1. | Olfactory lobe | 2. | Optic lobe |
3. | Pons | 4. | Cerebellum |
I: | The hind limbs are heavily muscled and strong. |
II: | The webbing between the toes of the hind feet increases the area of the foot and helps propel the frog powerfully through the water. |
1. | Only I | 2. | Only II |
3. | Both I and II | 4. | Neither I nor II |
1. | Oesophagus | 2. | Stomach |
3. | Small intestine | 4. | Rectum |
I: | lack eyelids and limbs |
II: | have cartilaginous skeletons |
III: | use gills for respiration |
IV: | have tails |
Statement I: | Frog eye does not have closable eye lids. |
Statement II: | A nictitating membrane provides protection to the eye, especially when the frog is swimming. |
I: | Oxygenated blood from the lungs and de-oxygenated blood from the respiring tissues enter the heart through separate atria. |
II: | When atria contract, the two blood streams pass into a common ventricle. |
III: | From the ventricle the blood is pumped via a spiral valve to the appropriate vessel, the aorta for oxygenated blood and pulmonary artery for deoxygenated blood. |
1. | Mammals | 2. | Birds |
3. | Reptiles | 4. | Amphibians |
I: | To warm up, they can move into the sun or onto a warm surface; if they overheat, they can move into the shade. |
II: | In cool damp conditions, the colour of the skin will be lighter than on a hot dry day. |
1. | carnivorous | 2. | filter feeders |
3. | sanguinivorous | 4. | herbivorous |
Assertion (A): | Frogs are at their most vulnerable to predators when they are undergoing metamorphosis. |
Reason (R): | At this time, the tail is being lost and locomotion by means of limbs is only just becoming established. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is True. |