Tag: classification of plants

Questions Related to classification of plants

The characters of thallophyta is/are

biology classification of plants thallophyta cryptograms kingdom plantae

  1. Plant body is thallus.

  2. Non-vascular plant.

  3. Sex organs are unicellular and without jacket of sterile cell.

  4. All of the above.

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Correct Option: D
Explanation:

Thallophytes lack differentiation of plant body into the stem and leaves. The plant body is called as a thallus. They lack vascular tissue, the sex organs are unicellular and when multicellular, all are fertile. Thus, the correct answer is option D.

The name 'Thallophyta' was coined by

biology classification of plants thallophyta cryptograms kingdom plantae

  1. Endlicher

  2. Linneaus

  3. Christenson

  4. Hackel

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Correct Option: A
Explanation:

The term Thallophyta was coined by Endlicher. The organisms included in Thallophyta are algae, fungi, slime mould and bacteria.
Linneaus gave biological classification.
Hackel contributed in the history of evolutionary theory. He proposed a link between ontogeny and phylogeny.
Christensen contributed in physics in diagnostic radiology.

Thus, the correct answer is option A.

Plants without well differentiated stem, root and leaf are kept in 

biology classification of plants thallophyta cryptograms kingdom plantae

  1. Thallophyta

  2. Angiosperm

  3. Pteridophyta

  4. Gymnosperm

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Correct Option: A
Explanation:
Thallophyta is the simplest of plants that do not have a well-differentiated body design. For example, Algae do not have leaves, stems or roots.
Pteridophyta includes fern plants which possess the plant body differentiated into stem, leaves, and roots. They also possess naked embryos in the form of spores underneath the leaf.
Gymnosperms were the first plants to have a seed habit. These are the plants which possess naked seeds. For example, Pinus, cycas and other coniferous trees are gymnosperms.
Angiosperms are highly evolved plants with flowers, fruits, and seeds. They are also called as flowering plants. These plants possess seeds enclosed inside the fruit. The seed germinates develops into a new plant. Angiosperms are divided into two groups, namely, monocots and dicots based on the number of cotyledons that they have.

Life cycle is haplontic in

biology classification of plants thallophyta cryptograms kingdom plantae

  1. Funaria

  2. Ulothrix

  3. Selaginella

  4. Pinus

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Correct Option: B

The chloroplast in Ulothrix is

biology classification of plants thallophyta cryptograms kingdom plantae

  1. Spiral

  2. Laminate

  3. Star shaped

  4. Girdle shaped

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Correct Option: D

Which of the following is the principal pigment of Phaeophyceae?

biology classification of plants thallophyta cryptograms kingdom plantae

  1. Phycocyanin

  2. Phycoerythrin

  3. Fucoxanthin

  4. Chlorophyll

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Correct Option: C
Explanation:

Fucoxanthin is a xanthophyll, with formula CHO. It is found as an accessory pigment in the chloroplasts of brown algae and most other heterokonts, giving them a brown or olive-green color. It is the principal pigment of Phaeophyceae.
Phycocyanin is a pigment-protein complex from the light-harvesting phycobiliprotein family, along with allophycocyanin and phycoerythrin. It is an accessory pigment to chlorophyll. All phycobiliproteins are water-soluble, so they cannot exist within the membrane-like carotenoids. 

Phycoerythrin (PE) is a red protein-pigment complex from the light-harvesting phycobiliprotein family, present in red algae.
Therefore, the correct answer is option C.

Spirogyra is commonly called as pond silk because

biology classification of plants thallophyta cryptograms kingdom plantae

  1. Silk is manufactured from it

  2. It looks like a thread

  3. It is slimy to touch

  4. All of the above

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Correct Option: C
Explanation:

Pond silk is the common name of Spirogyra (algae) because it is very slimy.
Spirogyra is a  genus (about 400 species) of freshwater green algae which are found in shallow ponds, ditches and amongst vegetation at the edges of large lakes, generally growing free-floating.
Cells are joined end-to-end in an unbranched, largely unspecialised, stiff filament and are cylindrical with one or two spirally-wound chloroplasts on which many pyrenoids are borne. The cell wall is of two layers, the outer of cellulose and the inner of pectin. Filaments can be several centimeters in length. It generally has a rather silky feel and a shiny green colour.

Plants with hidden reproductive organ are called as

biology classification of plants thallophyta cryptograms kingdom plantae

  1. Gymnosperms

  2. Cryptogamae

  3. Phanerogams

  4. All of the above

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Correct Option: B
Explanation:

Cryptogamae means hidden reproduction, referring to the fact that no seed is produced, thus cryptogams represent the non-seed bearing plants. A cryptogam is a plant that reproduces by spores, without flowers or seeds. 

Gymnosperm are any vascular plant that reproduces by means of an exposed seed, or ovule. Unlike angiosperms, or flowering plants, whose seeds are enclosed by mature ovaries, or fruits, the seeds of many gymnosperms are borne in cones and are not visible until maturity. 
Phanerogams are any plant that produces seeds (rather than spores).
Therefore, the correct answer is option B.

In Ulothrix, meiosis takes place in 

biology classification of plants thallophyta cryptograms kingdom plantae

  1. Cells of the filament

  2. Holdfast

  3. Zygote

  4. Zoospores

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Correct Option: C
Explanation:

Ulothrix being an haploid organism, shows zygotic meiosis. Zygote is the only diploid structure which undergoes meiosis to form four cells. Each develops into Ulothrix.

Which of the following is an example of division Thallophyta?

biology classification of plants thallophyta cryptograms kingdom plantae

  1. Ulothrix

  2. Funaria

  3. Riccia

  4. Adiantum

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Correct Option: A
Explanation:

Ulothrix is an example of division Thallophyta, while Funaria and Riccia are example of Bryophyta and Adiantum is an example of Pteridophyta.