Free Plant Kingdom (Daily Quiz: 10) NEET Biology Questions & Answers with Detailed Explanation & Full Review

Answer: (b)

Ginkgo is a gymnosperm.

Answer: (a)

Nostoc belongs to Cyanophyceae. In this entire class sexual reproduction is completely absent. It reproduces by colony formation, hormogonia, akinetes, heterocysts and endospres. However genetic recombination has been observed. It may be probably through transformation or conjugation. The other three algae- Spirogyra, Ulothrix and Volvox belong to Chlorophyceae. The members of this class show isogamous, anisogamous and oogamous type of sexual reproduction.

Answer: (b)

Ectocarpus produces biflagellate gametes. Anabaena is a cyanobacteria and does not reproduce sexually. Spirogyra produces non-flagellated male gamete during conjugation, where entire cell content functions as gamete. Polysiphonia also produces non-flagellated spermatia.

Answer: (b)

A fern plant body is sporophytic (2n) and is differentiated into roots, stems and leaves. On the ventral surface of leaves sporangia are borne in a group called sori. Inside the sporangium are present the spores which are formed by reduction duvsion. Thus the spores produced are haploid in nature and germinate to produce a prothallus that represents the gametophytic generation. Antheridium and archegonium are borne on this prothallus. Thus meiosis takes place at the stage of spore formation.