Final answer:
POIS typically has no standard definition in biology, but the context implies a discussion on poisons, such as herbicides and types of food poisoning. Different kinds of herbicides include contact, systemic, selective, and non-selective and pesticide poisoning may be acute or chronic. Common poisons can come from plants, animals and contaminated food.
Step-by-step explanation:
The term POIS does not have a common definition in the context of this question which appears to be asking about poison, specifically herbicides and causes of food poisoning. However discussing the differing types of herbicides and the types of pesticide poisoning alongside plant, animal and food poisons is relevant here.
Types of Herbicides:
- Contact herbicides - These kill only the plant tissue that they come in contact with.
- Systemic herbicides - These are absorbed and move within the plant to reach the areas that are not directly sprayed.
- Selective herbicides - These are designed to kill certain types of plants, while leaving the desired crop relatively unharmed.
- Non-selective herbicides - These kill all plants that they come into contact with.
Types of Pesticide Poisoning:
- Acute poisoning - Results from a single exposure and causes immediate health effects.
- Chronic poisoning - Results from repeated or continuous exposure over a long period and may lead to long-term health effects.
Common Poisons:
- Plant poisons - Naturally occurring toxins found in certain plants.
- Animal poisons - Toxins produced by animals, such as venom from snakes or spiders.
- Food poisoning - Illness caused by eating contaminated or toxic food.