Question

Which of the following is the type of placentation seen in sweet pea?
(A) Basal
(B) Axial
(C) Free central
(D) Marginal

Answer 1

Hint: The arrangement of ovules inside the ovary on placenta is termed placentation. Sweet pea scientifically called 'lathyrus odoratus' belongs to family leguminosae or fabaceae and altogether the members of this family the ovary is unilocular and ovules are borne on margin. Now select the answer supported by this from the options given above in the question and match for the correct answer.

Complete answer:
Option A (Basal): the ovary during which the placenta develops from its base and one ovule is attached to the base is said to possess basal placentation. It's found in Marigold and Sunflower.
So, Option A isn't correct.
Option B (Axial): The placenta is axile and therefore the ovules are attached thereto during a multilocular ovary. Examples are China rose Tomato and Orange.
So, Option B isn't correct.
Option C (Free central): In Free central placentation, the ovules develop on the central axis while the septa are absent. This placentation is found in Dianthus and primrose.
So, Option C isn't correct.
Option D (Marginal): The ovary during which the placenta forms a ridge along the ventral suture of the ovary and ovule develops on two separate rows is understood to possess ventral placentation. This kind of placentation is found in peas.
So, Option D is correct.

So, the correct answer is “Option D”.

Note:
In flowering plants, presentation is the attachment of ovules inside the ovary. The ovules inside a flower's ovary (which later become the seeds inside a fruit) are attached via funiculi, the plant structure like a duct. This is a part of the ovary where the funiculus attaches is mentioned as placenta. The placenta of the ovules become the stalk of the seeds later in life.