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Why does the zygote begin to divide only after the division of Primary endosperm cell (PEC)? - Biology

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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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पाठ 2: Sexual Reproduction in Flowering Plants - SHORT ANSWER [पृष्ठ १५]

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एनसीईआरटी एक्झांप्लर Biology [English] Class 12
पाठ 2 Sexual Reproduction in Flowering Plants
SHORT ANSWER | Q 8. | पृष्ठ १५

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संबंधित प्रश्‍न

Some organisms suspend their metabolic activities to survive in unfavourable conditions. Explain with the help of any four examples.


Angiosperms bearing unisexual flowers are said to be either monoecious or dioecious. Explain with the help of one example each.


Draw a labelled mature stage of a dicotyledonous embryo.


Endosperm of angiosperm is __________.

(A) haploid

(B) diploid

(C) triploid

(D) tetraploid


______ is the first cell of female gametophytic generation in angiosperms.


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.


Ex-albuminous seeds differ from albuminous seeds in ____________.


A diploid female plant and a tetraploid male plant are crossed. The ploidy of endosperm shall be ______.


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 coconut water from tender coconut is ______


Coconut water contains:


The type of evolution where the central part is occupied by free nuclear and the peripheral part by cells is observed in ______.


The number of chromosomes in the leaf cells of a male plant is 40 and in the stem cells of a female plant is 60. If they are artificially hybridised, what will be the number of chromosomes in the endosperm?


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