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Stems for Stem
Quiz by Jalen Kenny
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Academic Talk: Sentence Stems for students
Meine Pläne: adding -er to verb stems for male agent nouns, extended writing
Ornamental horticulture is growing of plants for decorative and beauty purposes. â˘There many different types of flowers such as, daisies, roses and lilies. Establishment of flower beds â˘Choose the best place or site for your flower bed. â˘The site should get enough sun and have fertile soil. â˘After choosing the site, dig the area to a depth of 20- 30 cm. â˘Remove any large stones or rubbles as you dig. â˘Use a rake to level the prepared bed. This will also break up any big lumps of soil. varieties of flowers âFlame lilly âRose âMarigold âLavender star Propagation of flowers ⢠Flowers can be grown from seeds or cuttings, tubers and bulbs. From seeds From cuttings From tubers and bulbs Petunia roses Flame lilly Dahlia Elephant ear Lavender marigold Planting time ⢠Flowers can be planted all year round depending on the suitable varieties. â˘In winter they can be planted in pots, beds and greenhouses. â˘Varieties which need a lot of water should be grown during the rainy season. Management of flowers 1. weeding: ensure that the flower beds are weed free. â˘Weeds are removed by hand pulling with the help of a hand fork. 2. watering: watering should be done regularly during the dry season and less frequently during the rainy season. â˘make sure the beds are moist but avoid waterlogging. 3. fertilizing: soil should be well fertilized with super phosphate at planting. â˘Flowers should not be top dressed with ammonium nitrate as this will affect flower production. 4. pruning: use a pair of secateurs or very sharp knife to remove weak shoots and dead or diseased parts of the plant. â˘Pruning also encourages new growth and controls the height of the flowers. Harvesting â˘Cut the flowers in early bloom. â˘Allow 30cm stems, grade and remove lower leaves. â˘Tie in bundles â˘label accordingly, cure by setting 20cm of the stem in boiling water for 20 minutes. (this will make the flowers last longer) â˘Store the flowers in cool conditions Marketing ⢠Flowers need fast transport to the market. ⢠Flowers can be sold in bundles, boxes or in pots. ⢠Flowers are sold in bouquets at a local market or are packed in boxes for export market. ⢠They are bought for different occasions such as weddings, funerals and parties.
Lesson 2: Plate Tectonics There are a few handfuls of major plates and dozens of smaller, or minor, plates. Six of the majors are named for the continents embedded within them, such as the North American, African, and Antarctic plates. Though smaller in size, the minors are no less important when it comes to shaping the Earth. The tiny Juan de Fuca plate is largely responsible for the volcanoes that dot the Pacific Northwest of the United States. The plates make up Earth's outer shell, called the lithosphere. (This includes the crust and uppermost part of the mantle.) Churning currents in the molten rocks below propel them along like a jumble of conveyor belts in disrepair. Most geologic activity stems from the interplay where the plates meet or divide. The movement of the plates creates three types of tectonic boundaries: convergent, where plates move into one another; divergent, where plates move apart; and transform, where plates move sideways in relation to each other. They move at a rate of one to two inches (three to five centimeters) per year. Convergent BoundariesWhere plates serving landmasses collide, the crust crumples and buckles into mountain ranges. India and Asia crashed about 55 million years ago, slowly giving rise to the Himalaya, the highest mountain system on Earth. As the mash-up continues, the mountains get higher. Mount Everest, the highest point on Earth, may be a tiny bit taller tomorrow than it is today. These convergent boundaries also occur where a plate of ocean dives, in a process called subduction, under a landmass. As the overlying plate lifts up, it also forms mountain ranges. In addition, the diving plate melts and is often spewed out in volcanic eruptions such as those that formed some of the mountains in the Andes of South America. At ocean-ocean convergences, one plate usually dives beneath the other, forming deep trenches like the Mariana Trench in the North Pacific Ocean, the deepest point on Earth. These types of collisions can also lead to underwater volcanoes that eventually build up into island arcs like Japan. Divergent Boundaries At divergent boundaries in the oceans, magma from deep in the Earth's mantle rises toward the surface and pushes apart two or more plates. Mountains and volcanoes rise along the seam. The process renews the ocean floor and widens the giant basins. A single mid-ocean ridge system connects the world's oceans, making the ridge the longest mountain range in the world. On land, giant troughs such as the Great Rift Valley in Africa form where plates are tugged apart. If the plates there continue to diverge, millions of years from now eastern Africa will split from the continent to form a new landmass. A mid-ocean ridge would then mark the boundary between the plates. Transform Boundaries The San Andreas Fault in California is an example of a transform boundary, where two plates grind past each other along what are called strike-slip faults. These boundaries don't produce spectacular features like mountains or oceans, but the halting motion often triggers large earthquakes, such as the 1906 one that devastated San Francisco.
