Explain the development of embryo in a dicotyledonous plant with neatly labelled diagrams
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Answer:
Stages in dicot embryo development: The zygote undergoes transverse division forming a large basal cell and a small apical or terminal cell. The large basal cell enlarges and undergoes transverse division to from a group of 6–10 cells called suspensor. The first cell of the suspensor towards the micropylar end is called haustorium, whereas the last cell of the suspensor toward the chalazal end is called hypophysis that later develops into radicle. The smaller terminal or apical cell undergoes one vertical division. The two cells formed from terminal cell divide by a transverse division thus forming four embryonal cell (quadrant stage). Finally these four cells divide vertically forming 8-celled proembryo (octate stage). Four cells at the apex give rise to plumule and another four give rise to hypocotyl except its tipRead more on Sarthaks.com - https://www.sarthaks.com/357621/describe-the-stages-in-embryo-development-in-a-dicot-plant
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Answer:
Development of a dicot embryo (i) Embryo formation starts after a certain amount of endosperm is formed. (ii) Zygote divides by mitosis to form a proembryo. (iii) Formation of globular and heart-shaped embryo occurs, which finally becomes horse shoe-shaped forms a mature embryo. (iv) In dicot plants, embryo consists of two cotyledons and an embryonal axis between them.(v) The portion of embryonal axis above the level of attachment of cotyledons is epicotyl and it terminates in the plumule. (vi) The portion of embryonal axis below the level of attachment of cotyledon is the hypocotyl, it becomes radicle (root tip). The embryonic stages during the development of a mature embryo sac are:
(a) Fertilised embryo sac showing zygote and Primary Endosperm Nucleus (PEN).
(b) Stages in embryo development in a dicot