Do all fruits contain seeds? No, triploid fruits do
not. The seed is a fertilized mature ovule which possess an embryonic plant,
usually stores food material and has a protective coat. After fertilization,
changes occur in various parts of the ovule and transforms into a seed.
Do seeds germinate as soon as they are dispersed
I.
Based on the number of cotyledons present two types
of seeds are recognized.
i.
Dicotyledonous
seed: Seed with two cotyledons.
ii.
Monocotyledonous
seed: Seed with one cotyledon.
II.
Based on the presence or absence of the endosperm
the seed is of two types.
i.
Albuminous or Endospermous seed: The cotyledons are thin, membranous and mature seeds have
endosperm persistent and nourishes the seedling during its early development.
Example: Castor, sunflower, maize.
ii.
Ex-albuminous
or non-endospermous seed: Food is utilized by the developing embryo and so the mature seeds are without
endosperm. In such seeds, colyledons store food and become thick and fleshy.
Example: Pea, Groundnut.
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