Content 8.1 Support Systems in Animals 8.2 Support Systems in Plants 8.3 Appreciating the Support System in Living Things
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8.1 Support Systems in Animals yschow@smkbpj(a)
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Vertebrate and invertebrate • Vertebrates are animals with backbones. • Invertebrates are animals without backbones.
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Vertebrates
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Vertebrate • Vertebrates are supported by internal skeleton of bones called endoskeleton.
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Vertebrate The functions of endoskeleton are: (a) to support the body weight (b) to protect the internal organs (c) to maintain the shape of the body
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Land Vertebrate • The land vertebrates have to support their own body weight. • Hence, the endoskeletons of land vertebrates are normally big and strong. strong
Horse skeleton
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Elephant skeleton
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Aquatic Vertebrate • The body weight of aquatic vertebrates is supported by the buoyancy of water. Hence, the endoskeletons of aquatic vertebrates are smaller. whale skeleton
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Invertebrate The support systems of invertebrates consist of i. exoskeleton and ii. hydrostatic skeleton.
exoskeleton
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hydrostatic skeleton
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Invertebrate- Exoskeleton • Cuticle is an exoskeleton which is made of chitin. • It covers and protects the body. • Bees, flies, cockroaches , scorpions, crabs and prawns are supported by cuticle.
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Invertebrate- Hydrostatic skeleton • Invertebrates which have soft bodies such as worms, leeches and caterpillars are supported by the body fluid pressure called hydrostatic pressure.
Earth worms
Leeches yschow@smkbpj(a)
Caterpillars
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8.2 Support Systems in Plants yschow@smkbpj(a)
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Woody plants • The woody plants are supported by woody tissues. • Some of the examples of woody trees are rubber trees, rambutan trees and durian trees. yschow@smkbpj(a)
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Woody plant • Some woody plants have additional features to help them. (a) Buttress roots (b) Prop roots (c) Stilt roots
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Buttress roots • Casuarina trees have buttress roots to provide additional support to the stems.
Casuarinas 木麻黄树 ச மரக yschow@smkbpj(a)
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Prop roots • Banyan trees and maize plants have prop roots to give them extra support
Banyan trees = Pokok Ara yschow@smkbpj(a) ஆலமர மரக 榕树
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Stilt roots • Mangrove trees have stilt roots which provide extra support to the stem and help them to obtain sunlight.
Mangrove trees = pokok bakau 红树 ச நில yschow@smkbpj(a)
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Non-woody plant • Non-woody plants have soft stems. • The turgidity of the cells provides support to these non-woody plants. • Some of the examples of non-woody plants are yam plant, leafy vegetables and balsam plant. yschow@smkbpj(a)
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Non-woody plant • Some non-woody plants have weak stems which are unable to support the plants. • However, they have other features to help them. (a) Tendrils (b) Thorns and prickles (c) Twining stems (d) Clasping roots yschow@smkbpj(a)
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Tendrils • Cucumber plants and pumpkin plants climb and grow upwards using tendrils.
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Thorns and prickles • Bougainvillea plants, rattan plants and rose plants climb using thorns
Rattan
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Prickles
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Twining stems • Morning glory plants twine around other plants to help them climb higher in order to get enough sunlight.
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Clasping roots • Money plants and pepper plants climb by clasping.
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