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
List I | List II |
A. Blood | I. Adipose tissue |
B. Glial cells | II. Connective tissue |
C. Air sacs and lungs | III. Nervous tissue |
D. Skin | IV. Squamous epithelium |
Column I | Column II | ||
a. | Striated muscles | (i) | Assist in the transportation of food through the digestive tract |
b. | Visceral muscles | (ii) | Primarily involved in changes in the body postures |
c. | Cardiac muscles |
(iii) | Fibers are branched and involuntary |
Column-I | Column-II | ||
a. | Adhering junctions | (i) | Prevent the leaking of substances across the tissue |
b. | Gap junctions | (ii) | Rapid transfer of ions, small molecules between adjoining cells |
c. | Synapse | (iii) | Perform cementing to keep neighboring cells together |
d. | Tight junctions | (iv) | Transmit information through chemicals to other cells |
Column I | Column II | ||
a. | Gap junctions | (i) | Help in stopping substances from leaking across a tissue |
b. | Adhering junctions | (ii) | Keep neighbouring cells attached to each other |
c. | Tight junctions | (iii) | Connect the cytoplasm of adjoining cells |
(iv) | Facilitate communication between cells |