Plant Kingdom
- Which of the following is true about bryophytes?
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Bryophytes are non vascular embryophytes characterized by the presence of an independent gametophyte and a parasitic sporophyte. Plant body is either thalloid or foliose. Archegonium is the flask shaped female sex organ. They bear chloroplast.
Correct Option: D
Bryophytes are non vascular embryophytes characterized by the presence of an independent gametophyte and a parasitic sporophyte. Plant body is either thalloid or foliose. Archegonium is the flask shaped female sex organ. They bear chloroplast.
- In bryophytes and pteridophytes, transport of male gametes requires
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Bryophytes neither have pollen nor flowers and rely on water to carry the male gametes (sperm) to the female gametes (eggs). The antherozoids (male gametes of pteridophytes) are armed with hair-like or whip-like cilia or flagellae and are able to swim through water; they do not travel great distances and are only released when free water is available.
Correct Option: D
Bryophytes neither have pollen nor flowers and rely on water to carry the male gametes (sperm) to the female gametes (eggs). The antherozoids (male gametes of pteridophytes) are armed with hair-like or whip-like cilia or flagellae and are able to swim through water; they do not travel great distances and are only released when free water is available.
- The plant body is thalloid in
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The plant body of a liverwort is haploid (n), gametophytic, small, dorsoventrally flattened, thallose, dichotomously branched fixed by unicellular and unbranched rhizoids, e.g., Marchantia.
Correct Option: D
The plant body of a liverwort is haploid (n), gametophytic, small, dorsoventrally flattened, thallose, dichotomously branched fixed by unicellular and unbranched rhizoids, e.g., Marchantia.
- Selaginella and Salvinia are considered to represent a significant step towards evolution of seed habit because :
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Selaginella and Salvinia are advanced pteridophytes.
Correct Option: D
Selaginella and Salvinia are advanced pteridophytes.
- Sperms of both Funaria and Pteris were released together near the archegonia of Pteris. Only its sperms enter the archegonia as
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Archegonia of a particular species recognises antherozoids (sperms) of the same species through release of chemical. In Pteris, archegonia produces malic acid which attracts sperms of Pteris only for fertilization.
Correct Option: D
Archegonia of a particular species recognises antherozoids (sperms) of the same species through release of chemical. In Pteris, archegonia produces malic acid which attracts sperms of Pteris only for fertilization.