25-3 Plant Adaptations Slide 2 of 29
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1 2 of 29
2 Aquatic Plants How are plants adapted to different environments? 3 of 29
3 Aquatic Plants Aquatic Plants To take in sufficient oxygen, many aquatic plants have tissues with large air-filled spaces through which oxygen can diffuse. 4 of 29
4 Aquatic Plants Mangroves have specialized air roots with air spaces in them. These spaces conduct air down to the buried roots, allowing root tissues to respire normally. Bald cypress trees grow structures called knees, which protrude above the water. The knees bring oxygen-rich air down to the roots. 5 of 29
5 Aquatic Plants The reproductive adaptations of aquatic plants include seeds that float in water and delay germination for long periods. Many aquatic plants grow quickly after germination, extending the growing shoot above the water s surface. 6 of 29
6 Salt-Tolerant Plants Salt-Tolerant Plants When plant roots take in dissolved minerals, a difference in concentration of water molecules is created between root cells and the surrounding soil. This concentration difference causes water to enter the root cells by osmosis. For plants that grow in salt water, this means taking in much more salt than the plant can use. 7 of 29
7 Salt-Tolerant Plants The roots of salt-tolerant plants are adapted to salt concentrations that would quickly destroy the root hairs on most plants. The leaves of these plants have specialized cells that pump salt out of the plant tissues and onto the leaf surfaces, where it is washed off by rain. 8 of 29
8 Desert Plants Desert Plants Plants that live in the desert biome are called xerophytes. Xerophytes must tolerate a variety of extreme conditions, including strong winds, daytime heat, sandy soil, and infrequent rain. 9 of 29
9 Desert Plants Plant adaptations to a desert climate include extensive roots, reduced leaves, and thick stems that can store water. 10 of 29
10 Desert Plants Cactuses have root systems that spread out for long distances just beneath the soil surface or reach deep down into the soil. To reduce water loss due to transpiration, cactus leaves have been reduced to thin, sharp spines. 11 of 29
11 Desert Plants Cactuses have thick green stems that carry out photosynthesis and are adapted to store water. The stems of cactuses swell during rainy periods and shrivel during dry spells, when the plants are forced to use up their water reserves. 12 of 29
12 Desert Plants Seeds of many desert plants can remain dormant for years, germinating only when sufficient moisture guarantees them a chance for survival. When rain does come, the plants mature, flower, and seed in a matter of weeks or even days, before the water disappears. 13 of 29
13 Nutritional Specialists How do plants obtain nutrients from sources other than photosynthesis? 14 of 29
14 Nutritional Specialists Nutritional Specialists Plants that have specialized features for obtaining nutrients include carnivorous plants and parasites. 15 of 29
15 Nutritional Specialists Carnivorous Plants Some plants that live in wet and acidic environments with little or no nitrogen present obtain nutrients using specialized leaves that trap and digest insects. The leaf secretes enzymes that digest the insect and release nitrogen for the plant to use. 16 of 29
16 Nutritional Specialists The best known of the carnivorous plants is the Venus flytrap. 17 of 29
17 Nutritional Specialists Parasites Some plants extract water and nutrients directly from a host plant. Like all parasites, these plants harm their host organisms and sometimes even pose a serious threat to other species. Cuscuta is a parasitic plant that grows directly into the vascular tissue of its host. There, it extracts nutrients and water. 18 of 29
18 Epiphytes Epiphytes Epiphytes are plants that are not rooted in soil but instead grow directly on the bodies of other plants. Most are found in the tropical rain forest biome, but they also grow in other moist biomes. 19 of 29
19 Epiphytes Epiphytes are not parasites. They gather their own moisture, generally from rainfall, and produce their own food. One of the most common epiphytes is Spanish moss. 20 of 29
20 Chemical Defenses Chemical Defenses Plants are an important source of food for insects. How do plants defend themselves from insects? 21 of 29
21 Chemical Defenses Many plants defend themselves against insect attack by manufacturing compounds that have powerful effects on animals. 22 of 29
22 Chemical Defenses Some of these chemicals are poisons that can be lethal if eaten. Others act as insect hormones, disrupting normal development and preventing insects from reproducing. 23 of 29
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