Question

biobuday socrative question

• which of the following are haploid stages/structures:
• i) antheridia
• ii) protonemata
• iii) sporangia
• iv) archegonia
• v) zygote
• a) i, iii, v
• b) ii, iv, v
• c) i, iii, iv
• d) ii, iii, v
• e) i, ii, iv

Explanation:

• Antheridia: Male reproductive structures in plants (like bryophytes). They are part of the gametophyte generation. Gametophytes are haploid, so antheridia are haploid.
• Protonemata: A filamentous structure in bryophytes (e.g., mosses). It is a part of the gametophyte (haploid) stage.
• Sporangia: In plants, sporangia can be part of the diploid sporophyte (e.g., in ferns, the sporangia on the fronds are part of the diploid sporophyte that produces haploid spores via meiosis). But in some lower - plant contexts (if mis - considered as gametophyte - borne in a wrong model), this is incorrect. The key is that sporangia (in the correct plant - life - cycle understanding) are diploid as they are part of the sporophyte.
• Archegonia: Female reproductive structures (like in bryophytes). They are part of the gametophyte (haploid) generation.
• Zygote: Formed by the fusion of haploid gametes (sperm and egg). A zygote is diploid (\(2n\)).

Answer:

E. i, ii, iv