The number of producers is more than consumers and top carnivores in ecosystem. for example:- in the food chain of grass--goat--man,atleast 90% of energy is pasted to other level and 10% will be stored at that level it self. 
        grass                 goat                   man
       50/100               40/80                30/60.
as we human beings depend on plants and animals for our food for our whole life we need atleast 100 numbers of small plants for one week.
        
             
        
        
        
Answer:
organelles are very similar to present-day bacteria, suggesting a common ancestor.
Explanation:
Some evidence suggests that some organelles like mitochondria and chloroplasts within eukaryotes were once used to be independent eukaryotes.
Endosymbiosis theory says that ancestral prokaryotic cells engulfed bacteria like cyanobacteria which with time evolved into mitochondria and chloroplast. Molecular evidence also proves that these organelles were once prokaryotic organisms because they show similar genetic makeup and ribosome type.
So these organelles are similar to present-day bacteria showing that they have a common ancestor. 
 
        
             
        
        
        
The answer to this question would be: False
The symbiotic between plant and fungus is called lichen. In this case, the Mycorrhizae having a mutualism symbiotic with algae as they are giving benefit to each other. The Mycorrhizae will give water and inorganic compound and the algae will give food. The answer is false because the algae are not parasitic to the fungi.