PLANT PROPAGATION Plant propagation is the process of creating new plants. There are two types of propagation: sexual and asexual. Sexual reproduction is the union of the pollen and egg, drawing from the genes of two parents to create a new, third individual. Sexual propagation involves the floral parts of a plant. Asexual propagation involves taking a part of one parent plant and causing it to regenerate itself into a new plant. The resulting new plant is genetically identical to its parent. Asexual propagation involves the vegetative parts of a plant: stems, roots, or leaves. (Sorensen, 2019) ANGIOSPERMS: MONOCOTYLEDON & DICOTYLEDON The angiosperms or flowering plants are divided into two groups: monocots and dicots. Monocots have one seed leaf while dicots have two. Monocots have leaves with parallel veins while netted veins for dicots. SEED BEARING PLANTS ANGIOSPERMS & GYMNOSPERMS Seed-bearing plants could be angiosperm or flowering or gymnosperm which are non-flowering plants. The angiosperms are plants that have flowers and produce seeds enclosed within a carpel. The angiosperms are a large group and include herbaceous plants, shrubs, grasses, and most trees. Their seeds may contain one seed leaf or monocotyledon and when there are two they are dicotyledons. The gymnosperms on the other hand are seed-producing plants known as "naked seeds" like cycads, conifers, and pines. The learning materials provided below will give you comprehensive information on the difference between angiosperms and gymnosperms. SEED BEARING PLANTS The other classification of plants is what we call seed-bearing plants or vascular plants. These plants reproduce through their seeds. Most fruits and vegetables that you love to eat are seed-bearing plants. Looking at the diagram below, seed-bearing plants could be gymnosperms or non-flowering plants and angiosperms or flowering plants. The angiosperms are classified too according to the number of seed leaves: monocotyledon and dicotyledon.
Gorillas Gorillas. Gorillas are members of the great ape family. They live in the forests of Africa. Gorillas have strong, heavy bodies. They can walk on two legs like people do. Most of the time they walk on their feet and hands. Gorillas eat leaves, stems, bark, fruits, flowers, and wood. They also eat insects and snails. Most gorillas do not hunt. Gorillas make faces to show how they feel. Their faces tell if they are happy, sad, or upset. Gorillas can cry, and they laugh when they are tickled. Gorilla Families. A gorilla family is called a troop. A troop eats, sleeps, and plays together. Family members play tag, catch, and dress-up with leaves. A gorilla baby nurses and stays close to its mother for a few years. It rides on her back to move around. When a male gorilla grows up, the fur on its back turns silver. It is called a silverback. The silverback's job is to protect the troop. Learning to Talk. Gorillas are very smart. A woman named Penny taught a gorilla to use sign language. The gorilla's name is Koko. Koko uses signs to tell Penny what she wants and how she feels. Gorillas in Danger. Many gorillas have been killed by hunters. Their forest homes are being cut down. Gorillas are now endangered. Many people are trying to save these great apes.
