LIFESCI 1 Lecture Notes - Lecture 8: Bristlecone Pine, Lycopodiophyta, Only Time
Document Summary
Mosses (nonvascular), ferns (seedless vascular), gymosperms/angiosperms (seeded) Have mitochondria, chloroplasts, large vacuole (important in maintaining overall structure of plant) Waxy cuticle: important adaptation for preventing water loss. Openings called stomata allows co2 to enter inside leaf surface. Co2 enters through concentration gradient, equilibrates with outside concentration. Light stimulates stomata to open and allow co2 to enter. Risk involved: water will leave when stomata opens and co2 comes in. Two guard cells on either side of the stomata opening and the guard cells when full of water opens. As the stomata loses water, they shrink and stomata closes. With low water supply, stomata is not able to open so cell needs water for photosynthesis. As plants start to dehydrate, not enough water to keep stomata open. Cam photosynthesis: just know level of lecture not the book details: instead of opening stomata during day when there is sunlight. Open stomata at night and bring in co2 when it is cooler.