Question Video: Recalling Features of Plant Tissues | Nagwa Question Video: Recalling Features of Plant Tissues | Nagwa

Question Video: Recalling Features of Plant Tissues Biology • First Year of Secondary School

Which of the following is true about plant tissues? [A] Plant tissues have no specialized functions, unlike animal tissues. [B] Due to their compacted condition, plant tissues can only be examined by an electron microscope. [C] Some plant tissues are complex in structure and consist of different types of cells. [D] Chlorophyll is an essential component in all types of plant tissues.

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Video Transcript

Which of the following is true about plant tissues? (A) Plant tissues have no specialized functions, unlike animal tissues. (B) Due to their compacted condition, plant tissues can only be examined by an electron microscope. (C) Some plant tissues are complex in structure and consist of different types of cells. Or (D) chlorophyll is an essential component in all types of plant tissues.

As the question asks us to find the true statement, let’s discuss the different statements in detail.

The statement given by answer option (A) is not true. The definition of a tissue is that it is a group of specialized cells that work together to carry out specific functions. And this is true no matter the source of the tissue, plants or animals. Different plant tissues therefore do indeed have different specialized functions.

To make this clearer, let’s look at three common simple tissues of a plant. Parenchyma tissue is often found in leaves and stems, and its cells perform photosynthesis and store water and nutrients. Collenchyma tissue is made up of cells with a thick cell wall and functions in giving a plant support and flexibility. Sclerenchyma tissue consists of cells with an even thicker, stronger cell wall and functions in giving a plant mechanical strength and structural support.

To understand if answer option (B) is correct, we need a little bit of knowledge of the sizes of different objects and microscopes used to see these objects. An electron microscope is used to see very small structures, such as cell organelles, bacteria, and viruses. To observe cells, a common light microscope is sufficient. As tissues are made up of cells, a light microscope can be used to observe plant tissues. An electron microscope would actually not be helpful as it would zoom in too much and we could not observe the plant tissue as a whole anymore.

Some plant tissues are indeed complex in structure and consist of different types of cells. These tissues are called compound tissues and differ from the previously discussed simple tissues, as simple tissues are composed of cells that are both functionally and structurally similar. An example of such complex tissues can be found in the xylem and phloem, which are the vascular bundles or transport tissues of a plant, responsible for transporting water, sugars, and other molecules through the plant. This seems to be our correct answer. But let’s discuss the last answer option, just to be sure.

Answer option (D) claims that chlorophyll is an essential component in all types of plant tissues. This is not true. Chlorophyll is a pigment found in chloroplasts. It absorbs sunlight energy so that the plant can convert water and carbon dioxide into sugars and oxygen during the process of photosynthesis. It is only found in plant tissues which photosynthesize, like leaves and some stems. However, there are tissues that contain cells which have no chloroplasts and hence no chlorophyll, such as root hair cells. There is no point of these cells having chloroplasts as they are underground so do not receive sunlight.

Now we know for sure that the correct statement about plant tissues is answer choice (C). Some plant tissues are complex in structure and consist of different types of cells.

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