1. Tardigrade
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  4. The plant part which consists of two generations one within the other, is:

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Q. The plant part which consists of two generations one within the other, is:

Punjab PMETPunjab PMET 2006

Solution:

Seed develops from an ovule (consisting integument and nucellus) or megasporangium. Parts of ovule develop a haploid megaspore which grow into haploid female gametophyte. This female gametophyte develops an egg or oospore. The latter is fertilized by a male gamete and develop into a zygote $ (2n) $ . The zygote develops into an embryo or new sporophyte. The embryo $ (2n) $ is surrounded by female gemetophyte $ (n) $ , the latter by seed coat $ (2n) $ . In this way seed wontains three generations locked one within another. Of these, two generations occur within embryo.