AY Honors/Palm Trees/Answer Key
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1. Give the general characteristics of the palm tree referring to the following parts:
a. Stem or trunk
A palm trunk are usually a straight, unbranched stem, though rarely the trunk will divide into two branches. Unlike other trees, palms add new growth to the inside of the stem. Other trees add new growth to the outside of the trunk, just under the bark. Thus, on a palm, the living wood is at the heart of the trunk and the old, dead wood is on the outside. In non-palms, the opposite is true.
b. Roots
Palms are monocots, belonging to the same family as grass and bamboo. As such, their roots do not gain much diameter once the plant reaches maturity. Roots of dicots, on the other hand (that is, broadleaf plants such as oaks and maples) continue to grow and get fatter as long as the plant lives. Thus, the roots of a dicot will destroy a sidewalk as it heaves up the concrete, while a palm will do no damage.
Palm roots are usually called "rootballs' because they form round structures. Rootballs will branch a bit but do not grow larger once the tree is mature.
c. Leaves
Palms have large evergreen leaves that are either palmately ('fan-leaved') or pinnately ('feather-leaved') compound and spirally arranged at the top of the stem. The leaves have a tubular sheath at the base that usually splits open on one side at maturity.
d. Inflorescence or flowers
The inflorescence is a panicle or spike surrounded by one or more bracts or spathes that become woody at maturity. The flowers are generally small and white, and radially symmetric. The sepals and petals usually number three each and may be distinct or joined at the base. The stamens generally number six, with filaments that may be separate, attached to each other, or attached to the pistil at the base.
e. Fruits
The fruit is usually a single-seeded drupe, but some genera (e.g. Salacca) may contain two or more seeds in each fruit.
2. a. What happens when the crown of a palm is cut out?
b. What happens when the trunk of a palm is damaged?
New growth comes from the crown, so if the crown is out out, the tree will die. The outer layers of a palm's trunk consists of dead tissue, and as such, it will not heal (just as your fingernails and hair do not "heal").
3. In the Pacific islands there are several species of palm trees which are helpful to man. Name two of these and list as many ways as you can how each helps man.
Sago Palm
Sago is a starch extracted from the pith inside stems of the sago palm Metroxylon sagu. Sago forms a major staple food for the lowland peoples of New Guinea and the Moluccas where it is called sagu and traditionally is cooked and eaten in the form of a pancake served with fish.
Sago looks like many other starches, and both sago and tapioca are produced commercially in the form of pearls. These two kinds of pearls are similar in appearance and may be used interchangeably in some dishes. This similarity causes some confusion in the names of dishes made with the pearls.
In addition to its use as a food source, the leaves and spathe of the sago palm are used for construction materials, for thatching roofs, and the fiber can be made into rope.
The starch is also used to treat fiber to make it easier to machine. This process is called sizing and helps to bind the fiber, give it a predictable slip for running on metal, standardize the level of hydration of the fiber, and give the textile more body. Most cloth and clothing has been sized and this leaves a residue which is removed in the first wash.
Coconut Palm
The coconut palm is grown throughout the tropical world, for decoration as well as for its many culinary and non-culinary uses; virtually every part of the coconut palm has some human uses.
Nearly all parts of the coconut palm are useful, and the palms have a comparatively high yield, up to 75 fruits per year; it therefore has significant economic value. The name for the coconut palm in Sanskrit is kalpa vriksha, which translates as "the tree which provides all the necessities of life". In Malay, the coconut is known as pokok seribu guna, "the tree of a thousand uses". In the Philippines, the coconut is commonly given the title "Tree of Life".[10] It its theorized that if you were to become stranded on a desert island populated by palm trees, you could survive purely on the tree and coconut alone, as the coconut provides all of the required natural properties for survival.
Uses of the various parts of the palm include:
Culinary
- The white, fleshy part of the seed is edible and used fresh or dried in cooking.
- Sport fruits are also harvested, primarily in the Philippines, where they are known as macapuno. They are sold in jars as "gelatinous mutant coconut" cut into balls or strands.
- The cavity is filled with coconut water which contains sugar, fiber, proteins, antioxidants, vitamins and minerals. Coconut water provides an isotonic electrolyte balance, and is a highly nutritious food source. It is used as a refreshing drink throughout the humid tropics and is also used in isotonic sports drinks. It can also be used to make the gelatinous dessert nata de coco. Mature fruits have significantly less liquid than young immature coconuts; barring spoilage, coconut water is sterile until opened.
