Visual units that compose the compound eyes of 

insects are called

Sense organs of cockroach include

1. Compound eyes

2. Johnston's organ

3. Osphradium

4. Spiracles

The night vision of cockroach is

Which of the following statement is correct with reference to the cockroach eye?

1. Both eyes together consist of about 2000 hexagonal ommatidia

2. Its vision has more sensitivity but less resolution

3. Mosaic vision is not found due to diurnal habit

4. Compound eyes are situated at the vertex region of the head

The central nervous system of cockroach includes

1. Brain and ganglionated dorsal nerve cord

2. Brain and ganglionated ventral nerve cord

3. Brain and hollow nerve cord

4. Dorsal solid nerve cord only

Choose the incorrect match with respect to total number of following structures in cockroach

1. Spiracles – 10 pairs

2. Gastric caeca – 6-8

3. Malpighian tubules – 100-150

4. Ommatidia – 2000