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प्रश्न
Why does the zygote begin to divide only after the division of Primary endosperm cell (PEC)?
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उत्तर
The zygote needs nourishment during its development. As the mature, fertilised embryo sac offers very little nourishment to the zygote, the PEC divides and generates the endosperm tissue which nourishes the zygote. Hence, the zygote always divides after division of PEC.
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संबंधित प्रश्न
Describe the development of endosperm after double fertilisation in an angiosperm.
______ is the first cell of female gametophytic generation in angiosperms.
Identify the CORRECT statement/s from the following.
i. In post-fertilization changes within the ovule, the development of embryo is followed by the development of endosperm.
ii. Helobial endosperm is intermediate between cellular and nuclear type endosperm.
iii. Helobial endosperm is mostly observed in 72 families of dicots.
At what stage of endosperm development, will you observe nuclear or cellular type of endosperm?
Ex-albuminous seeds differ from albuminous seeds in ____________.
In dicots, the pollen grains are usually ______
A diploid female plant and a tetraploid male plant are crossed. The ploidy of endosperm shall be ______.
In angiosperms, triple fusion is required for the formation of ______.
If an angiospermic male plant is diploid and female plant tetraploid, the ploidy level of endosperm will be ______.
The endosperm of gymnosperms is ______.
Double fertilization leading to initiation of endosperm in angiosperms require ______.
If the endosperm cell of an angiosperm contains 24 chromosomes, the number of chromosomes in the root tip cells will be ______.
The cells of endosperm have 24 chromosomes. What will be the number of chromosomes in the gametes?
Mark the odd one.
Mark the odd one.
The type of evolution where the central part is occupied by free nuclear and the peripheral part by cells is observed in ______.
In angiosperm, the haploid, diploid and triploid structures of a fertilized embryo sac sequentially are ______.
