ВУЗ:
Составители:
Рубрика:
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:
nutritional питательный
starch крахмал
chlorophyll хлорофилл
protoplasm протоплазма
cellulose клетчатка, целлюлоза
furthermore к тому же
vacuole вакуоль
sap сок
(растений)
disk-shaped дискообразный
chloroplast хлоропласт
nucleus (pl.nuclei) (бот.) косточка плода
3
Страницы
- « первая
- ‹ предыдущая
- …
- 2
- 3
- 4
- 5
- 6
- …
- следующая ›
- последняя »
