Structural Orga...

Which of the following cells of cockroach secrete saliva?

Consider the following four statements (A-D) related to the common frog Rana tigrina and select the correct option stating which ones are true (T) and which ones are false (F)
Statements
(A) On dry land it would die due to lack of $${O}_{2}$$ if its mouth is focibly kept closed for a few days
(B) It has four-chambered heart
(C) On dry land it turns uricotelic from urcotelic
(D) Its life-history is carried out in pond water

In insects, muscle contraction, oviposition defecation and heartbeats are regulated by 

Which of the following are true regarding the common bull frog?
a) Poisonous
b) Croaking during peak winters
c) Mimicry
d) Hibernation
e) Carnivorous
f) Internal fertilization

Frog is _____________.

In earthworm skeleton like function is performed by _______________.

Which of the two parts in cockroach are fundamentally similar in structure?

Human heart contains $$4$$ chambers, whereas cockroach has a heart with.

In the system of cockroach, atrium is a part of 

How many nerve ganglia are present in cockroach?