The outermost layer of the skin of the frog is made of:
| 1. | Stratified squamous keratinized epithelium |
| 2. | Stratified squamous non keratinized epithelium |
| 3. | Simple squamous cpithelium |
| 4. | Simple columnar epithelium |
Regarding feeding habits:
| 1. | Tadpole is herbivorous and frog is carnivorous |
| 2. | Tadpole is carnivorous and frog is herbivorous |
| 3. | Both tadpole and frog are carnivorous |
| 4. | Both tadpole and frog are herbivorous |
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 | the skin |
| 2 | the lining of the mouth |
| 3 | the lungs |
| 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. | Haemoglobin is present in red blood corpuscles which are biconvex and nucleated. |
| 2. | Haemoglobin is present in red blood corpuscles which are biconcave and nucleated. |
| 3. | Haemoglobin is present in red blood corpuscles which are biconvex and enucleated. |
| 4. | Haemoglobin 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 |