NEET BIOLOGY

Detailed explanation-1: -This life cycle is found in some algae and all plants. Species with alternation of generations have both haploid and diploid multicellular stages. The haploid multicellular plants (or algae) are called gametophytes, because they make gametes using specialized cells.

Detailed explanation-2: -In the majority of algae and fungi, all structures are haploid except the zygote which is diploid. The haploid phase is called the gametophytic phase, whereas the diploid stage in the life cycle is called the sporophytic phase.

Detailed explanation-3: -Alternation of generations is a type of life cycle having both a diploid and haploid multicellular stage. Alternation of generations also called heterogenesis or metagenesis is a type of life cycle taking place in some algae and plants.

Detailed explanation-4: -Most fungi and algae employ a haploid-dominant life cycle type in which the “body” of the organism is haploid; specialized haploid cells from two individuals join to form a diploid zygote.

Detailed explanation-5: -The three types of the biological life cycle are haplontic, diplontic and haplodiplontic life cycle. The brown algae Fucus shows a diplontic life cycle. The haplontic life cycle is seen in most green algae. Some algae such as Ulva, Polysiphonia, Ectocarpus, Kelps have a haplodiplontic life cycle.