Question

NTSE Exam Question Biology Water balance in fresh water protozoans is maintained by (a) Food vacuoles (b) Diffusion (c) Nucleus (d) Contractile Vacuoles

Answer 1

(D) contractile vacuoles is the correct answer

Answer 2

Water balance in freshwater protozoans is maintained by contractile vacuoles

Explanation:  

The vacuoles are specific organelles of the plant cell. They help in maintaining the shape of the cell. These vacuoles also are majorly seen in protozoans and assist them for several functions such as to feed, to excrete etc. The organism in freshwater tend to burst due to the osmolarity difference inside the organism to the outside environment. This situation is controlled with the help of vacuoles.