Ch 2 Plant Bio Cells & Elements

Chapter 2

Cells

structural units of organisms

Plant defining features

cell membrane, cytoplasm, nucleus, cell wall

Growth

increase in mas and volume

reproduction

production of offspring

response to stimuli

responding to injury, light, temperature, gravity

metabolism

collective product of all biochemical reactions in plants

Photosynthesis

converting sunlight, CO2, and H2O to produce sugar and oxygen

Respiration

converts chemical enegy from glucose and oxygen to ATP and CO2

Digestion

conversion of large insoluble food molecules to smaller souble molecules

assimilation

movement of absorbed nutrients to the cells where they are to be used

movement

slow and perceptible

6 common elements

carbon, hydrogen, oxygen, nitrogen, potassium, calcium

Macronutrients

carbon, hydrogen, oxygen, nitrogen, potassium, calcium, magnesium, phosphorous, sulfur

micronutrients

iron, chlorine, manganese, boron, zinc, copper, nickel, molybdenum

compound

two or more elments united in a definite ratio by chemical bonds

molecules

two or more atoms bound together

chemical reactions

random collisions between molecules capable of sharing electrons

Polar molecules

unequally share electrons

Cohesion

attraction of similar molecules

adhesion

attraction of dissimilar molecules