AP BIOLOGY

Detailed explanation-1: -Xylem is made up of tracheids, tracheae, xylem parenchyma and xylem fibers. Phloem is composed of sieve elements, companion cells, phloem parenchyma and phloem fibers. Hence xylem and phloem are called complex tissues.

Detailed explanation-2: -Xylem and phloem are known as complex tissues as they are made up of more than one type of cells. These cells work in a coordinated manner, as a unit, to perform the various functions. Xylem helps in conducting water and minerals.

Detailed explanation-3: -Xylem and phloem are examples of complex tissues.

Detailed explanation-4: -Complete answer: Xylem and phloem are an example of complex permanent tissues. These tissues are named so because they are made up of more than one type of cells and all these different types of cells coordinate to perform the same function.

Detailed explanation-5: -Answer: A complex tissue is the one which has more than one type of cells having a common origin which coordinates to perform a common function. Xylem and phloem are made of different types of cells hence they are called complex tissues.