In cockroach, male genital open into.....
Mid- ventral region of $8^{th}$ segment
Mid-ventral region of $9^{th} $ segment
Mid-ventral region of $10^{th}$ segment
Mid-ventral region of $7^{th}$ segment
The figure given below shows the alimentary canal of cockroach with few structures labelled as $1,2,3$ and $4 .$ Identify the correct identification of the structure which is also called proventriculus and helps in grinding the food particles.
Which of the following features is not present in Periplaneta americana?
Location and Function :
$(i)$ Malpighian Tubules
$(ii)$ Compound eyes
Position of testis in Periplaneta americana
Draw a neat and well labelled diagram of male reproductive system of a frog.