Module 2 Flashcards
Unicellular
Organisms composed of a single cell
Multicellular
A community of cells that work co-operatively to survive and reproduce
Colonial organism
An organism made up of two or more organisms living in close association
Colonial organism: Obligate
Survival depends on colony
Colonial organism: Facultative
Forms colonies when helpful
Example: Colonial organism
Blue bottle
Gas exchange in plants
Plants take in carbon dioxide. They don’t have lungs so the leaves are the primary site of gas exchange
Stomata
Small paws in plant tissue that allow gases in and out. Flanked by specialised cells known as guard cells
Gas exchange in animals
Unicellular organisms exchange via simple diffusion. Whereas multicellular require specialised organ systems
Efficient respiratory features
Thin moist surface, high Sa:V ratio, ventilation and a carrier fluid
Example: Carrier fluid
Blood
How plants acquire nutrients
Through their gas exchange and root system
Nutrients plants roots absorb
Water, nitrogen and vitamins
How plants absorb nutrients
Plants roots are lined with specialised cells which have a long folded membrane that absorbs nutrients efficiently
How animals acquire nutrients
Through digestion and alimentary canals
Nutrients
Any substance an organism needs to survive, grow and reproduce
Inorganic nutrients
Simple compounds
Example: Inorganic nutrients
water, carbon dioxide, oxygen, nitrogen
Organic nutrients
Complex compounds
Example: Organic nutrients
Carbohydrates, lipids, proteins, nucleic acids, vitamins
Photosynthesis
Sunlight converts into chemical energy involving the chloroplast
Photosynthesis equation
Carbon dioxide + Water (sunlight) = glucose + oxygen
Respiration
Converting glucose into ATP involving the mitochondria
Enzymes
Complex organic molecules that need to be broken into subunits to be absorbed by cells
