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Q.

Which of the following structures is basically diploid?

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a

Protonema

b

Prothallus

c

Proembryo

d

Pollen grain

answer is D.

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Detailed Solution

Prothallus is haploid gametophyte in pteridophytes 

Pollengrain is haploid male gametophyte in gymnosperms and angiosperms. 

Protonema is haploid juvenile gametophytic stage of mosses. 

Proembryo is one of the early developing embryo stages in angiosperms and it is diploid

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Which of the following structures is basically diploid?