Biological Classification And System Of Classification Question 379
Question: Marine protozoans lack contractile vacuole because
[DPMT 2001]
Options:
A) Their body cannot accommodate it
B) They are hypo osmotic to their environment
C) They are isotonic with their environment
D) Osmoregulation is done by cell membrane
Show Answer
Answer:
Correct Answer: B
Solution:
Marine protozoa live in a hypertonic environment, unlike freshwater protozoa.
The contractile vacuole is used to store and remove excess water which is due to endosmosis.
Marine protozoa do not have contractile vacuole because they need to conserve water content from getting lost in the hyperosmotic environment.
BETA
