21. So it persists in the mature seed. (c) In pea seeds the endosperm is completely consumed during development of embryo and they are called non-endospermic seeds while castor seed has a massive endosperm. Eg: Pea, ground nut. Answer: (b) microspore. Embryo: The micropylarend of the embrysac sac contains zygotes which divide only after the endosperm is formed. 2. castor and coconut) and be used up during seed germination. Endosperm has been consumed almost completely. (iii)The seeds of pea are non-endospermic, while castor seeds are endospermic. castor and coconut) and be used up during seed germination. The cells of endosperm tissue are filled with reserve food materials and are used for the nutrition of the developing embryo. Non albuminous seeds have no residual endosperm as it is completely consumed during embryo development. As the embryo grows, the ESR progressively shrinks, and by early to mid endosperm development (i.e. Some times the endosperm completely consumed by the developing embryo (e.g., pea, groundnut, beans) before seed maturation or it is persist in the mature seed (e.g. Non-endospermic or Exalbuminous seeds : In exalbuminous seeds endosperm is completely consumed by the developing embryo, and the mature seeds are without endosperm. around 12 DAP), there are only vestigial remnants of the ESR at the base of the endosperm. Question 42. The embryonal initial undergoes three successive mitotic divisions to form octant. Answer: In which of the following plants endosperm is completely used up by developing embryo? Pollen grain is a (a) megaspore (b) microspore (b) microspore (d) microsporangium. Endosperm is completely consumed by the developing embryo in (a) pea and groundnut (b) maize and castor (c) castor and groundnut (d) maize and pea. Answer: (a) pea and groundnut. Write the changes a fertilized ovule undergoes within the … Question 41. Eg: Wheat, maize, barley, castor. Endospermic or Albuminous seed : In albuminous seeds, embryo not consumed all endosperm. Write the difference between coleoptile and coleorrhiza. Question 7. Such seeds are called endospermic seeds. The main difference is perisperm is present in seeds and endosperm is present in developing embryo as its reserved food which is completely consumed by is during development. The suspensor helps in pushing the embryo in the endosperm. (a) Pea (b) Castor (c) Coconut (d) Mango (a) Pea. The food is stored in cotyledons. Endosperm may either be completely consumed by the developing embryo (e.g., pea, groundnut, beans) before seed maturation or it may persist in the mature seed (e.g. 15.Differentiate between perisperm and endosperm giving one example of each. Development of dicot embryo: The zygote divides to form two-celled proembryo. The endosperm in pea seeds is consumed completely during embryo development, but endosperm is not utilised in castor seeds. The endosperm is completely consumed by the developing embryo in all of the following except: (1) Pea (2) Groundnut (3) Beans (4) Castor Endosperm may either be completely consumed by the developing embryo (e.g., pea, groundnut, beans) before seed maturation or it may persist in the mature seed (e.g. Albuminous seeds retain, a part of endosperm as it is not completely used up during embryo development. castor and coconut) and be used up during seed germination. The endosperm cells in angiosperms are (a) Diploid [All India 2012] Ans.. 16.LS of a maize grain is given below. -Triploid (3n) endosperm divides and grows-Provides the primary nutritive tissue for developing embryo -In most gymnosperms this is provided by female gametophyte (and nucellus)-In some angiosperms the endosperm may be completely consumed during seed maturation, in others it persists-Many plants form fleshy cotyledons when endosperm is depleted 6.
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