Class 11 Biology Plant Physiology Plant Growth and Development
Legume seeds exhibit dormancy because of
Hard seed coat
Absence of cytokinin
Absence of Gibberellic acid
Correct answer: (b)
Solution: Physical dormacy is caused by a hard and impermeable seed coat or fruit enclosure which prevents imbibition and sometimes also gaseous exchange. The phenomenon is sometimes referred to as 'hard seed', because the seed coats remain hard and impermeable during exposure to normal germination conditions. Physical dormacy is mostly known and described from Leguminosae, a family where the majority of the species exhibit this type of dormacy.