Poisons and allergens of plants and animal origin.their effect on the human body

Poisonous plants are plants that produce toxins that deter herbivores from consuming them. Plants cannot move to escape their predators, so they must have other means of protecting themselves from herbivorous animals. Some plants have physical defenses such as thorns, spines and prickles, but by far the most common type of protection is chemical.
Over millennia, through the process of natural selection, plants have evolved the means to produce a vast and complicated array of chemical compounds in order to deter herbivores. Tannin, for example, is a defensive compound that emerged relatively early in the evolutionary history of plants, while more complex molecules such as polyacetylenes are found in younger groups of plants such as the Asterales. Many of the known plant defense compounds primarily defend against consumption by insects, though other animals, including humans, that consume such plants may also experience negative effects, ranging from mild discomfort to death.

Hundreds of species of plants release their pollen into the air every year, causing allergic reactions in many people.
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Weed Pollen Allergies
English plantain.
lamb's quarters.
ragweed (which affects nearly one in five Americans)
redroot pigweed.
sagebrush.
tumbleweed (Russian thistle

Poisonous animals[edit]. This list is a partial list of animals that are poisonous to humans (and other animals), or put another way, their flesh is toxic if consumed, ..
.‎List of venomous animals · ‎
Blue-capped ifrit
· ‎Common quail
· ‎Spur-winged goose

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