In imbricate Astevation a petal present which is covered by two adjacent petals and there a another petal which cover the adjacent petals so we can say that petals overlap one another with out any particular direction. hope u understand.

The correct answer is option 'B' - Imbricate.

Explanation:
When the margins of sepals or petals overlap one another without any particular direction, it is referred to as imbricate condition. This condition is commonly observed in plants with whorled or spiral arrangement of sepals or petals.

Let's understand the different terms mentioned in the options:

a) Vexillary: Vexillary refers to a condition where one petal overlaps the other two petals on the sides, while the other two petals overlap the first petal. This condition is commonly seen in flowers of the Fabaceae family, such as peas.

b) Imbricate: Imbricate refers to a condition where the sepals or petals overlap one another without any particular direction. The overlapping arrangement resembles the way shingles or tiles are arranged on a roof. This condition is commonly observed in flowers of the Asteraceae family, such as sunflowers, and also in flowers of the Rosaceae family, such as roses.

c) Twisted: Twisted refers to a condition where the sepals or petals are twisted or spirally arranged. This condition is commonly seen in flowers of the Malvaceae family, such as hibiscus.

d) Valvate: Valvate refers to a condition where the sepals or petals are arranged in a manner similar to the opening and closing of a valve. The margins of the sepals or petals meet at the edges without overlapping. This condition is commonly observed in flowers of the Solanaceae family, such as potato and tomato.

In conclusion, when the margins of sepals or petals overlap one another without any particular direction, the condition is termed as imbricate.