label the parts of seeds
Answers
Answer: - Types of Seeds
A Seed is primarily of two types. The two types are:
Monocotyledonous Seed
Dicotyledonous Seed
Let us now study about these types of seeds in brief.
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The Seed
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Structure of a Monocotyledonous Seed
A Monocotyledonous seed, as the name suggests, has only one cotyledon. There is only one outer layering of the seed coat. A seed has the following parts:
Seed Coat: In the seed of cereals such as maize, the seed coat is membranous and generally fused with the fruit wall, called Hull.
Endosperm: The endosperm is bulky and stores food. Generally, monocotyledonous seeds are endospermic but some as in orchids are non-endospermic.
Aleuron layer: The outer covering of endosperm separates the embryo by a proteinous layer called aleurone layer.
Embryo: The embryo is small and situated in a groove at one end of the endosperm.
Scutellum: This is one large and shield-shaped cotyledon.
Embryonal axis: Plumule and radicle are the two ends.
Coleoptile and coleorhiza: The plumule and radicle are enclosed in sheaths. They are coleoptile and coleorhiza.
Learn more about the Morphology of Flower here.
Structure of a Dicotyledonous Seed
Unlike monocotyledonous seed, a dicotyledonous seed, as the name suggests, has two cotyledons. It has the following parts:
Seed coat: This is the outermost covering of a seed. The seed coat has two layers, the outer testa and the inner tegmen.
Hilum: The hilum is a scar on the seed coat through which the developing seed was attached to the fruit.
Micropyle: It is a small pore present above the hilum.
Embryo: It consists of an embryonal axis and two cotyledons.
Cotyledons: These are often fleshy and full of reserve food materials.
Radicle and plumule: They are present at the two ends of the embryonal axis.
Endosperm: In some seeds such as castor, the endosperm formed as a result of double fertilisation, is a food storing tissue. In plants such as bean, gram and pea, the endosperm is not present in the matured seed. They are known as non-endospermous.
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Explanation:
Explanation:
seeds have mainly seven parts :-
plumule
epicotyl
tegmen
testa
hypocoty
radical
cotyledon