The stem of my plantTuesday, January 29, 2008
Wednesday, January 23, 2008
plant
From wikipedia.org
Dracaena sanderiana
Kingdom: plantae
Division : magnoliophyta
Class : liliopsida
Order: asparagales
Family: ruscaceae
Genus: dracaena
Species: D. sanderiana
Dracaena sanderiana, known as Ribbon Dracaena, lucky bamboo or sometimes Ribbon Plant, is a species of Dracaena, native to Cameroon in tropical west Africa. It is one of a group of small, shrubby species with slender stems and flexible strap-shaped leaves that grow as understory plants in rainforests. It is an upright shrub growing to 1.5 m tall, with leaves 15-25 cm long and 1.5-4 cm broad at the base.
Dracaena sanderiana and related species are popular houseplants, with numerous cultivars sold. It can survive in many indoor conditions, but indirect lighting is best as direct sunlight can cause the leaves to turn yellow and burn.
Although it grows better in soil, it often is sold with the roots in water. The water should be completely changed every two weeks. The water should be bottled water, or soft tap water with very little fluorine. It does best in bright, indirect lighting and temperatures above 15 °C up to 25 °C.
Yellow or brown leaf edges may be caused by too much direct light or fluoridated or chlorinated water, the latter of which can be prevented by leaving tap water exposed to the air for a day before plant use. Salty or softened water can also cause this.
Twisted shapes can be produced by rotating the plant with respect to gravity and directed light sources. This is difficult to achieve for most home users, but not impossible with a little time and patience.
Dracaena sanderiana
Kingdom: plantae
Division : magnoliophyta
Class : liliopsida
Order: asparagales
Family: ruscaceae
Genus: dracaena
Species: D. sanderiana
Dracaena sanderiana, known as Ribbon Dracaena, lucky bamboo or sometimes Ribbon Plant, is a species of Dracaena, native to Cameroon in tropical west Africa. It is one of a group of small, shrubby species with slender stems and flexible strap-shaped leaves that grow as understory plants in rainforests. It is an upright shrub growing to 1.5 m tall, with leaves 15-25 cm long and 1.5-4 cm broad at the base.
Dracaena sanderiana and related species are popular houseplants, with numerous cultivars sold. It can survive in many indoor conditions, but indirect lighting is best as direct sunlight can cause the leaves to turn yellow and burn.
Although it grows better in soil, it often is sold with the roots in water. The water should be completely changed every two weeks. The water should be bottled water, or soft tap water with very little fluorine. It does best in bright, indirect lighting and temperatures above 15 °C up to 25 °C.
Yellow or brown leaf edges may be caused by too much direct light or fluoridated or chlorinated water, the latter of which can be prevented by leaving tap water exposed to the air for a day before plant use. Salty or softened water can also cause this.
Twisted shapes can be produced by rotating the plant with respect to gravity and directed light sources. This is difficult to achieve for most home users, but not impossible with a little time and patience.
Plant Lab
We will be doing a plant lab analyzing a plant and its properties. its supposed to be a college lab and its due february 8 bwcause terrinca's IA is due the 25th. I will be posting information on the plant up here.
Outline the wide diversity in the plant kingdom as exemplified by the structural differences between bryophytes, filicinophytes, coniferophytes and angiospermophytes.
Bryophytes (mosses and liverworts):
No roots, vascular system, or cuticle.
Rhizoids similar to root hairs.
Mosses with simple leaf-like structures.
Liverworts have flattened shape called a thallus.
Filicinophytes (ferns):
Roots, leaves in fronds, and vascular system.
Cuticle on leaves.
Can form small trees but not woody.
Coniferophytes (conifers):
Shrubs to very large trees.
Advanced vascular system.
Woody stems and roots.
Angiospermophytes (flowering plants):
Highly variable in structure-tiny herbaceous to large trees
Roots, stems and leaves.
Advanced vascular system.
Can form woody tissue.
Explain the relationship between the distribution of tissues in the leaves and the function of these tissues.
Vascular tissue-
Continuous throughout the plant and is involved in the transport of materials between the roots and the shoots of the plant.
Dermal tissue-
generally a single layer of tightly packed cells that cover and prtect all young parts of the plant.
most stems secrete a waxy coating, the cuticle, that helps the areial parts of the plant retain water.
root hairs are extensions of the epididymis cells near the tips of the roots.
Ground tissue-
neither dermal nor vascular in dicot stems, its divided into pith internal vascular tissue and cortex external tissue. the function of the ground tissue is photosynthesis, storage, and support.
Outline four adaptations of xerophytes
spines instead of leaves reduce rate of transpiration
thick stems contain high amounts of water storage tissue
thick waxy cuticle
vertical stems - absorbs sunlight late and early in the day but not midday when sun is too hot
Outline two structural adaptations of hydrophytes
Air spaces in leaves create buoyancy
Waxy cuticle on upper surface of leaves
Bryophytes (mosses and liverworts):
No roots, vascular system, or cuticle.
Rhizoids similar to root hairs.
Mosses with simple leaf-like structures.
Liverworts have flattened shape called a thallus.
Filicinophytes (ferns):
Roots, leaves in fronds, and vascular system.
Cuticle on leaves.
Can form small trees but not woody.
Coniferophytes (conifers):
Shrubs to very large trees.
Advanced vascular system.
Woody stems and roots.
Angiospermophytes (flowering plants):
Highly variable in structure-tiny herbaceous to large trees
Roots, stems and leaves.
Advanced vascular system.
Can form woody tissue.
Explain the relationship between the distribution of tissues in the leaves and the function of these tissues.
Vascular tissue-
Continuous throughout the plant and is involved in the transport of materials between the roots and the shoots of the plant.
Dermal tissue-
generally a single layer of tightly packed cells that cover and prtect all young parts of the plant.
most stems secrete a waxy coating, the cuticle, that helps the areial parts of the plant retain water.
root hairs are extensions of the epididymis cells near the tips of the roots.
Ground tissue-
neither dermal nor vascular in dicot stems, its divided into pith internal vascular tissue and cortex external tissue. the function of the ground tissue is photosynthesis, storage, and support.
Outline four adaptations of xerophytes
spines instead of leaves reduce rate of transpiration
thick stems contain high amounts of water storage tissue
thick waxy cuticle
vertical stems - absorbs sunlight late and early in the day but not midday when sun is too hot
Outline two structural adaptations of hydrophytes
Air spaces in leaves create buoyancy
Waxy cuticle on upper surface of leaves
Thursday, December 20, 2007
Question 2
Outline the wide diversity of the different plant phylums including bryophyta, Lycophyta, Cycadophyta, Sphenophyta, Filicinophyta, Ginkophyta, Coniferophyta, Dicotyledons.
Botany Q&A
Explain how the root system provides a large surface area for mineral ion and water uptake by means of branching, root hairs, and cortex cell walls.
Oh But Why????
Once again Ghosh is forcing us into the 21st century and having us create a blog. I am an IB Biology student and we are making a blog for our section on plants. It will mostly be for homework and classwork and class discussions.
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