Question

Why are cells of meristematic tissues undifferentiated and have thin cell wall? 2. Why do we find a large number of dead, supportive tissue in plants? 3. What is the utility of tissues in multi-cellular organisms?

Answer 1

Answer:

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Explanation:

In unicellular organisms, a single cell performs all basic functions. For example, in Amoeba, a single cell carries out movement, intake of food and respiratory gases, respiration and excretion. But in multi-cellular organisms there are millions of cells. Most of these cells are specialised to carry out a few functions. Each specialised function is taken up by a different group of cells. Since these cells carry out only a particular function, they do it very efficiently. In human beings, muscle cells contract and relax to cause movement, nerve cells carry messages, blood flows to transport oxygen, food, hormones and waste material and so on. In plants, vascular tissues conduct food and water from one part of the plant to other parts. So, multi-cellular organisms show division of labour. Cells specialising in one function are often grouped together in the body. This means that a particular function is carried out by a cluster of cells at a definite place in the body. This cluster of cells, called a tissue, is arranged and designed so as to give the highest possible efficiency of function. Blood, phloem and muscle are all examples of tissues.

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Answer 2

Explanation:

Q1 Answer;

The cells of meristematic tissues have thin cell wall as their main function is to divide and thicker wall would make this division difficult

Q2 Answer;

There are large number of dead and supportive tissues in plants as their main function is the transmission of water, nutriments and assimilates

Q3 Answer

In multicellular organisms, cell bind together to form tissues. These tissues are performing a specific function in the body