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Test:5th Grade Science
| 1. | Plants and trees can grow in a wide variety of environments. Whether they grow in the desert or the rainforest, they all have one thing in common, air and water are necessary for life and growth. Depending on the plant’s adaptations, the amount of water needed to survive varies. Some plants, like those in the desert, need very little water to grow. Plants primarily get the materials for growth from the air and water. Sunlight provides the energy that is required to create food through photosynthesis. We often see plants in soil, but it isn’t necessary for growth. 水培法是种植植物的系统soil. Nutrients are added to water and delivered directly through a plant’s roots. Plants do not gain anything from the earth itself; they absorb nutrients from within the soil. If those nutrients are added to the water, and the plant is in the open air, then the soil is not needed. Plants take in carbon dioxide from the air and convert it into glucose through the process of photosynthesis, which is powered by sunlight. Hydroponics come in numerous forms: the plants can be hung vertically, and the roots are sprayed, or roots may be submerged in water through a series of tubs, containers, or even coconut husks! Why is water important to a plant's survival? |
Water is necessary to clean the plants and keep predators off of them.
Water soaks into the plant and provides it with the carbon dioxide needed.
Water is not crucial to a plant's survival or growth.
Water transports nutrients to plants and keeps them cool during transpiration.
