Identify the given structures and select the correction options,

Options

A. `{:(L,M,N),("Aplanospore of Ulothrix","Prothallus (2n) of pteridophyte","Ovule of angiosperm"):}`
B. `{:(L,M,N),("Palmella stage of Ulothrix","Prothallus (n) of pteridophyte","Ovule of gymnosperm"):}`
C. `{:(L,M,N),("Akinetes of Chlamydomonas","Sporophyte (2n) of bryophyte","Endosperm off gymnosperm"):}`
D. `{:(L,M,N),("Palmella stage ofchlamydomonas","Prothallus (n)_ of pteridopyte","Ovule of hymnospermsperm"):}`

Answer

D

Explanation

Figure L shows palmella stage in Chlamydomonas. In chlamydomonas, under unfavourable conditions during zoospore formation, the dughter protoplast are not liberated and the parent cell wall gets gelatinised. As a result these protplasts get embedded in the mucilage thus formed. this stage is known as palmella stage. iot helps the zoospore to survive during unfavourable conditions. when the favourable conditon return, the mucilage dissolves and the daugher protoplasts form zoospores. figure M is of gametophytic photocynthetic, independent, formed by germination of spores and bears antheridia and archegonia. figure N represents L.S. of gymnospermic ovule. it shown haploid female gametophyte (or endosperm), bearing archegonia, microphyle, integument, etc.