Which of the following statement is incorrect regarding a frog?
1. Digestive system without salivary gland
2. Respiratory system without intercostal muscles
3. Circulatory system without SA node.
4. Reproductive system without copulatory organs.

A thin-walled, triangular chamber attached dorsally to heart of a frog is known as

1. Truncus arteriosus

2. Sinus venosus

3. Atrium

4. Ventricle

In a frog, heart is enclosed within a two-layered sac called

1. Mesorchium

2. Pericardium

3. Pleura

4. Conus arteriosus

In frog:

1. Hemoglobin is present in red blood corpuscles which are biconvex and nucleated.

2. Hemoglobin is present in red blood corpuscles which are biconcave and nucleated.

3. Hemoglobin is present in red blood corpuscles which are biconvex and enucleated.

4. Hemoglobin is present in red blood corpuscles which are biconcave and enucleated.

In the given diagram of the heart of frog identify X :

1. Conus arteriosus

2. Left atrium

3. Sinus venosus

4. Left ventricle

Ventricle of frog contains:

(1) oxygenated blood

(2) deoxygenated blood

(3) no blood

(4) mixed blood

An animal which contains three-chambered heart is ______________.

1. man

2. rabbit

3. fish

4. frog

Compared to those of humans, the erythrocytes in frogs are:

1. Without nucleus but with haemoglobin

2. Nucleated and with haemoglobin

3. Very much smaller and fewer

4. Nucleated and without haemoglobin