I. READING IN CLASS

Text 1

I.Read the text and state what it is about.

ANIMAL - PLANT DIFFERENCES

Although you may place organisms without difficulty in either the plan or the animal kingdom, it is essential to know the basic nutritional differences these two groups.

Plants require sunlight energy to build up their complex organic compounds (starch, for example) from the simpler inorganic foods hey absorb. This process is not only dependent on sunlight, but requires the presence of the green pigment chlorophyll, and a supply of water and carbon dioxide within the plant, before it oar take place. Animals do not carry out such a synthesis; they take in readymade organic compounds by feeding on other organisms either living or dead. Thus, plants are the only organisms capable of making organic compounds and animals are dependent on them, either directly or their supply of these substances.

Animals also differ from the plants in the structure of their cells. Those of animals are bounded by a very thin layer of special protoplasm (a protoplasmic membrane), those of plants have a much thicker layer of dead material outside the protoplasmic membrane. This thick layer (the cell wall) is usually made of an organic substance called cellulose . Furthermore, plant cells generally have spaces or vacuoles full of cell sap within their protoplasm. Chlorophyll is not found in animal cells, but is present in small disc-shaped bides (chloroplasts) in the protoplasm of many plant cells.

The nucleus is a more or less spherical body present in both cell types.

II. Remember the following words, consult a dictionary about the way they are pronounced: