Question

Life cycle of Ectocarpus and Fucus respectively are 

(a) haplontic, diplontic 

(b) diplontic, haplodiplontic 

(c) haplodiplontic, diplontic 

(d) haplodiplontic, haplontic

Answer 1

Correct option is (c) haplodiplontic, diplontic

Ectocarpus and Fucus respectively show haplodiplontic and diplontic life cycle. In Ectocarpus, sporic meiosis occurs and haploid biflagellate meiozoospores are formed. They germinate to produce gametophytic thalli. The gametophytes liberate gametes which fuse to form diploid zygote which gives rise to a diploid plant. In Fucus, there is a single somatic phase. It is diploid and produces haploid gametes. They fuse during fertilisation to give rise to diploid individual.