The predominant stage of its life cycle is the gametophyte which consists of two stages protonema and leafy stages.
Leafy stage are attached to the soil through unicellular and branched rhizoids.
Sex organs-antheridia and archegonia are produced at the apex of the leafy shoots.
All of the above
D. All of the above
Column-I | Column-II |
---|---|
A. Agar | I. Single cell protein, used as food supplements by space travellers |
B. Algin | II. Red algae |
C. Carrageen | III. Brown algae |
D. Chlorella | IV. Gelidium, Gracilaria Spirullina |
A I; B II; C III; D IV
A IV; B III; C II; D I
A II; B I; C III; D IV
A III; B II; C I; D IV
power of adaptability in diverse habitat.
property of producing large number of seeds.
nature of self pollination.
domestication of man.
archegonia.
lack of vascular tissue.
swimming antherozoids.
independent gametophytes.
(i) is correct, but (ii) and (iii) are incorrect
(i) and (ii) are correct, but (iii) is incorrect
(i) and (iii) are correct, but (ii) is incorrect
(iii) is correct, but (i) and (ii) are incorrect
haploid gametophyte
diploid gametophyte
diploid sporophyte
haploid sporophyte
Column-I | Column-II |
---|---|
(Pattern of life cycle in plant) | (Examples) |
A. Haplontic | I. Bryophytes, Pteridophytes, life cycle Ectocarpus, Polysiphonia, Kelps |
B. Diplontic | II. Seed bearing plants life cycle (Gymnosperm and Angiosperm), Fucus |
C. Haplo-diplontic | III. Many algae (Volvox, life cycle Spirogyra) and some species of Chlamydomonas |
A III; B II; C I
A I; B II; C III
A II; B I; C III
A III; B I; C II
they produce spores.
they lack vascular tissues.
they lack roots.
their sporophyte is attached to the gametophyte.
In angiosperms, each embryo sac has a three-celled egg apparatus one egg cell and two synergids, three antipodal cells and two polar nuclei.
All seed bearing plants i.e., gymnosperms and angiosperms follow dipontic life patterns of plants.
In gymosperms, roots in some genera have fungal association in the form of mycorrhiza (Pinus) while in some others (Cycas) small specialized roots called coralloid are associated with N2 fixing cyanobacteria.
All of the above
gametophytic growth needs cool, damp and shady places.
it requires water for fertilization.
due to absence of stomata in leaf and absence of vascular tissue.
both (a) and (b)
rhodophyceae
bacillariophyceae
chlorophyceae
phaeophyceae
8
4
16
12
Both (i) and (ii)
Both (ii) and (iv)
Both (iii) and (iv)
All of these
Independent sporophyte
Presence of archegonia
Well developed vascular tissues
Independent gametophyte
Only (i)
Both (i) and (ii)
Both (ii) and (iv)
All of these
(i) and (v)
(iii) and (v)
(i) and (ii)
(i) and (iv)
Column-I | Column-II |
---|---|
A. Amphibian of the | I. Sphagnum plant kingdom |
B. Specialized structures | II. Angiosperms in liverworts for asexual reproduction |
C. Monocotyledons and | III. Bryophytes dicotyledons |
D. A plant which has | IV. Gemmae capacity to holding water |
A III; B IV; C I; D II
A III; B IV; C II; D I
A IV; B III; C II; D I
A III; B II; C IV; D I
Spirogyra
Fucus
Volvox
Chlamydomonas
numerical taxonomy
cytotaxonomy
chemotaxonomy
all of the above
Liverworts
Moss
Fern
Gymnosperm
Both statements -1 and statement - 2 are true and statement - 2 is the correct explanation of statement - 1.
Both statements -1 and statement - 2 are true but statement - 2 is not the correct explanation of statement - 1.
Statement -1 is true and statement - 2 is false.
Statement -1 is false and statement - 2 is true.
Since most rhodophyta grow at great depths, the chlorophyll can only absorb light in the red area of the spectrum.
The wavelengths of light that are absorbed by chlorophyll are passed to phycoerythrin (a red pigment).
Red pigment of rhodophyta absorbs all the light waves.
The light reaching the greatest depth in water is in the blue-green region of the spectrum, is absorbed by phycoerythrin.
Chara, Fucus, Polysiphonia
Volvox, Spirogyra, Chlamydomonas
Porphyra, Ectocarpus, Ulothrix
Sargassum, Laminaria, Gracilaria
its contribution to prevent soil erosion.
its contribution in ecological succession.
its capability to remove CO from the atmosphere.
both (a) and (b)
Both (i) and (ii)
Both (ii) and (iii)
Both (i) and (iii)
All of these
Algae
Fungi
Bryophytes
Pteridophytes
Column-I | Column-II |
---|---|
A. Phaeophyceae | I. Have an elaborate mechanism of spore dispersal |
B. Rhodophyceae | II. first terrestrial plant with vascular tissue-phloem and xylem |
C. Mosses | III. Asexual reproduction by biflagellate zoosposes |
D. Pteridophytes | IV. Polysiphonia, Porphyra, Gracilaria |
A III; B IV; C I; D II
A IV; B III; C I; D II
A IV; B III; C II; D I
A IV; B I; C III; D II
Carolus Linnaeus
Bentham and Hooker
Engler and Prantl
R. H. Whittaker
A mechanism for moving water throughout the plant.
A mechanism to prevent desiccation of tissues.
An ability to screen ultraviolet radiation.
Both (b) and (c)
Two
Three
Four
One
morphologically identical haploid and diploid stages.
genetically identical haploid and diploid stages.
alteration of generations between heteromorphic haploid gametophytes and diploid sporophytes.
none of the above