
Q14. The first stage of the moss gametophyte, which develops directly from a spore, is the:
The first stage is the protonema stage, which develops directly from a spore; it is creeping, green, branched and frequently filamentous.
Q15. The leafy stage of a moss develops:
The second stage, the leafy stage, develops from the secondary protonema as a lateral bud.
Q16. The leafy shoots of mosses are described as:
The leafy stage consists of upright, slender axes bearing spirally arranged leaves, attached to the soil through multicellular and branched rhizoids.
Q17. In mosses, the antheridia and archegonia are produced:
In sexual reproduction of mosses, the sex organs antheridia and archegonia are produced at the apex of the leafy shoots.
Q18. Compared with the sporophyte of liverworts, the sporophyte of mosses is:
The source states that the sporophyte in mosses is more elaborate than that in liverworts, and that mosses have an elaborate mechanism of spore dispersal.
Q19. Vegetative reproduction in mosses takes place by:
Vegetative reproduction in mosses is by fragmentation and budding in the secondary protonema.
Q20. Which of the following is a correct list of common moss examples given in the lesson?
The common examples of mosses are Funaria, Polytrichum and Sphagnum; Marchantia is a liverwort, while the other options list algae or pteridophytes.