Archive for April 13th, 2009
Lifecycle of a flowering Plant
This page introduces you to the basic steps in the lifecycle of flowering plants.
: sprouting of the seed. Timing is critical. Germinating too early, too late, or in the wrong place spells death. Plants use various germination cues. These include the ratio of daylight to darkness, temperature, moisture (timing and quantity), fire, abrasion, and even animal digestive enzymes. For example, passing through the digestive system of an animal usually indicates that the seed has been dispersed (moved away) from its parent (so won’t compete), that the seed might be deposited under a nurse tree if the animal is a bird that defecated while perched, and that there is some fertilizer.
life cycle of a flowering plant
Germination
Growth: development from seedling to mature plant.
Reproduction: production of offspring.
Egg/Sperm Production:
- eggs are produced in the ovary, along with two polar nuclei per egg
- sperm is produced and packaged in the anther (2 sperm cells per pollen grain)
- Double Fertilization: when pollen is accepted by the stigma, a pollen tube grows down the style and into the ovary. Both sperm cells from the pollen grain travel down the pollen tube to the ovary. One sperm cell fertilizes the egg to form the zygote which develops into the embryo and eventually the new plant. The other sperm cell fuses with the two polar nuclei to form the endosperm which provides food for the embryo. (Next time you eat a peanut, look for the small embryo, which has the leaves; the rest is endosperm (see picture).
- Seed Production: the embryo and endosperm are surrounded by a seed coat to form the seed.
- Seed Dispersal: movement of seeds away from parent. Seed dispersal is critical to avoid competition with the parent plant and to occupy new, maybe better, sites. Plants use various, ingenious methods to disperse their seeds (e.g., hooked seeds to stick on a passing animal, edible ovary to be eaten and dispersed by an animal, etc.).
Death: if plants die after less than a year, then they are called annuals (or ephemerals). If plants die after two years, then they are called biennials, and if they live for more than two years, then they are called perennials.
Sooner or later this vegetative stage will come to an end, and this plant will enter a stage of the plant life cycle called the flowering stage. Bsci 124 lecture notes — flowering plants flowering plant life cycle of a flowering plant cycle flowering plants (angiosperms) belong to the vascular. Life cycle of a flowering plant select item below: curriculum support. Fast plants life cycle environmental issues question: what are the stages of a flowering plant’s life cycle the stages of flowering plant’s life cycle starts as a seed then the seedling,mature plant. Life cycle of a flowering plant life cycle in flowering plants how does a seed germinate – (72k pdf file) observe your fast plant seed while it germinates and learn more about this exciting process as you record.
Each stage of the plant life cycle easily explained fast plants life cycle seed to seed in 35 days 1990 wisconsin fast plants and questions beginning the life cycle: growth, development and flowering beginning the life cycle. Fast plants : life cycle in flowering plants science at key stages 1 and 2 (year 5) unit 5b: life cycles section 6: the life cycle of flowering plants. Plant printouts – enchantedlearning.com flowering plant life cycle sequencing cards cut out the four cards and arrange them so they show the life cycle of a flowering plant from seed to flower. Flowering plant life cycle stage 1: fertilised seed a dormant seed lies waiting in the ground it needs water, oxygen and warmth (wow) if it is to successfully develop into a flowering plant.
Sampaguita Flower
sampaguita flower
Sampaguita Flower (scientific name Jasminum sambac) is a species of the genus jasmine and is widely grown as an ornamental plant. This species is native to southern Asia, India and Sri Lanka. The Sampaguita plant is a semi-climbing, evergreen shrub that reaches to a height of 1-3 meter. Leaves are simple, ovate and are arranged, either on opposite sides or in whorls of three. Sampaguita flower is white in color and is produced either singly or in clusters of three or more, at times twelve. The flower opens at night and withers within 2 days. Occasionally, purple-black fruits are formed.
Classification of Sampaguita Flower
Sampaguita flower is a Spanish term, which comes from the Filippino words sumpa kita meaning ‘I promise you’. Like every flower signifies its own flower meaning, Sampaguita flower is a symbol of purity, devotion, dedication, fidelity and strength. Let us look at the classification of the Sampaguita flower.
Kingdom: Plantae
Division: Magnoliophyta
Class: Magnoliopsida
Order: Lamiales
Family: Oleaceae
Genus: Jasminum
Species: sambac
There are three varieties of Sampaguita flower, based on the petal structure and arrangement viz. single petal (singled petal flowers with five oval shaped petals), double petal (singled and doubled petal flowers with elongated petals) and double double (semi doubled and doubled petal flowers).
Cultivation and Uses of Sampaguita Flower
sampaguita flowers
Sampaguita flower is the national flower of Philippines (adopted in 1937) and Indonesia (adopted in 1990). It is believed that Sampaguita plant was imported to Philippines, from the Himalayan regions, in the 17th century.
The constituents of Sampaguita flower are iron, glycosides, tannin, fats, silicon and calcium oxalate. There are many uses of Sampaguita flower, some of the common uses are:
- Oil extracted from Sampaguita flower is used in cosmetics such as perfumes, deodorants, hair oils and other body care lotions.
- Sampaguita flower due to its fragrance, is used for hair ornamentation in Philippines, India and China.
- The Sampaguita flower is used as herbal medicine; many people used it for alleviation of ailments such as headaches, fever, cough, diarrhea and abdominal pain. Sampaguita petals are used for preparing herbal tea.
- Sampaguita roots are ground and used for treatment of cuts and snake bites. The leaves and flowers also contain ingredients for use as antipyretics and decongestants.
A garland made from Sampaguita flower is used to welcome guests. In many of the countries, Sampaguita is regarded as auspicious and is used in religious ceremonies.
Growth and Propagation of Sampaguita Flower
Since fruits are formed rarely, the mode of propagation is by cutting. The plant cuttings are easy to root and they are suitable in any type of soil, provided there is optimum plant growth factors. As the plant increases in height, tie the stem with supports. Sampaguita grows better in soil enriched with organic matter and farmyard compost. Keep the soil moist by regularly watering the plant. However, make sure the soil is not waterlogged, as it can cause rotting of the roots.
They can be grown in areas, where there is availability of full sun or semi-shade. For better growth of Sampaguita flower, you can replace the pot with a larger size one, whenever the plant overgrows the pot. In case, you want to maintain the size of Sampaguita plant, you can prune the plants regularly after flowering. As Sampaguita plants require maximum light for blooming, exposure of the plants to sunlight as far as possible during blooming season is advisable.
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