Could the rūpa which we call 'dead matter' and the rūpa we call 'plant' be
produced by kamma? A plant is not 'born' because a plant cannot perform
good and bad deeds; it has no kamma that could cause its birth. Temperature
is the condition for the life of a plant. As regards human beings, kamma
produces rūpa at the moment the patisandhi-citta arises. There couldn’t be
life if kamma did not produce rūpa from the first moment of life. There are
four factors which produce different rūpas of the body. As we have seen
kamma is one factor. The other factors are: citta, temperature and nutrition.
Kamma produces rupa at the moment the patisandhi-citta arises and after
that the other factors also start to produce rūpas. Temperature produces
rūpa; if there were not the right temperature the new life could not develop.
Temperature produces rūpa throughout our life. As soon as the patisandhi-
citta has fallen away, at the moment the next citta arises, citta too starts to
produce rūpa, and it produces rūpa throughout our life. Furthermore, nutrition
produces rūpa so that the body can grow. It produces rūpa throughout our
life. Thus we see that there are four factors which produce rūpas of the body.
As regards rūpas which are not of the body but rūpas outside, such as rūpas
in dead matter or in plants, these are produced solely by temperature.
Kamma produces rūpa not only at the first moment of life but throughout our life. Kamma does not only produce the vipākacittas which experience pleasant and unpleasant objects through the sense-doors, it also produces throughout our life the rūpas which can function as the sense-doors through which these objects are received. Could we for instance create our own eyesense? It could not be produced by temperature, only by kamma. Transplantation of the eye cannot be successful unless kamma produces eyesense in the body of the receiver.