[A]: The pollen sterility has been attributed to the malfunctioning of tapetum.   [R]: Premature
Channel: Doubtnut
Date: 2020-05-03

[A]: The pollen sterility has been attributed to the malfunctioning of tapetum.   [R]: Premature degeneration of the tapetum deprives the developing spores of its nutri- tion.