Plastids are double membrane bounded pigement containing organelles found in plants and some green algae.
Plasmid is small fregment of extra genetie material double stranded DNA. It is self replicating and not associated with growth and metabolism. Plasmids serve as vectors in genetic engineering.
STB Pg 102.Hence, option B is correct.
Nucleoid is a prokaryotic nucleus containing genetic material DNA in the form of a single circular molecule aggregates as an irregularly shaped dense structure called chromatin body or bacterial-chromosome. There is total absence of nuclear membrane, nucleoplasm and nucleolus.
They are hollow, filamentous appendages smaller than flagella. They help in conjugation and not in locomotion.
Option D is pili not pills.
Plasmid is small fregment of extra genetie material double stranded DNA. It is self replicating and not associated with growth and metabolism. Plasmids serve as vectors in genetic engineering.
STB Pg 102.Hence, option B is correct.