Прочитайте текст и выполните задания Plant ecology 1. Plant ecology describes the ways plants relate...: ответ на тест 1110548 - Английский язык

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Plant ecology
1. Plant ecology describes the ways plants relate to and function in their habitats, the environments in which they complete their life cycles. Plants depend upon certain edaphic and climatic factors in their environment but may also modify these factors by e.g. decreasing albedo, increasing interception of runoff and stabilization of soils.
2. Plants compete with other organisms in their ecosystem for resources. They interact with their neighbours at a variety of spatial scales in groups, populations and communities that collectively constitute vegetation. Biomes such as tundra and tropical rainforest, are regions with similar abiotic and biotic factors, climate, and geography with characteristic dominant plants.
3. Herbivores eat plants, but plants can also defend themselves and some species are parasitic or even carnivorous. Other organisms form mutually beneficial relationships with plants. For example mycorrhizal fungi provide plants with nutrients, ants are recruited by ant plants to provide protection, honey bees and other pollinators pollinate flowers, and dispersal vectors distribute spores and seeds.
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Plant ecology
1. Plant ecology describes the ways plants relate to and function in their habitats, the environments in which they complete their life cycles. Plants depend upon certain edaphic and climatic factors in their environment but may also modify these factors by e.g. decreasing albedo, increasing interception of runoff and stabilization of soils.
2. Plants compete with other organisms in their ecosystem for resources. They interact with their neighbours at a variety of spatial scales in groups, populations and communities that collectively constitute vegetation. Biomes such as tundra and tropical rainforest, are regions with similar abiotic and biotic factors, climate, and geography with characteristic dominant plants.
3. Herbivores eat plants, but plants can also defend themselves and some species are parasitic or even carnivorous. Other organisms form mutually beneficial relationships with plants. For example mycorrhizal fungi provide plants with nutrients, ants are recruited by ant plants to provide protection, honey bees and other pollinators pollinate flowers, and dispersal vectors distribute spores and seeds.
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Planting cereals
1. The warm-season cereals are grown in tropical lowlands year-round and in temperate climates during the frost-free season. Rice is commonly grown in flooded fields, though some strains are grown on dry land. Other warm climate cereals, such as sorghum, are adapted to arid conditions.
2. Cool-season cereals are well-adapted to temperate climates. Most varieties of a particular species are either winter or spring types. Winter varieties are sown in the autumn, germinate and grow vegetatively, then become dormant during winter. They resume growing in the springtime and mature in late spring or early summer. This cultivation system makes optimal use of water and frees the land for another crop early in the growing season.
3. Winter varieties do not flower until springtime because they require vernalization: exposure to low temperature for a genetically determined length of time. Where winters are too warm for vernalization or exceed the hardiness of the crop (which varies by species and variety), farmers grow spring varieties. Spring cereals are planted in early springtime and mature later that same summer, without vernalization. Spring cereals typically require more irrigation and yield less than winter cereals.
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Agricultural policy
1. Agricultural policy is the set of government decisions and actions relating to domestic agriculture and imports of foreign agricultural products. Governments usually implement agricultural policies with the goal of achieving a specific outcome in the domestic agricultural product markets.
2. Some overarching themes include risk management and adjustment (including policies related to climate change, food safety and natural disasters), economic stability (including policies related to taxes), natural resources and environmental sustainability (especially water policy), research and development, and market access for domestic commodities (including relations with global organizations and agreements with other countries).
3. Agricultural policy can also touch on food quality, ensuring that the food supply is of a consistent and known quality, food security, ensuring that the food supply meets the population’s needs, and conservation. Policy programs can range from financial programs, such as subsidies, to encouraging producers to enroll in voluntary quality assurance programs.
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Factory farming
1. Factory farming involves raising livestock in confinement at high stocking density, where a farm operates as a business – a practice typical in industrial farming by agribusinesses. The main products of this industry are meat, milk and eggs for human consumption. There have been issues regarding whether factory farming is sustainable and ethical.
2. Confinement at high stocking density is one part of a systematic effort to produce the highest output at the lowest cost by relying on economies of scale, modern machinery, biotechnology, and global trade. Confinement at high stocking density requires antibiotics and pesticides to mitigate the spread of disease and pestilence exacerbated by these crowded living conditions. In addition, antibiotics are used to stimulate livestock growth by killing intestinal bacteria.
3. There are differences in the way factory farming techniques are practiced around the world. There is a continuing debate over the benefits, risks and ethical questions of factory farming. The issues include the efficiency of food production; animal welfare; whether it is essential for feeding the growing global population; the environmental impact and the health risks.
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A vitamin
1. A vitamin is an organic compound required by an organism as a vital nutrient in limited amounts. An organic chemical compound is called a vitamin when it cannot be synthesized in sufficient quantities by an organism, and must be obtained from the diet.
2. Vitamins have diverse biochemical functions. Some have hormone-like functions as regulators of mineral metabolism (such as vitamin D), or regulators of cell and tissue growth and differentiation (such as some forms of vitamin A). Others function as antioxidants (e.g., vitamin E and sometimes vitamin C). The largest number of vitamins (such as B complex vitamins) functions as precursors for enzyme cofactors that help enzymes in their work as catalysts in metabolism.
3. Until the mid-1930s, when the first commercial yeast-extract vitamin B complex and semi-synthetic vitamin C supplement tablets were sold, vitamins were obtained solely through food intake, and changes in diet (which, for example, could occur during a particular growing season) usually greatly altered the types and amounts of vitamins ingested. However, vitamins have been produced as commodity chemicals and made widely available as inexpensive semisynthetic and synthetic-source multivitamin dietary and food supplements and additives, since the middle of the 20th century.
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