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Question
Describe the development of an endosperm in a viable seed. Why does endosperm development precedes embryo development?
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Solution
The endosperm development is a result of triple fusion. During triple fusion, one of the male gametes fuses with the two polar nuclei of the central cell and give rise to primary endosperm cell (PEC). The primary endosperm cell divides repeatedly and forms a triploid endosperm tissue. The most common type of endosperm development is free-nuclear, in which the PEN undergoes successive nuclear divisions to give rise to a number of free nuclei. The endosperm thus formed is called free nuclear endosperm. Subsequently, cell formation occurs and the endosperm becomes cellular.
The endosperm thus developed is required to provide essential nutrients to the growing embryo. Therefore endosperm development occurs before the embryo development.
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Endosperm of angiosperm is __________.
(A) haploid
(B) diploid
(C) triploid
(D) tetraploid
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?
Which of the following triggers an acrosomal reaction of the sperm?
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.
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The diagram given below shows the three types of endosperms in angiosperms.
 |
 |
 |
| Type 1 | Type 2 | Type 3 |
- Identify the three types of endosperms shown above.
- Name the type of endosperm which commonly occurs in polypetalous dicots.
