Which of the following statements is true? [2023]
All pteridophytes exhibit haplo-diplontic pattern.
Seed bearing plants follow haplontic pattern.
Most algal genera are diplontic.
Most bryophytes do not have haplo-diplontic life cycle.
(1)
Pteridophytes exhibit haplo-diplontic pattern in their life cycle. The diploid sporophyte represented by a dominant, independent, photosynthetic, vascular plant body alternates with multicellular, saprophytic or autotrophic, independent but short-lived haploid gametophyte. All seed-bearing plants, i.e., gymnosperms and angiosperms, follow diplontic pattern. Most algal genera are haplontic; some of them, such as Ectocarpus, Polysiphonia, and kelps, are haplo-diplontic, and Fucus is diplontic. All bryophytes have haplo-diplontic life cycle.
Match the plant with the kind of life cycle it exhibits. [2022]
| List-I | List-II |
| (A) Spirogyra | (i) Dominant diploid sporophyte, vascular plant, with highly reduced male or female gametophyte |
| (B) Fern | (ii) Dominant haploid free-living gametophyte |
| (C) Funaria | (iii) Dominant diploid sporophyte alternating with reduced gametophyte called prothallus |
| (D) Cycas | (iv) Dominant haploid leafy gametophyte alternating partially dependent multicellular sporophyte |
Choose the correct answer from the option below:
(A) – (iv), (B) – (i), (C) – (ii), (D) – (iii)
(A) – (ii), (B) – (iii), (C) – (iv), (D) – (i)
(A) – (iii), (B) – (iv), (C) – (i), (D) – (ii)
(A) – (ii), (B) – (iv), (C) – (i), (D) – (iii)
Zygotic meiosis is characteristic of [2017]
Fucus
Funaria
Chlamydomonas
Marchantia
(3)
In Chlamydomonas, zygote divides by meiosis. It exhibits haplontic type of life cycle.
Life cycles of Ectocarpus and Fucus respectively are: [2017]
diplontic, haplodiplontic
haplodiplontic, diplontic
haplodiplontic, haplontic
haplontic, diplontic
(2)
Ectocarpus possesses haplodiplontic whereas Fucus possesses diplontic life cycle.