All living things are made up of one or more cells. A cell is the smallest unit that can carry on all of the processes of life. Beginning in the 17th century, curious naturalists were able to use microscopes to study objects too small to be seen with the unaided eye. Their studies led them to propose the cellular basis of life. Hooke In 1665, English scientist Robert Hooke studied nature by using an early light microscope, such as the one in Figure 4-1a. A light micro- scope is an instrument that uses optical lenses to magnify objects by bending light rays. Hooke looked at a thin slice of cork from the bark of a cork oak tree. âI could exceedingly plainly perceive it to be all perforated and porous,â Hooke wrote. He described âa great many little boxesâ that reminded him of the cubicles or âcellsâ where monks live. When Hooke focused his microscope on the cells of tree stems, roots, and ferns, he found that each had similar little boxes. The drawings that Hooke made of the cells he saw are shown in Figure 4-1b. The âlittle boxesâ that Hooke observed were the remains of dead plant cells, such as the cork cells shown in Figure 4-1c. SECTION 1 OBJECTIVES â Name the scientists who first observed living and nonliving cells. â Summarize the research that led to the development of the cell theory. â State the three principles of the cell theory. â Explain why the cell is considered to be the basic unit of life. VOCABULARY cell cell theory Robert Hooke used an early microscope (a) to see cells in thin slices of cork. His drawings of what he saw (b) indicate that he had clearly observed the remains of cork cells (300) (c). FIGURE 4-1 (a) (b) (c) Copyright Š by Holt, Rinehart and Winston. All rights reserved. 70 CHAPTER 4 Leeuwenhoek The first person to observe living cells was a Dutch trader named Anton van Leeuwenhoek. Leeuwenhoek made microscopes that were simple and tiny, but he ground lenses so precisely that the magnification was 10 times that of Hookeâs instruments. In 1673, Leeuwenhoek, shown in Figure 4-2a, was able to observe a previ- ously unseen world of microorganisms. He observed cells with green stripes from an alga of the genus Spirogyra, as shown in Figure 4-2b, and bell-shaped cells on stalks of a protist of the genus Vorticella, as shown in Figure 4-2c. Leeuwenhoek called these organisms animalcules. We now call them protists. THE CELL THEORY Although Hooke and Leeuwenhoek were the first to report observ- ing cells, the importance of this observation was not realized until about 150 years later. At this time, biologists began to organize information about cells into a unified understanding. In 1838, the German botanist Matthias Schleiden concluded that all plants were composed of cells. The next year, the German zoologist Theodor Schwann concluded the same thing for animals. And finally, in his study of human diseases, the German physician Rudolf Virchow (1821â1902) noted that all cells come from other cells. These three observations were combined to form a basic theory about the cel- lular nature of life. The cell theory has three essential parts, which are summarized in Table 4-1. Anton van Leeuwenhoek (1632â1723) is shown here with one of his hand-held lenses (a). Leeuwenhoek observed an alga of the genus Spirogyra (b) and a protist of the genus Vorticella (c). FIGURE 4-2 TABLE 4-1 The Cell Theory All living organisms are composed of one or more cells. Cells are the basic units of structure and function in an organism. Cells come only from the reproduction of existing cells. (a) (b) (c) www.scilinks.org Topic: Cell Theory Keyword: HM60241 mb06se_csfs01.qxd 5/18/07 10:54 AM Page 70
Land preparation â˘Carrots can be planted in beds. â˘The beds should be prepared before planting. (a)digging: this is done using a hoe or a spade so as to loosen the soil. â˘During digging , remove roots and stems of weeds. (b) manuring: add 2kg of well rotten manure per square metre. â˘Work the manure deeply into the soil so that the roots of the carrots do not come into directly contact with manure. â˘Improperly incorporated manure causes development of carrots that have side roots. â˘this condition is called forking. Planting â˘Carrots are planted in beds where they will mature. â˘Water the bed a day before planting. â˘Mark the rows 30cm apart. â˘Carrots seeds are very small, therefore due to their size sow the seeds thinly along the rows. â˘Rub the seeds between your fingers as you sow. â˘Cover the seeds with fine sand. â˘The bed can be covered with grass so that the soil remain moist. â˘Water the bed soon after sowing using a watering can fitted with a fine rose. Caring for carrots (a) Thinning: is when you remove some of the baby plants in a row to free up space for the rest so that they can grow to full size. ⢠Thinning in carrots is usually done two weeks after germination. ⢠Thin out to leave a spacing of 4 -6 cm from each plant. (b) Watering: If carrots are not watered enough they will not grow fast. ⢠Therefore carrots need a steady supply of water to keep the soil moist during the growing period. (c) Weeding: weeds are removed by hand, especially those in the rows. (d) Top dressing: carrots are usually not top dressed. â˘Fertilizer can only be applied after one has noticed leaves turning yellow. (e) Pest and disease control: aphids and nematodes attack carrots. â˘Dimethoate is used to control aphids. Harvesting carrots â˘Carrots are harvested 2 to 3 months after planting. â˘Bigger ones are harvested first inorder to leave more room for the young seedlings to develop. â˘Water the bed first the lift the carrots by hand. â˘A garden fork can also be used to loosen the soil, then pull up by hand. â˘The carrots can then be tied into bunches of 5 â 7 carrots