Bacteriophages, Adenoviruses, or parvoviruses
A metallurgical microscope
In a hypotonic solution
Explanation:
Contractile vacuoles are used mainly by protozoans like an amoeba in osmoregulation. When the organism environment becomes hypotonic to the cell's cytoplasm, the contractile vacuole pumps more rapidly. This is because, in the hypotonic environment, more water is getting into the cell by osmosis. To maintain the right osmotic pressure in the cell more water is needed to be pumped out – this is a function of the organelle.
The correct option is B.
Carrot can be described as a ground tissues because it is formed inside the ground in form of tap root. The remaining options are incorrect for the following reasons:
1. Animals can not make their own food because they do not have chloroplast not because they do not have vacuoles.
2. The main function of dermal tissue is protection from water loss not photosynthesis.
3. The cerebellum controls balance and coordination not cerebrum.
