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कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

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

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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 Exemplar [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.


Describe the development of endosperm after double fertilisation in an angiosperm.


Describe the development of an endosperm in a viable seed. Why does endosperm development precedes embryo development?


Why does endosperm development precede embryo development in angiosperm seeds?


Identify the characteristic feature/s of helobial endosperm.


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?


If an angiospermic male plant is diploid and female plant tetraploid, the ploidy level of endosperm will 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 ______.


Mark the odd one.


The coconut water from tender coconut is ______


Coconut water contains:


The diagram given below shows the three types of endosperms in angiosperms.

Type 1 Type 2 Type 3
  1. Identify the three types of endosperms shown above.
  2. Name the type of endosperm which commonly occurs in polypetalous dicots.

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?


In angiosperm, the haploid, diploid and triploid structures of a fertilized embryo sac sequentially are ______.


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