Question

The plant is called helobial, when there is a type of endosperm development which is intermediate between the nuclear and cellular types?
A. Limnophyton
B. Vallisneria
C. Eremurus
D. All of the above

Answer 1

Hint: Helobial endosperm is an intermediate between nuclear and cellular types because its formation is a type of endosperm formation. The endosperm formation takes place when a cell wall is laid down between the first two nuclei, then one half of the formation occurs, develops endosperm along with the cellular pattern, and another half along with the nuclear pattern.

Complete answer:
> Option (A) is Limnophyton
Limnophyton is a genus from the family Alismataceae. It comprises five species from the Old World tropics. Three of its species are identified as of May 2014.

> Option (B) is Vallisneria
Vallisneria belongs to the genus of freshwater aquatic plants. It is commonly named eelgrass, tape grass, or Vallis. The genus is widely circulated in tropical and subtropical regions of Asia, Africa, Europe, and North America. Vallisneria is a submerged plant that scatters by runners and sometimes forms tall underwater meadows.

> Option (C) Eremurus
It belongs to the genus of deciduous perennial flowers. It is also referred to as the foxtail lilies or desert candles. They are mostly found in eastern Europe and temperate Asia from Turkey + Siberia to China. The inflorescence of Eremurus looks similar to a long spike or a bottlebrush.

> Option (D)- all of the above is the correct option because Limnophyton, Vallisneria, and Eremurus, all are the types.

Hence, The correct answer is option (D).

Note: In nuclear endosperm formation, repeated free-nuclear divisions take place. And the cell wall formation takes place after the free-nuclear division. In cellular endosperm formation, cell-wall formation is simultaneous with nuclear divisions. In helobial endosperm formation, a cell wall is laid down first between the first two.