Frogs are amphibians in the order

1. Apoda

2. Urodela

3. Anura

4. None of the above

Regarding frog:

I. They undergo aestivation and hibernation

II. They are carnivorous

III. They are poikilotherms

1. I, II, III are correct

2. I and II are correct

3. I and III are correct

4. II and III are correct

Gas exchange between the air and blood stream occurs in three locations in the frog:

1. (1) and (2)
2. (1) and (3)
3. (2) and (3)
4. (1), (2) and (3)

Regarding respiration in frogs:

I. The skin of a frog is permeable to oxygen and carbon dioxide, as well as to water.
II. When a frog is underwater, oxygen is transmitted through the skin directly into the bloodstream.
III. On land, adult frogs use their lungs to breathe

The correct statements are:

1. I, II, III
2. I and II
3. I and III
4. II and III

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

1. Conus arteriosus

2. Left atrium

3. Sinus venosus

4. Left ventricle

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.

Male and female frogs are distinguishable externally only during breeding season when:

1. the female develops nuptial pad in the thumb

2. the male develops nuptial pad in the thumb

3. the male develops nuptial pad in the thumb and the female develops a nuptial pad on other digits

4. the male develops large nuptial pad in the thumb while the female develops small nuptial pad in the thumb

Regarding skin of the frog, incorrect statement is:

1. It is made of the epidermis and the dermis

2. Mucous glands are present in the dermis and open at the surface

3. It is soft, moist and slimy

4. It is covered by scales

In frogs:

1. The dentition is homodont and the upper jaw is toothless.

2. The dentition is heterodont and the upper jaw is toothless.

3. The dentition is homodont and the lower jaw is toothless.

4. The dentition is heterodont and the lower jaw is toothless.

During aestivation and hibernation, frog respires by:

1. Lungs

2. Skin

3. Buccal mucosa

4. All of these