P6 Science Concept Consolidation
Definition a characteristic of a living organism that increases its chances of survival in the environment of its habitat.
An organism that is adapted to its environment is able to:
Obtain sufficient air, food and water
Defend itself from natural predators
Reproduce
cope with physical conditions
temperature
amount of water
amount of light
Respond to changes around it
Structural Adaptations
Distinct physical characteristics to help an organism to increase its chances of survival in its natural habitat
Behavioral Adaptations
Special ways in which an organism behaves to increase its chances of survival in its natural habitat
Not suitably adapted to its environment
Move out
Die out
Energy and the sun
Photosynthesis
the process by which photosynthetic organisms, such as green plants, make food in the presence of light, water and carbon dioxide
Makes food--> sugar, glucose
Excess food is stored as starch in plant parts
Seeds
Roots
Stem
Leaves
By product-->Oxygen
Excess water escapes through the stomata as water vapour
Food made by the leaves are transported to other parts of the plant through the food-carrying tubes
Water and mineral salts move to other parts of the plant through the water-carrying tubes
Water and Mineral salts are absorbed by the roots
The sun is our primary source of energy
Testing for the occurrence of photosynthesis
Indicator solution
Data logger
Limewater
Detects the presence of Carbon Dioxide when the gas dissolves in it
Iodine
Detects the presence of starch in a leaf
If carbon dioxide in present--> turns cloudy/chalky
If starch is present--> turns dark blue
If starch is absent--> remains yellowish brown
Factors affecting photosynthesis
Temperature
Presence of chlorophyll
Colour of light
Amount of light
Green light is the least suitable
Red and blue light are most suitable
30 degrees celcius is most suitable
variegated leaves
Some parts of the leaf do not contain chlorophyll 