(2) Water vapor pores
(3) Green plants? Photosynthetic
Test and analysis: (1) We know that seeds must meet certain external conditions such as moisture, suitable temperature and sufficient air in order to germinate; Its own conditions are complete and dynamic embryos and nutrients needed for embryo development; The seeds are not dormant. (2) Only about 1% of the water absorbed by plants from the soil through roots participates in the composition of plants, and more than 99% of the water is emitted to the atmosphere in the form of water vapor from the stomata of leaves through transpiration, which is not a waste of water, and transpiration is of great significance. First of all, it provides upward motivation for plants to absorb water. At the same time, inorganic salts dissolved in water are absorbed and transported together. Second, transpiration can increase the humidity of the atmosphere and increase precipitation. Third, transpiration can take away the heat in plants, so that plants will not be roasted to death in hot summer. Fourth, promote the water circulation in the biosphere. (3) (3) There are a large number of animals living in the forest, including herbivores, carnivores and omnivores. Their food comes directly or indirectly from green plants. The respiration of animals and plants consumes oxygen to produce carbon dioxide, and absorbs carbon dioxide and oxygen through the photosynthesis of green plants to realize the balance of carbon and oxygen in forest ecosystem. So the answer is: (1) Suitable temperature.
(2) Water vapor pores
(3) Green plants? Photosynthetic