Question

Which one is not a characteristic feature of Asteraceae?
(a)Cypsela fruit
(b)Syngenesious stamens
(c)Ovary carpellary superior
(d)Placentation marginal
(e)Head type inflorescence
(A)a,b only
(B)c and e only
(C)e only
(D)c and d only
(E)b,c and d only

Answer 1

Asteraceae are a widespread family of flowering plants that are characterized by their dense heads. These are annual or perennial herbs but sometimes can be shrubs, vines, and trees as well.

Complete answer:
Here, the characteristics of Ovary bicarpellary stamens and Placentation marginal are not of the family Asteraceae.
Asteraceae is a very large and widespread family of angiosperms that include over 32000 accepted species. In the members of this family, the fruit is called a cypsela which is an achene fruit with one locule and one seed per fruit. They usually possess 5 stamens fused to the corolla and with Syngenesious anthers. The unique structure of the inflorescence of these plants is characteristic features of Asteraceae. These are specialized composite flower heads known as the capitulum.

Additional information:
Below are some other characteristic features of Asteraceae:
-Roots are mainly taproots but can be fibrous sometimes.
-Stems are generally aerial, branched cylindrical fleshy, or wooden but some species possess underground stems in the form of rhizomes.
-The leaves of these plants can be alternate, opposite, or whorled and maybe simply deeply lobed otherwise incised.
-The inflorescence may appear as a single flower from a distance but are actually individual strap-shaped flowers known as ray flowers.

So, the correct answer is "c and d only".

Note: The floral heads of the Asteraceae family are what make them unique from other families of flowering plants. In the case of these flowers, what appears to be a single flower from a distance is actually a composite of smaller flowers known as ray flowers or disc flowers depending on its shape. The cluster of these flowers which appears to be a single flower is called a ‘head’.