Question

Why seeds in pea are arranged in a row and tomato in centre

Answer 1

In pea, fruit is legume. The pea pod is developed from monocarpellary, unilocular and half superior ovary. At maturity, the fruit splits along the dorsal and ventral sutures and discharge its seeds .In gynoecium with single carpel, ovules are always attached to the ventral suture. This results in the fruit with marginal placentation. Thus, the seeds are arranged in a row in legume (pea) pod. In tomato, the fruit is berry. It is fleshy fruit develop from superior or inferior ovary. In this, the margins of the carpels grow inward to the centre of the ovary dividing the central chamber into compartments called locules. So that, the ovules are arranged radially on the axis, attached by placenta that is called axial placentation. That's the reason the seeds are embedded in the juicy pulp.

Answer 2

Placentation in pea and tomato plants are different. In pea plant ovules are arranged in a row in the ovary while in tomato plant they are scattered in the ovary. After fertilisation the ovary converts into the fruit while the ovules convert into seeds, thus occupying the same positions.

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