Question

What is the aestivation of Brassica campestris?

• A. Valvate Aestivation
• B. Twisted Aestivation
• C. Imbricate Aestivation
• D. Vexillary Aestivation

Answer 1

Answer: (A), (C)

Imbricate Aestivation

The correct options are A and C.

Explanation of the correct option:

1. The arrangement of petals and sepals in a flower is termed aestivation.
2. Brassica campestris, which comes under the family Brassicaceae, exhibits both imbricate and valvate aestivation.
3. In imbricate aestivation, the sepals are four in number and are aligned in two whorls of two.
4. On the other hand, in valvate aestivation, the petals are also four in number, however, are aligned in single whorls in alternation with the sepals.

Explanation of the incorrect option:

Option B:

1. When one petal margin overlays the margin of the next, it is known as twisted aestivation.
2. This provides a twisted look to the corolla.
3. For example, Hibiscus.

Option D:

1. A specific arrangement in which the other smaller petals are enveloped by one large petal is termed vexillary aestivation.
2. Such a kind of aestivation is witnessed in the majority of pea flowers.

Final answer: In Brassica campestris, both valvate and imbricate aestivation are found.