“For Adam was first formed, then Eve. And Adam was not deceived, but the woman being deceived was in the transgression.”
It would appear that Eve’s reasoning for taking the fruit was as follows:
The tree was good for food. Her intelligent eyes were able to discern that this food was good. By good, we must presume it meant that she could somehow estimate the fruit’s food value. She saw it was a delight to the eyes. This reminds us that fruit is often very attractive, whether it is fruit that we eat or fruit that we don’t. And in a perfect creation, we can certainly assume that this fruit was very beautiful to look at, and possibly looked delicious. She also saw that the tree was "to be desired to make one wise”. The function of the tree must have been apparent to her. After all, contrary to what the serpent alleged, the function of the tree was not a secret. She knew what it was for, and she knew what the penalty would be for breaking the commandment. And the fruit was not poisonous. It was not the fruit that caused Adam and Eve’s death; it was their disobedience.
Which brings us to the big question: Where was Adam when all this was happening? Why did he not step in? Verse six tells us that he was right there with his wife. He heard everything. And he was not deceived. So that is why his disobedience was more serious than that of Eve, who sinned after being deceived. Adam sinned with his eyes open, and that sin has been imputed to us all.