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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
Angiosperms bearing unisexual flowers are said to be either monoecious or dioecious. Explain with the help of one example each.
Endosperm of angiosperm is __________.
(A) haploid
(B) diploid
(C) triploid
(D) tetraploid
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.
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 ______.
If an angiospermic male plant is diploid and female plant tetraploid, the ploidy level of endosperm will be ______.
Indentify the wrong statement regarding post-fertilisation development.
The cells of endosperm have 24 chromosomes. What will be the number of chromosomes in the gametes?
The type of evolution where the central part is occupied by free nuclear and the peripheral part by cells is observed in ______.
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.
