This is due to the different types of placentation shown by the pea and the tomato plants. Placentation is the term used to describe the type of arrangement of ovules inside the ovary. The pea plant shows Marginal Placentation which means that the ovules are arranged into two rows along the rigid ventricular suture, whereas the tomato plant shows Axileplacentation, that means the ovules are arranged along the central axis of the ovary. Hence, the arrangement.
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