Tag: cryptogams

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Multiple choice botany kingdom plantae uses of bryophytes introduction to bryophytes cryptogams

Funaria is a moss.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Funaria is a genus of moss. In Funaria, rhizoids are present. They are primitive multicellular plants. They are autotrophic plants. They show alteration of generation. They reproduce by spore formation.

Thus, the correct answer is option A.

Multiple choice botany kingdom plantae uses of bryophytes introduction to bryophytes cryptogams

Which of the following statements is incorrect?

  1. Mosses along with lichens are the first organisms to colonise rocks.

  2. Sphagnum is used as packing material for transportation of living material.

  3. In liverworts, spores are produced after meiosis within the capsule.

  4. Funaria possesses unicellular unbranched rhizoids.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Funaria has a radial symmetry with a once branched axis or stem, a number of spirally arranged leaves and branched colourless multicellular rhizoids. The axis is aerial, erect, slender and monopodial branched.

So the correct option is D.

Multiple choice botany kingdom plantae uses of bryophytes introduction to bryophytes cryptogams

Funaria requires water because ___________________.

  1. Fertilisation occurs in water only

  2. Funaria is a hydrophyte

  3. Plants need water for gametogenesis

  4. Gametangia cannot develop without water
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Fertilisation of Funaria occurs in water. The antherozoids are released into the water where they swim and reach archegonium, An antherozoid fuses with the egg to produce the zygote. thus, an external layer of water is essential for the swimming of male gametes to the archegonia.

So the correct option is A.

Multiple choice botany kingdom plantae uses of bryophytes introduction to bryophytes cryptogams

The prominent phase in the life cycle of bryophytes is ___________.

  1. gametophyte

  2. sporophyte

  3. seta

  4. sporogonium
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bryophytes shows two morphologically distinct heteromorphic generations, i.e. gametophytic and sporophytic generations. Gametophytic generation is the dominant phase of life cycle and in general the term 'plant body' is used to represent this phase.

Multiple choice botany kingdom plantae uses of bryophytes introduction to bryophytes cryptogams

While studying a plant, you discover that it has chlorophyll, no xylem. Its multicellulcar sex organs are enclosed in a layer of jacket cells. Its gametophyte Stage is free living. The plant probability belongs to

  1. Chlorophyceae

  2. Bryophyte

  3. Pteridophyte

  4. Gymnosperm
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The life cycle of higher plants is dominated by the sporophyte stage, with the gametophyte borne on the sporophyte. In ferns, the gametophyte is free-living and very distinct in structure from the diploid sporophyte. Pteridophytes also have their multicellular sex organs covered in the multicellular jacket later.

So the correct answer should be option 'Pteridophyte' .

Multiple choice botany kingdom plantae uses of bryophytes introduction to bryophytes cryptogams

In which of the following groups would you place a plant which produces spores and embryos but lacks seeds and vascular tissues?

  1. Fungi

  2. Pteridophytes

  3. Bryophytes

  4. Gymnosperms
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
1. The Plant body is a gametophyte. They grow in areas which arc in between the aquatic and terrestrial habitats i.e. amphibious zone and hence known as amphibious plants.
2. They have thalloid or leafy multi cellular green plant body.
3. The smallest form is microscopic (e.g. Zoopsis). The largest genus recorded so far is an Australian Dawsonia which is about 70 cms in length.
4. The dominant plant body is gametophyte (n) which is independent.
5. The plant body lacks true roots, stem or leaves.
6. Rhizoids - (root like structure) serve the function of roots.
7. The plants are green and possess chloroplasts.
8. They show autotrophic mode of nutrition.
9. Vascular tissues are completely absent.
10. Sexual reproduction is oogamous.
11. Sex organs are multi cellular and jacketed.
12. Male reproductive organ is known as antheridium. It is a club shaped structure being borne by a narrow stalk. It produces biflagellate and motile male gametes or antherozoids.
14. The female sex organ is known as archegonium. It is a flask shaped structure having a swollen base and a narrow neck.
15. Water is essential for fertilization.
16. The diploid zygote undergoes repeated divisions to form a multi cellular sporophyte.
17. Sporophyte is dependent on the gametophyte for nutrition.
18. Sporophyte generally consists of foot, seta and capsule. It produces haploid spores (homospores).
19. Spores on germination give rise to gametophyte plant.
20. Gametophyte and sporophyte differ in form which alternate with each other, thus heterologous alternation of generation is seen in Bryophytes.
Multiple choice botany kingdom plantae uses of bryophytes introduction to bryophytes cryptogams

Bryophytes are the first land plants but incompletely adapted to land conditions as______________________

  1. Plant body is parenchymatous

  2. Protonema is present

  3. Male gametes are motile

  4. Stomata are absent
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Certain features in bryophytes are not completely supporting the life of bryophytes on land like:

  • Absence of stomata
  • The plant body lacks true roots, stem or leaves
  • Vascular tissues are completely absent.
  • Water is essential for fertilization.