Seeds of Tomato are tiny and hence they can be scattered in the juicy pulp. then in the pea seeds are large enough to be arranged in rows. It would be difficult to get them scattered in the pulp(if ever pea had).
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plese give some biological reason it is from chap reproduction
Pea is a plant which can be dispersed by needs to be arranged in row so it can easily be dispersed than scattered like tomato