During the discussion in class, Rohan gives a statement that, 'A tissue is a group of similar cells performing similar functions'. But Rajiv counter argues that, 'this is true in case of simple tissues but little different in case of complex tissues'. Provide your explanation in view of the discussion in class.
Rohan's statement that a tissue is a group of similar cells performing similar functions is correct as a general definition. Cells of similar type performing similar functions group together to form a tissue, which leads to the division of labour.
However, Rajiv's counter-argument is also valid. This definition holds entirely true for simple permanent tissues, but it differs when we consider complex permanent tissues.
Simple permanent tissues are composed of only one type of cell. Examples include parenchyma, collenchyma, and sclerenchyma. In these tissues, a group of similar cells works together to perform a specific function, perfectly matching Rohan's statement.
On the other hand, complex permanent tissues are composed of more than one type of cell. For instance, xylem and phloem are complex tissues. They consist of different types of cells that coordinate to transport water and food respectively to all parts of the plant.
Thus, while Rohan states the fundamental definition, Rajiv accurately highlights that in complex tissues, different types of cells group together to perform a specific common function, making the definition slightly different.
Explanation
The textbook context establishes that a tissue is generally a group of cells similar in structure working together for a specific function, leading to division of labour. However, it explicitly differentiates between simple and complex permanent tissues. Simple tissues are composed of only one type of cell (like parenchyma, collenchyma, sclerenchyma), validating Rohan's statement. Complex tissues (like xylem and phloem) are composed of more than one type of cell working together for a common function (conduction), which validates Rajiv's counter-argument.
Solution Steps
Step 1: Validate Rohan's statement as the general definition of a tissue (similar cells, similar function).
Step 2: Validate Rajiv's counter-argument by distinguishing between simple and complex permanent tissues.
Step 3: Explain simple permanent tissues as being composed of only one type of cell, fitting Rohan's definition.
Step 4: Explain complex permanent tissues as being composed of more than one type of cell working together, fitting Rajiv's argument.
Step 5: Conclude that both students are correct from their respective perspectives of simple and complex tissues.