Question

Как растения удерживают воду

Answer 1

Суккуленты(от латинского сочный).растут они преимущественно в пустынях ,где мало воды, поэтому растения должны экономно её расходовать.у них есть толстая кутикула,а часто поверх неё и восковой налёт.в клетках суккулентов много слизистых веществ, которые прочно удерживают воду.

Answer 2

биологи 6 класс???? рабочая тетрадь

Answer 3

How Plants Retain Water

Plants have various mechanisms to retain water and prevent excessive water loss. These mechanisms help them survive in different environments, including arid regions. Here are some ways in which plants retain water:

1. Cuticle: The outermost layer of a plant's leaves and stems is covered by a waxy layer called the cuticle. The cuticle acts as a waterproof barrier, reducing water loss through evaporation. It helps to prevent dehydration by minimizing the amount of water that escapes from the plant's surface.

2. Stomata: Stomata are tiny openings found on the surface of leaves and stems. They allow gases, including carbon dioxide and oxygen, to enter and exit the plant. However, they also facilitate water loss through transpiration. To regulate water loss, plants can control the opening and closing of stomata. In hot and dry conditions, plants close their stomata to reduce water loss.

3. Xerophytes: Xerophytes are plants that have adapted to survive in dry environments. They have specialized features that help them conserve water. For example, some xerophytes have reduced leaf surfaces or modified leaf structures, such as spines or hairs, to reduce water loss through transpiration. Others have extensive root systems to absorb water from deep in the soil.

4. Succulence: Some plants, known as succulents, have specialized tissues that can store water. These tissues, such as fleshy leaves or stems, allow the plants to store water during periods of rainfall or high humidity. They can then use this stored water during dry periods when water is scarce.

5. Root Adaptations: Plants can also retain water through their root systems. Some plants have long taproots that can reach deep into the soil to access water sources. Others have shallow, wide-spreading roots that can quickly absorb water after rainfall. Additionally, some plants have root structures that allow them to form symbiotic relationships with fungi, which help increase their water absorption capabilities.

6. Crassulacean Acid Metabolism (CAM): Certain plants, such as cacti and succulents, use a specialized form of photosynthesis called CAM. CAM plants open their stomata at night to take in carbon dioxide and store it as an organic acid. During the day, when the stomata are closed to reduce water loss, the plants use the stored organic acids to carry out photosynthesis. This adaptation allows CAM plants to conserve water by minimizing daytime water loss.

In summary, plants have evolved various strategies to retain water and survive in different environments. These strategies include the presence of a cuticle, the regulation of stomata, the development of specialized structures in xerophytes, the storage of water in succulent tissues, root adaptations, and the use of CAM photosynthesis in certain plants. These mechanisms work together to help plants conserve water and maintain their hydration levels in different conditions