Identify the organism growing on the piece of bread.

The correct option is (B):

Explanation of the correct option:

1. ​The mold that grows on bread is caused due to the spread of a common fungus that grows on it.
2. The bread mold appears like a green or black color as visible on the loaf of bread and it reproduces further spreading throughout the bread forming spores.
   
3. Formation of bread mold occurs due to prolonged exposure of the bread to the moist air and fungus can thrive in the presence of moist air.
   
4. This leads to spoilage of bread.
   

Explanation of the incorrect options:

Option (A):

1. ​Bacteria does not easily grow on breads.
   

Option (C):

1. ​Plants do not lead to the spoilage of bread as given in the image.
   

Option (D):

1. Worms do not naturally form on bread loaves unless the bread is exposed to the worms. ​

Final Answer: Bread mold is growing on the piece of bread.