Animal Kingdom Question 431
Question: In Pheretima nepheridia occur in [APMEE 1996]
Options:
A) All segments except 1 - 4 and 10 - 14
B) 1–2, 4–6, 15 to last segments
C) Meganephridia in pre-clitellar and micronephridia in post-clitellar segments
D) Micronephridia in all segments; meganephridia from clitellar region to end
Show Answer
Answer:
Correct Answer: D
Solution:
Nephridia are absent in the first three segments and the last segment of the digestive tract.
Some workers believe that all the nephridia are of the micronephridia type.
Other consider septal nephridia to be metanephridia.
BETA
