Assignments to do:

I Remember:

1. The letter combinations tion pronounced as [∫n]: dictation

2. Suffix – ion forms the nouns from the verbs: to revise – revision

II Read the words according to the rules of reading of the letter combinations “tion”:

Station, nation, classification, reaction, distribution, nutrition, fixation, combination, acceleration.

III Form the nouns from the verb:

To distribute, to reduce, to dictate, to infect, to generate, to communicate, to reserve, to fascinate.

IV Find in the text nouns, which have suffix –ion

V Read the international words and guess their meaning:

Classification, microbes, phototrophs, chemotrophs, autotrops, heterotrophs, infectious.

VI Read and translate the text about classification of organisms

A nutritional classification of organisms

Microbes are distinguished by their great metabolic diversity, however, and some can sustain themselves inorganic substances by using pathways that are unavailable to either plants or animals. All organisms, including microbes, can be classified metabolically according to their nutritional pattern - their source of energy and their source of carbon.

First considering the energy source, we can generally classify organisms as phototrophs or chemotrophs. Phototrophs use light as their primary energy source, whereas chemotrophs depend on oxidation-reduction reactions of inorganic or organic compounds for energy. For their principal carbon source, autotrophs use carbon dioxide, and heterotrophs require an organic carbon source. Autotrophs are also referred to as lithotrophs, and heterotrophs are also referred to as organotrophs.

If we combine the energy and carbon sources, we derive the following nutritional classifications for organisms: photoautotrophs, photoheterotrophs, chemoautotrophs, and chemoheterotrophs(see Figure 8). Typically, infectious organisms catabolize substances obtained from the host.

VII Remember the following word and word-combinations:

To distinguish, metabolic diversity, to sustain, inorganic substances, nutritional pattern, primary energy source, oxidation-reduction reactions, principal carbon source, infectious organisms.

VIII True or false?

1. Autotrophs use organic carbon source.

2. Autotrophs are referred to as organotrophs.

3. Phototrophs use light as their primary energy source.

4. Heterotrophs use carbon dioxide.

5. Chemotrophs depend on oxidation-reduction reactions of inorganic or organic compounds.

IX Make the sentences using these words:

1. Organism, nutritional, to, is, all, classified, pattern, their.

2. Classify, we, as, or, can, generally, phototrophs, organisms, chemotrophs.

3. Source, use, carbon dioxide, an organic carbon, heterotrophs, autotrops, and, require.

4. Catabolize, from, infectious, the host, substances, from, organism, obtained.

5. Source, an organic, heterotrophs, carbon, require.

X Write the missing letters:

Inec…ious, m…crobe, heterotro…h, chemo…roph, n…tritioal, …utotroph, …hototroph, sourc…, ener…y, …etabolic, sub…tan…e.

XI Answer the questions:

1. How all organisms are classified to their nutritional pattern?

2. What do use photorophs?

3. What do use chemotrophs?

4. How are differentiated autotrophs and heterotrophs?

5. What kind of chemotrophs do you know?

XII Describe the Figure 8.

30-32 Practical lesson

Rules of reading: The letter combinations ow, ou

Word formation: suffix of noun – ment

Text: Physical Requirements for Growth of microorganisms