Biol 201 3-18-2011

Biol 201 3-18-2011 - eat these plants • Herbivores...

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Herbivores: Plants grow adaptations to protect themselves from herbivores Physical defenses: o Cilia (common in grass) o Hairs o Waxy cuticles (defense against fungi) o Nettles o Thorns Plants have very high C:N ration show that plats are rich in C and poor in N. Dosent match that in mammal, fungi and bacterica Plants are not just good for eating, because they are really just rich in sugar and it is not good for digestability (cellulose, tannin, and lignin) Most animals require a symbiotic relationship with other organism to cope with plant digestion. Plants also have poisons such as alkaloids, which are very rich in Nitrogen. Nitrogen helps plants in their daily functions, but it doesn’t in animals. Poison in plants helps specialize herbivores, because only some organisms are made to
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Unformatted text preview: eat these plants. • Herbivores specialize by concentration on parts of the plant where they could get the most nutrients. For example, we eat leaves which have the most amount of N and some insects eat leaves between leaf veins to get what they need. • Humans have grown immune to some of the plants and their poisons. Examples: spices, recreational drugs and medicinal drugs. • Some herbivores had evolved to use these secondary for their own self defense. Example: Monarch butterfly caterpillar. Predators: • Carnivores have to evolve to find pray • Crypsis: hard to find prey • Active defense in the prey • Size plays role in ability of predator in consume prey. Fish sometimes swallow whole. •...
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