Energy and Ecosystems SJCHS

Photosynthesis Photosynthesis: Carbon (C) in CO 2 made into glucose Occurs in plants

Why are plants green? Light can be transmitted, absorbed, reflected

Why are plants green? Light that is reflected is what we see (other colors absorbed)

Why are plants green? Pigment: Chemical that can absorb light or emit light Chlorophyll: pigment in plants Chlorophyll only reflects green light (absorbs other colors)

Chloroplasts Chloroplast: Where photosynthesis occurs in plant cells

Stomata Stomata: Pores in leaf; allow carbon dioxide, oxygen, and water in/out Can open/close

Photosynthesis Inputs Water: absorbed through the roots of a plant Carbon Dioxide: Comes in stomata Sunlight Outputs Oxygen: From breakdown of Water; Leaves via stomata Glucose: Stored or used by plant

Primary Productivity Production: Total biomass of light fixed by a plant (made into sugar) Depends on temperature, light, water, nutrients Primary Productivity: How much biomass is produced in a given area over a period of time Depends on leaf/plant area, growth rate, production Some ecosystems are more productive than others

Video

Photosynthesis Radish experiment: Dish 1 contained seedlings that germinated and grew with light and water (+light, +water). Dish 2 contained seedlings that germinated and grew in the dark with water available (-light, +water). Dish 3 contained seeds that had light but no water (+light, -water). The seeds were allowed to grow and then were dried

None of the seedlings in the different experimental conditions would increase in mass because there is no soil. a.Reasonable b.Not Reasonable c.Not Sure

If any of the seedlings increased in mass at the end of the experiment (compared with the initial mass of the seeds), it was mostly due to the water the plant was given. a.Reasonable b. Not Reasonable c. Not Sure

If any of the seedlings increased in mass at the end of the experiment (compared with the initial mass of the seeds), it was mostly due to molecules in the air that the plant took in. a.Reasonable b.Not Reasonable c.Not Sure

If any of the seedlings increased in mass at the end of the experiment (compared with the initial mass of the seeds), it was because light itself has mass. Plants use the mass in light to become heavier. a.Reasonable b. Not Reasonable c. Not Sure

If the seedlings are continually supplied with water and light, they will always continue to grow. a.Reasonable b. Not Reasonable c. Not Sure

None of the seedlings in the different experimental conditions would increase in mass because there is no soil. a.Reasonable b.Not Reasonable c.Not Sure

If any of the seedlings increased in mass at the end of the experiment (compared with the initial mass of the seeds), it was mostly due to the water the plant was given. a.Reasonable b. Not Reasonable c. Not Sure

If any of the seedlings increased in mass at the end of the experiment (compared with the initial mass of the seeds), it was mostly due to molecules in the air that the plant took in. a.Reasonable b.Not Reasonable c.Not Sure

If any of the seedlings increased in mass at the end of the experiment (compared with the initial mass of the seeds), it was because light itself has mass. Plants use the mass in light to become heavier. a.Reasonable b. Not Reasonable c. Not Sure

If the seedlings are continually supplied with water and light, they will always continue to grow. a.Reasonable b. Not Reasonable c. Not Sure

Cellular Respiration Cellular Respiration: Glucose broken down to make ATP Occurs in all organisms

Cellular Respiration Mitochondria: Where cellular respiration takes place in a cell

Cellular Respiration Inputs Glucose: Comes from food Oxygen: Inhaling Outputs Water: Used in organism ATP: Used for cellular work Carbon Dioxide: Exhaling

Ecosystem Products from cellular respiration help to power photosynthesis and vise versa