Read the following statements and answer the question. (i) Sporophytic generation is represented only by the one-celled zygote. (ii) Meiosis in the zygote results in the formation of haploid spores. (iii) The dominant, photosynthetic phase in such plants is free-living gametophyte. (iv) Many algae such as Volvox, Spirogyra and some species of Chlamydomonas represent this pattern. Which of the following pattern of life cycle of plant is described by the above statements ?
D. None of these
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Correct Answer :
Haplontic life cycle is a simplest and most primitive type of life-cycle found in all chlorophyceae. In haplontic pattern of life cycle, the somatic phase (plant) is haploid (gametophyte) while the diploid phase (sporophyte) is represented by zygote. During germination the zygote (2n) divides meiotically producing haploid (n) zoospores, which develop into individual plant. Here the unicellular or filamentous gametophyte (n) alternates with one-celled zygote or sporophyte (2n).