describe various types of endosperm and example
Answers
Answer:
Three main types of endosperm development in flowering plants are: (i) Nuclear type (ii) Cellular type and (iii) Helobial type! The formation of endosperm is initiated by mitotic divisions of the primary endosperm nucleus (3N). The formation of endosperm occurs usually prior to the zygotic division.
Explanation:
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Answer:
there are 3 types of endosperm
they are nuclear, cellular and helobial
In the nuclear type of endosperm development, the primary endosperm nucleus divides by repeated mitotic free nuclear divisions without the formation of walls. It results in the formation of a large number of free nuclei in the central cell of the embryo sac.
eg:-Cotton, Zeamays, Capsella
Cellular Endosperm: It is not very common. In this type of development, division of PEN (karyokinesis) is followed by cytokinesis and two cells are formed due to transverse division, giving rise to the chalazal and micropylar chamber. Further division is similar, which leads to the formation of the cellular endosperm. Examples: Petunia, Balsam, Datura
Helobial Endosperm: This type of endosperm development is common in monocotyledons. The first division is similar to cellular endosperm and results in a large micropylar cell and small chalazal cell. The chalazal cell mostly does not divide further and functions as a base cell. The micropylar cell divides further, similar to nuclear endosperm. So it is an intermediate type, a combination of both nuclear and cellular endosperm. Examples: Eremurus