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प्रश्न
Describe the formation of helobial endosperm
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उत्तर
Helobial type of endosperm:
a. It is an intermediate between nuclear and cellular type of endosperm.
b. First division of primary endosperm nucleus is followed by (division of cytoplasm) wall formation.
c. The wall formation results in the central cell being divided into a large micropylar and a small chalazal chamber.
d. In both the chambers the development occurs as seen in nuclear type.
e. This type is generally seen in Helobiae series of monocots, hence the name ‘Helobial Endosperm’.
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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.
Describe the development of endosperm after double fertilisation in an angiosperm.
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.
At what stage of endosperm development, will you observe nuclear or cellular type of endosperm?
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 ______.
Mark the odd one.
Which of the following statements are true related to Seed X and Y?
 |
 |
| SEED X | SEED Y |
- Seed X is dicot and endospermic or albuminous.
- Seed X is dicot and non-endospermic or non-albuminous.
- Seed Y is a monocot and endospermic or albuminous.
- Seed Y is a monocot and non-endospermic or non-albuminous.
Choose the correct option with the respect to the nature of the seed.
Why does the zygote begin to divide only after the division of Primary endosperm cell (PEC)?
