Plant Kingdom

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HÅPLØ-DÏPLØÑTÏÇ LÏFË ÇÝÇLË

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Both gametophytic and sporophytic stages are multi-cellular and free-

living.

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It is an intermediate condition between haplontic and diplontic life

cycles.

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In bryophytes, haploid gametophyte is dominant, independent,

photosynthetic and alternates with short-lived multicellular sporophyte.

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In pteridophytes, diploid sporophyte is dominant, independent,

photosynthetic and alternates with short-lived multicellular haploid

gametophyte.

Examples: Byrophytes and pteridophytes, alga Ectocarpus, Polysiphonia

and kelps.

Sporophyte

(2n)

Meiosis

Zygote

(2n)

HAPLO-DIPLONTIC

LIFE CYCLE

Gametogenesis

Spores

(n)

Gametophyte

(n)

Syngamy