Chlorosis and animal body mass Flashcards
What is chlorosis?
Leaves look pale or yellow because cells are not producing enough chlorophyll
What is the effect of chlorosis?
It reduces the plants ability to make food by photosynthesis
What are environmental factors that affect chlorosis?
Lack of light, mineral deficiencies and virus infections
What happens as a result of lack of light?
In the absence of light, plants turn off chlorophyll production to conserve resources and chlorosis only occur when plant gets no light
What is the effect of mineral deficiencies?
A lack of iron which is needed as a cofactor for enzymes that make chlorophyll or magnesium which is found inside chlorophyll
What is the effect of viruses?
The interfere with the metabolism of cells and infected tissue can yellow and not support chlorophyll synthesis
How is body mass a result of environmental factors?
Dramatic size variation
What is the main cause of body mass within animals?
Lifestyle
How is lifestyle the main cause of body mass in animal?
Food consumed - both quality and quantity and excercise undertaken
What is the genetic link to body mass in animals?
Some obesity is due to genes
What is etiolation?
Plants growing in the absence of light
What is etoilation?
An environmental form of variation
What type of factors cause chlorosis?
Environmental
