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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
Angiosperms bearing unisexual flowers are said to be either monoecious or dioecious. Explain with the help of one example each.
Describe the development of endosperm after double fertilisation in an angiosperm.
Draw a labelled mature stage of a dicotyledonous embryo.
Endosperm of angiosperm is __________.
(A) haploid
(B) diploid
(C) triploid
(D) tetraploid
Why does endosperm development preceeds that of zygote ?
Why does endosperm development precede embryo development in angiosperm seeds?
In which of the following the primary endosperm nucleus undergoes free nuclear division or karyokinesis?
Identify the ploidy of embryo and endosperm respectively formed after following cross.
An angiospermic male plant with 24 chromosomes in its pollen mother cells is crossed with female plant bearing 24 chromosomes in its root cells.
Identify the characteristic feature/s of helobial endosperm.
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.
Which of the following triggers an acrosomal reaction of the sperm?
At what stage of endosperm development, will you observe nuclear or cellular type of endosperm?
In dicots, the pollen grains are usually ______
Double fertilization leading to initiation of endosperm in angiosperms require ______.
Mark the odd one.
The coconut water from tender coconut is ______
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 ______.
Which of the following plants develops cellular type endosperm?
In a coconut, what do the coconut water and white kernel represent morphologically?
