(20 13? In recent years, typhoons and rainstorms have continued in some areas, while others are more arid. Abnormal weather around the world highlights the seriousness.

(1) The aggravation of greenhouse effect is mainly caused by burning too much coal, oil and natural gas in modern industrial society. After burning these fuels, a large amount of carbon dioxide gas is released into the atmosphere. Carbon dioxide is also called greenhouse gas. Carbon dioxide is mainly consumed by plants for photosynthesis. Green plants use light energy to convert carbon dioxide and water into organic matter to store energy and release oxygen. It is called photosynthesis, that is, the raw materials of photosynthesis are carbon dioxide and water, and the products are organic matter and oxygen, provided that the light and place are chloroplasts, and the reaction expression is: carbon dioxide+water light, chloroplast organic matter (storing energy)+oxygen.

(2) The process [C] in the figure is that the remains of animals and plants are decomposed by bacteria and fungi, forming inorganic substances such as carbon dioxide, water and inorganic salts, and then returning to the environment to be used by plants. It can be seen that bacteria and fungi, as decomposers, promote the material circulation in nature; Animals A and B, on the other hand, eat plants directly or indirectly, and as consumers, they also promote the circulation of materials. The process of green plants converting carbon dioxide and water into organic matter for storing energy and utilizing light energy through chloroplasts, and releasing oxygen is called photosynthesis. Cells use oxygen to decompose organic matter into carbon dioxide and water, and release energy stored in organic matter to meet the needs of life activities, which is called respiration; The analysis shows that: A uses carbon dioxide and other substances to produce oxygen, and A provides food for B, which should be photosynthesis; Process b produces carbon dioxide, which should be respiration.

(3) The relationship between producers and consumers is mainly the relationship between eating and being eaten, thus forming a food chain. Cattle feed on grass, and the two belong to predatory relationship. The energy transfer efficiency in the ecosystem is 10% ~ 20%, so the weight of cattle is increased by 1 kg, and grass consumption needs at least 1 kg.

(4) The structural level of plants is: cells → tissues → organs → plants; The structural level of animal body is: cell → tissue → organ → system → animal body. The structure of animals is more than that of plants. Grass belongs to plants and cows belong to animals, so the difference between them lies in whether there is a systematic structural hierarchy.

(5) The aggravation of greenhouse effect is mainly caused by burning too much coal, oil and natural gas in modern industrial society. After burning these fuels, a large amount of carbon dioxide gas is released into the atmosphere, which is also called greenhouse gas. Because of the global carbon cycle, the United Nations formulated the Kyoto Protocol to slow down the emission of carbon dioxide gas. According to the analysis in the figure, the main reason of global warming is that the burning of coal, oil and natural gas produces a lot of carbon dioxide.

So the answer is (1) carbon dioxide; Carbon dioxide+water, light, chloroplast organic matter (energy storage)+oxygen;

(2) saprophytic bacteria and fungi; Consumers; Photosynthesis; Breathe;

(3) predation; 5;

(4) Cattle have more hierarchy of system structure;

(5) The combustion of coal, oil and natural gas produces a lot of carbon dioxide.