1. With a neat labelled diagram describe the
parts of a typical angiospermic ovule.
Answers
Answer:
An ovule is a female megasporangium where the formation of megaspores takes place.
Angiosperm Ovule
The various parts of an ovule are –
(1) Funiculus – It is a stalk-like structure which represents the point of attachment of the ovule to the placenta of the ovary.
(2) Hilum – It is the point where the body of the ovule is attached to the funiculus.
(3) Integuments –They are the outer layers surrounding the ovule that provide protection to the developing embryo.
(4) Micropyle – It is a narrow pore formed by the projection of integuments. It marks the point where the pollen tube enters the ovule at the time of fertilization.
(5) Nucellus – It is a mass of the parenchymatous tissue surrounded by the integuments from the outside. The nucellus provides nutrition to the developing embryo. The embryo sac is located inside the nucellus.
(6) Chalazal – It is the based swollen part of the nucellus from where the integuments originate.
Explanation:
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Answer:
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Explanation:
The diagram of a typical angiosperm ovule is as follows:
An ovule consists of funicle, micropyle, integuments, nucellus, embryo sac, hilum, chalaza etc.
Funicle - It is the stalk of ovule which connects ovule to the placenta. Funicle is short and multicellular.
Hilum - It is the point where funicle connects the main body of the ovule.
Integuments - These are the layers that surround the ovule. There can be outer integument and inner integument. The main function of integuments is to protect the inner tissues.
Micropyle - The opening which is present at the top of integuments is called micropyle. The main function of micropyle is to allow the entry of the pollen tube into the ovule.
Nucellus - Integuments surround parenchymatous tissue which constitutes the main body of the ovule and is called nucellus. The primary function of nucellus is to provide nutrition to the developing embryo.
Chalaza - The swollen part of ovule present opposite to micropyle is called chalaza.
Embryo sac- It is present in the nucellus and it contains female gamete called egg.