Question

Answer the following questions:
1. Why some aquatic plants are able to float on water?
2. Where do fixed-floating plants bear stomata on their leaves?
3. What kind of leaves are found in desert plants?
How are underwater plants useful?
5. Why do the roots of mangrove trees grow upwards?
Name two plants that cannot prepare food and why?
15. Plants
4.
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Answer 1

• You can see many different aquatic plants in the Victoria house whose leaves and shoots float on the surface of the water. Air-filled tissues in various parts of the plant provide the buoyancy that allows them to float. In the Ludwigia helmithorrhiza in front of you, parts of the root tissue are filled with air.
• In most green plants, the stomata are located on the lower side of the leaves. According to biologists at Colby College the leaf of the water lily has about 460 stomata per square millimeter on the upper surface of their leaves while many other plants, like the garden lily, have none at all.
• Succulent plants store water in fleshy leaves, stems or roots. All cacti are succulents, as are such non-cactus desert dwellers as agave, aloe, elephant trees, and many euphorbias. Several other adaptations are essential for the water storing habit to be effective.
• Seagrasses also stabilize sediments, generate organic material needed by small invertebrates, and add oxygen to the surrounding water. Underwater vegetation in shallow coastal waters also supports a wide diversity of marine creatures by providing spawning, nursery, refuge, and foraging grounds for many species.
• Sonneratia species grow in oxygen-poor sediments. The underground root system needs and demands oxygen, the soil is not able to support the underground root system with enough oxygen, therefore the underground root system outgrows aerial roots that grow vertically up to the air above the soil.
• some species have taken a different route for nourishment. These plants, called heterotrophs (other feeding), lack chlorophyll and cannot make their own food.