Question

In Dianthus, placentation is
A. Basal
B. Marginal
C. Axile
D. Free Central

Answer 1

Hint: Inside the ovary, the developing embryo derives all its nutrition and basic amenities from the parent body, so it remains connected to the body. A flower is belonging to the family Caryophyllaceae with the flowers having five petals, typically with a frilled or pinked margin. It is observed in Primrose.

Complete answer:
As we know that the Placentation is the arrangement of the placenta in the ovary of the flower. The placenta connects the ovule with the walls of the ovary.
Now, we consider the type of placentation are: -
> Basal placentation: - In Basal placentation, the placenta develops from its base and a single ovule is found attached to the base. Basal placentation is found in the Asteraceae family which have marigolds and sunflowers.
> Marginal placenta ion: - In Marginal placentation, the placenta forms a ridge along the ovary and the ovules develop on it making two separate rows. Generally, it is found in the pea plants.
> Axile placentation: - In Axile placentation, the placenta lies on a central axis and ovules are attached to it. The ovary is segmented by fibrous septa. Axile placentation is found in the Chinese roses, in tomato and in the lemon.
> Free central placentation: - In this type of placentation, the ovules are present on the central axis and in this placentation no formation of septa is there. Free central placentation is found in the Dianthus and primrose.

Hence, the correct option is D.

Note: The ovules inside a flower’s ovary are attached via funiculi, the part like a duct in citizenry. The part of the ovary where the funiculus attaches is understood because the placenta. Placentation is supposed for the transfer of nutrients, respiratory gases and water from maternal tissue to the growing embryo and also for the removal of waste from the embryo.