Match List I with List II related to digestive system of cockroach.

List I		List II
A	The structures used for storing of food.	I	Gizzard
B	Ring of 6-8 blind tubules at junction of foregut and midgut.	II	Gastric Cacca
C	Ring of 100-150 yellow coloured thin filaments at junction of midgut and hindgut.	III	Malpighian tubules
D	The structures used For grinding the food.	IV	Crop

Choose the correct answer from the options given below:

The correct option is A-IV, B-II, C-III, D-I.

Let us analyze and match the structures of the cockroach's digestive system listed in List I with their correct names in List II step-by-step:

1. A: The structures used for storing of food.
In cockroaches, the esophagus dilates into a large sac-like structure called the crop, which is primarily used for storing food. Therefore, A matches with IV (Crop).

2. B: Ring of 6-8 blind tubules at junction of foregut and midgut.
A ring of 6 to 8 blind tubules called hepatic caeca or gastric caeca is present at the junction of the foregut and midgut. These secrete digestive juice. Therefore, B matches with II (Gastric Caeca).

3. C: Ring of 100-150 yellow coloured thin filaments at junction of midgut and hindgut.
At the junction of the midgut and hindgut, there is a ring of about 100 to 150 yellow-colored, thin, filamentous structures called Malpighian tubules. They serve an excretory function by helping in the removal of nitrogenous waste products from the hemolymph. Therefore, C matches with III (Malpighian tubules).

4. D: The structures used for grinding the food.
The gizzard (also known as the proventriculus) has an outer layer of thick circular muscles and an inner cuticle forming six highly chitinous plates called teeth. These teeth are used for grinding food particles. Therefore, D matches with I (Gizzard).

Combining all the individual matches, we get:
A - IV, B - II, C - III, D - I