Does the middle east produce less than half the food and agro industry products it consumes

Yes, the Middle East produces less than half of the food and agro industry products it consumes. The Middle East a region heavily dependent on importing food and agro industry products. This is mainly due to the fact that most of the Middle East is not suitable for food production or farming of plants, even of animals. Big portion of it is a desert, and there's lack of water, so this is the biggest problem that contributes to this. Some parts produce solid amounts of food and agro industry products, but it is shaded by the general situation.

Well, a and b together would be negative. b alone would also be negative.

Most of the land is used for housing/commercial uses