In frogs, body proportions do not change with their growth. A frog that is twice as long as another will be heavier by approximately
1.
Two-fold
2.
Six-fold
3.
Four-fold
4.
Eight-fold
In a frog leaping frantically to escape a predator, which of the following modes of respiration is likely to occur?
| i. | Cutaneous |
| ii | Buccal |
| iii. | Pulmonary |
| 1. | i, ii, and iii |
| 2. | Only ii and iii |
| 3. | Only i and ii |
| 4. | Only i and iii |
After the rain, tadpoles were found swimming in a pond but not the frogs. This is due to-
| A. | lack of pituitary hormones. |
| B. | lack of sex hormones. |
| C. | lack of thyroxine |
| D. | lack of iodine in water |
Select the correct alternative.
| 1. | A and B | 2. | A and C |
| 3. | C and D | 4. | A, B, C and D |
Which of the following statements is INCORRECT?
| 1. | Cockroaches exhibit mosaic vision with less sensitivity and more resolution |
| 2. | A mushroom-shaped gland is present in the 6th-7th abdominal segments of male |
| 3. | A pair of spermatheca is present in the 6th segment of female cockroach |
| 4. | Female cockroach possesses sixteen ovarioles in the ovaries |
Match the following cell structure with its characteristic feature:
| Column-I | Column-II | ||
| (a) | Tight junctions | (i) | Cement neighboring cells together to form a sheet |
| (b) | Adhering junctions | (ii) | Transmit information through chemicals to another cell |
| (c) | Gap junctions | (iii) | Establish a barrier to prevent leakage of fluid across epithelial cells |
| (d) | Synaptic junctions | (iv) | Cytoplasmic channels to facilitate communication between adjacent cells |
Select the correct option from the following:
| Options: | (a) | (b) | (c) | (d) |
| 1. | (ii) | (iv) | (i) | (iii) |
| 2. | (iv) | (ii) | (i) | (iii) |
| 3. | (iii) | (i) | (iv) | (ii) |
| 4. | (iv) | (iii) | (i) | (ii) |
Which of the following statement is incorrect with respect to Rana tigrina?
| 1. | Muscular tongue is bilobed at tip and free from behind |
| 2. | Maxillary teeth are arranged along the margin of upper jaw and lower jaw is toothless |
| 3. | Tadpole larva of frog is with comparatively short alimentary canal than adult |
| 4. | Tail is present in the life cycle of frog |
Contraction of sternohyal muscles during breathing in frog
| 1. | Opens glottis |
| 2. | Closes glottis |
| 3. | Lowers floor of oral cavity |
| 4. | Raises floor of oral cavity |
If we cut the vagus nerve supplying the heart of frog.
the heart rate will
| 1. | Increase. | 2. | Decrease. |
| 3. | No effect on heart rate. | 4. | First decrease then normalised. |
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