It's not that we have receptors for plant chemicals, but that we have receptors for chemicals that are similar to ones found in certain plants. So when someone found the effects of smoking weed, it was a matter of time before genes that promote such behavior is favored among weed smokers. Richard Dawkins's The Extended Phenotype clearly applies in this case. I also recommend The Selfish Gene if you've any questions about evolution.
Gustatory receptors are also present in the mouths of animals. These are novel proteins which are able to recognize a variety of chemicals.
nuerotransmitter
Plant growth hormones e.g. IAA.
It can affect the nutrients the plant gets and the chemicals and liquids it contains
No. A plant also uses sunlight, an external source of energy.
sensoria
Taste and smell receptors are activated by chemicals.
No, plant life does not have brains.
taste buds and nose
taste buds and nose
Gustatory receptors are also present in the mouths of animals. These are novel proteins which are able to recognize a variety of chemicals.
guts mucus and brains
test tube, brains, beakers, chemicals
Chemoreceptors (chemical receptors) respond to chemicals in food and scents.
No ways for brains. Sorry. But for gold plant your crops and change the time.
nuerotransmitter
yes! fungi produce chemicals that digest plant remains.