Q. No.Identify the types of cell junctions that help to stop the leakage of the substances across a tissue and facilitation of communication with neighbouring cells via rapid transfer of ions and molecules.
1. Adhering junctions and Tight junctions, respectively.
2. Adhering junctions and Gap junctions, respectively.
3. Gap junctions and Adhering junctions, respectively.
4. Tight junctions and Gap junctions, respectively.
Following are the statements about prostomium of earthworm.
| (a) | It serves as a covering for mouth. |
| (b) | It helps to open cracks in the soil into which it can crawl. |
| (c) | It is one of the sensory structures. |
| (d) | It is the first body segment. |
Choose the correct answer from the options given below:
1. (a), (b), (c) and (d) are correct
2. (b) and (c) are correct
3. (a), (b) and (c) are correct
4. (a), (b) and (d) are correct
Which of the following statements wrongly represents the nature of smooth muscle?
| 1. | Communication among the cells is performed by intercalated discs. |
| 2. | These muscles are present in the wall of blood vessels. |
| 3. | These muscles have no striations. |
| 4. | They are involuntary muscles. |
Consider the following four statements (A-D) related to the common frog Rana tigrina, and select the correct option stating which ones are true (T) and which ones are false (F).
Statements:
| (A) | On dry land, it would die due to lack of O2 if its mouth is forcibly kept closed for a few days |
| (B) | It has a four-chambered heart |
| (C) | On dry land, it turns uricotelic from ureotelic |
| (D) | Its life history is carried out in pond water |
| (A) | (B) | (C) | (D) | |
| 1. | F | T | T | F |
| 2. | T | F | F | T |
| 3. | T | T | F | F |
| 4. | F | F | T | T |
Ureters act as urinogenital ducts in:
| 1. | frog's males |
| 2. | human males |
| 3. | human females |
| 4. | frogs, both males and females |
The cells lining the blood vessels belong to the category of:
1. Connective tissue
2. Smooth muscle tissue
3. Squamous epithelium
4. Columnar epithelium
Frogs differ from humans in possessing:
| 1. | thyroid as well as parathyroid |
| 2. | paired cerebral hemispheres |
| 3. | hepatic portal system |
| 4. | nucleated red blood cells |
Select the incorrectly matched pair from the following:
1. Chondrocytes - Smooth muscle cells
2. Neurons - Nerve cells
3. Fibroblast - Areolar tissue
4. Osteocytes - Bone cells
Which of the following is not a connective tissue?
| 1. | Neuroglia | 2. | Blood |
| 3. | Adipose tissue | 4. | Cartilage |
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