| Read the passage given below and answer the questions from [21] to [25]. |
| In multicellular organisms, there are millions of cells. Most of these cells are specialised to perform a select few functions. Each specialised function is taken up by a different group of cells or tissues. Since, these cells of a tissue carry out only a particular function, they do it very efficiently. |
| For example, in human beings, muscle cells contract and relax to cause movement, nerve cells carry messages and blood Hows to transport oxygen, food, hormones and waste materials and so on. |
| Likewise, in plants, vascular tissues (xylem, phloem) conduct water and food from one part of the plant to other parts, meristematic tissues regulate normal growth and development, etc. |
| Thus, it can be said that multicellular organisms show division of labour. |
| Thus, cells are arranged and designed in a way so as to give the highest possible efficiency of the function they perform. |
| Which of the following will correctly define tissue? |
| I. Group of cells |
| II. Perform certain function |
A) Only I
B) Only II
C) Both I and II
D) None of the above
Correct Answer: C
Solution :
[c] A tissue is a cluster of cells which are similar in structure. They work together to perform a specific function.
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