Which plant that has no plant cell


The cross-section of the cell shows an image as it can be seen in a scanning electron microscope. The cell is a complicated system of components, cell organelles and chemical substances that was ingeniously devised by nature. The Cell wall with its inner part, the Plasma lemma, delimits that Cytoplasmcontaining mineral salts, sugar and coloring agents. The vacuoles develop from the plasmalemma. These enlarge as the cell grows and mainly contain water and nutrients.

The Cell nucleus is surrounded by a nuclear membrane and contains Nucleoli (Nuclear corpuscles). Inside the core there is a chromate structure that is already visible under the light microscope. It contains Chromosomes and DNA (deoxyribonucleic acid, English DNA) as hereditary material, as well as proteins. The core bodies contain RNS (ribonucleic acid, English RNA) and proteins. The RNA is required to copy the cell.

The cytoplasm (cell plasma) is traversed by channels that are called Endoplasmic reticulum (ER). The ER represents a transport system within the cell to the plasmalemma of the cell wall Ribosomes are responsible for building proteins and new cells. Also in the Dictyosomes of Golgi apparatus substances are mainly produced to build up the cell wall. The Mitochondria serve to generate energy and are also the control center for the breakdown of high-energy carbon compounds (dissimilation). During cell division through mitosis, a new cell wall is first formed, followed by the production of the other components of the new system.

The Plastids are cell organelles (small cell organs) that are enclosed by a double membrane. They belong to them Chloroplasts, the Chromoplasts and the Leukoplasts. The chloroplasts contain photoactive dyes such as chlorophyll or carotenoids. They enable photosynthesis and thus the creation of high-energy carbon compounds from carbon dioxide (assimilation). The chromoplasts are involved in the formation of pigments, the leucoplasts enable the storage of starch.


Task: Create a table in which the differences between an animal cell and a plant cell are worked out. Explain the respective functions of the cell components. What are the advantages of the cell wall for the plant? Why does the animal cell have no cell wall?




additional Information

Structure of an animal cell
Cell micrographs
Introduction to microscopy