(i)Embryo development occurs after endosperm development in angiosperms. (ii) The three methods of endosperm development are: (a) nuclear type (b) cellular type (c)helobial type (iii) Nuclear type is the common method in which triploid Primary Endosperm Nucleus (PEN) undergoes repeated mitotic division without cytokinesis. This stage is called free-nuclear endosperm. (iv) Cell wall formation starts from the periphery and the endosperm becomes completely cellular, e.g. coconut, rice, etc. (v) Cells of the endosperm store food materials. (vi) Endosperm may be completely utilised by the developing embryo before the maturation of seeds as in pea, bean, mustard, etc. These seeds are called non-albuminous or endospermic seeds. (vii) In seeds like castor, maize, coconut, rice, etc., a portion of it may remain in the mature seeds, such seeds are called albuminous or endospermic seeds
Answers
Nagraj
(i)Embryo development occurs after endosperm development in angiosperms.
(ii) The three methods of endosperm development are:
(a) nuclear type (b) cellular type (c)helobial type
(iii) Nuclear type is the common method in which triploid Primary Endosperm Nucleus (PEN) undergoes repeated mitotic division without cytokinesis. This stage is called free-nuclear endosperm.
(iv) Cell wall formation starts from the periphery and the endosperm becomes completely cellular, e.g. coconut, rice, etc.
(v) Cells of the endosperm store food materials.
(vi) Endosperm may be completely utilised by the developing embryo before the maturation of seeds as in pea, bean, mustard, etc. These seeds are called non-albuminous or endospermic seeds.
(vii) In seeds like castor, maize, coconut, rice, etc., a portion of it may remain in the mature seeds, such seeds are called albuminous or endospermic seeds