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

There are ___________ pairs of cranial nerves in frog.

1. 8

2. 10

3. 11

4. 12

Consider the following parts of the brain of frog:

I. Olfactory lobes
II. Optic lobes
III. Cerebral hemispheres
IV. Diencephalon

Forebrain includes:
1. I, II, III, IV
2. I, II, III
3. I, III, IV
4. II, III, IV

The hind brain of frog consists of:

1. Pons and Medulla

2. Cerebellum and Pons

3. Hypothalamus and Thalamus

4. Cerebellum and Medulla

The skull of frog is:

1. Acondylic

2. Monocondylic

3. Dicondylic

4. Polycondylic