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Factors affecting growth

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Plant growth is affected both by internal and external factors.

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One of the main conditions of normal plant growth …

is availability of sufficient space

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What is the main environmental factor influencing plant growth?

Any change of environmental conditions can be the reason of plant growth deterioration.

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Plant growth being affected by internal as well as external factors, environmental factors are also able to influence plant life term and reproduction.

Crop alteration and biotechnology

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People domesticate plants for the purpose of increasing the crop capacity.

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People occupy themselves with crop breeding not only for yield increase but also for …

crop plants to be tastier and more nutritious

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What technique of artificial crop breeding is proved in a practical manner?

Molecular technique that genetically modifies the plant enables to grow crops with more beneficial characteristics.

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Nowadays people are able to create crops with more advantageous characteristics through the use of plant breeding and hybridization.

Forest health

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The absence of pests and diseases in forests is undesirable.

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Insects and diseases spread more quickly nowadays due to …

faster means of forest transportation and increased scope of forest trade

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What does forest health depend on?

There should be balance of pests, diseases, optimal spread of invasive plant species and satisfactory pollution level.

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Forest health can be affected by rise of pests and diseases, wide spread of invasive plant species, increased pollution level and ways of forest plants distribution.

History of agricultural science

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The development of agricultural science is affected by environmental damage.

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Agricultural science is mostly aimed at … selecting and improving crops and animals for high productivity

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What science did the founder of agricultural science investigate? The science of genetics.

Определите основную идею текста. Agricultural science is a constantly developing science aiming at selecting and improving crops and animals for high productivity.

Botany

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Plants decrease carbon dioxide level through processing it into oxygen.

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Plants are vitally important for animals because …they rely on plants as the principal source for nutrition

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Why do people pay so great attention to the study of plant life? Plants play a tremendous role in reduction the green house effect and serve as the main source of food, fibres, fuel and medicine.

Определите основную идею текста. Plants contribute much to environment protection, provide people with food, medicine, fuel and fibres, represent the main food source for other living beings.

Technology

Date: 2015-12-11; view: 3737