Frogs

Frog’s heart when taken out of the body continues to beat for some time.
Select the best option from the following statements.
(a) Frog is a poikilotherm.
(b) Frog does not have any coronary circulation.
(c) Heart is "myogenic" in nature
(d) Heart is autoexcitable

1. Only (d)

2. (a) and (b)

3. (c) and (d)

4. Only (c)

Frogs respire in water by skin and buccal cavity and on land by skin, buccal cavity and lungs.
Choose the correct answer from the following:

1.	The statement is false for water but true for land
2.	The statement is false for both the environments
3.	The statement is true for water but false for land
4.	The statement is true for both the environments