Germinating tomato

A reader has sent us this pic of a cut tomato that he left on the ground for a while and when he opened it he found the seeds had started to germinate, inside the fruit. Has anyone got any ideas as what causes this?

Big bean

We received the following e-mail from Pam Sawyer:

It seems that again I must write to you on behalf of one of my friends.
This time their Grandson planted a bean in a jam jar as a school project, it began to grow and then the lad along with his parents left for the U.K.
My friend later transplanted the now growing bean into a larger garden pot and trailed it along the house wall.
Well, it bore a single 'fruit' as per the attached,. We are all now wondering if it is a variation of the 'Jack and the Beanstalk' bean, especially as it is so large and also since it is the only bean to have grown on the plant.
Perhaps you could throw some light on this puzzling bean.
Many thanks for your magazine and the useful advice and help that you provide.

Anyone out there have any ideas?