- Coconut milk is made by processing grated coconut with hot water or milk, which extracts the oil and aromatic compounds. It should not be confused with the coconut water discussed above, and has a fat content of approximately 17%. When refrigerated and left to set, coconut cream will rise to the top and separate out the milk. The milk is used to produce virgin coconut oil by controlled heating and removing the oil fraction. Virgin coconut oil is found superior to the oil extracted from copra for cosmetic purposes.
- The leftover fibre from coconut milk production is used as livestock feed.
- The smell of coconuts comes from the 6-pentyloxan-2-one molecule, known as delta-decalactone in the food and fragrance industry.
- Apical buds of adult plants are edible and are known as "palm-cabbage" or heart-of-palm. It is considered a rare delicacy, as the act of harvesting the bud kills the palm. Hearts of palm are eaten in salads, sometimes called "millionaire's salad".
- Ruku Raa is an extract from the young bud, a very rare type of nectar collected and used as morning break drink in the islands of Maldives reputed for its energetic power keeping the "raamen" (nectar collector) healthy and fit even over 80 and 90 years old. And by-products are sweet honey-like syrup and creamy sugar for desserts.
- Newly germinated coconuts contain an edible fluff of marshmallow-like consistency called coconut sprout, produced as the endosperm nourishes the developing embryo.
- In the Philippines, rice is wrapped in coco leaves for cooking and subsequent storage - these packets are called puso.
Non-culinary
- Coconut water can be used as an intravenous fluid.
- Coir (the fiber from the husk of the coconut) is used in ropes, mats, brushes, caulking boats and as stuffing fibre; it is also used extensively in horticulture for making potting compost.
- Coconut oil can be rapidly processed and extracted as a fully organic product from fresh coconut flesh, and used in many ways including as a medicine and in cosmetics, or as a direct replacement for diesel fuel.
- Copra is the dried meat of the seed and, after further processing, is a source of low grade coconut oil.
- The leaves provide materials for baskets and roofing thatch.
- Palmwood comes from the trunk and is increasingly being used as an ecologically-sound substitute for endangered hardwoods. It has several applications, particularly in furniture and specialized construction (notably in Manila's Coconut Palace).
- Hawaiians hollowed the trunk to form drums, containers, or even small canoes.
- The husk and shells can be used for fuel and are a good source of charcoal.
- Dried half coconut shells with husks are used to buff floors. In the Philippines, it is known as "bunot", and in Jamaica it is simply called "coconut brush"
- In the Philippines, dried half shells are used as a music instrument in a folk dance called maglalatik, a traditional dance about the conflicts for coconut meat within the Spanish era
- Shirt buttons can be carved out of dried coconut shell. Coconut buttons are often used for Hawaiian Aloha shirts.
- The stiff leaflet midribs can be used to make cooking skewers, kindling arrows, or are bound into bundles, brooms and brushes.
- The roots are used as a dye, a mouthwash, and a medicine for dysentery. A frayed-out piece of root can also be used as a toothbrush.
- The leaves can be woven to create effective roofing materials, or reed mats.
- Fresh inner coconut husk can be rubbed on the lens of snorkeling goggles to prevent fogging during use.
- Dried coconut leaves can be burned to ash, which can be harvested for lime.
- Dried half coconut shells are used as the bodies of musical instruments, including the Chinese yehu and banhu, and the Vietnamese đàn gáo.
- Coconut is also commonly used as a herbal remedy in Pakistan to treat bites from rats.
- In World War II, coastwatcher scout Biuki Gasa was the first of two from the Solomon Islands to reach the shipwrecked, wounded, and exhausted crew of Motor Torpedo Boat PT-109 commanded by future U.S. president John F. Kennedy. Gasa suggested, for lack of paper, delivering by dugout canoe a message inscribed on a husked coconut shell. This coconut was later kept on the president's desk, and is now in the John F. Kennedy Library.
- Coconut trunks are used for building small bridges, preferred for their straightness, strength and salt resistance
4. Identify by sight six different types of palms which grow in your area. Do this in any language.
The best approach for meeting this requirement is to take a good field guide with you and start looking for palm trees. Once you find a palm tree, use the field guide to identify it. There are field guides specific to palm trees, but these tend to be rather expensive. However, a more general field guide to trees may have information on palms, and these are often less expensive books. You may also find a decent field guide at your local library.
5. Draw and name the six palm trees you have identified showing clearly the leaf formation, flowers and seed shape as well as the fruit.
If you have access to a camera, it is far easier to take several pictures of each specimen while you are out in the field. The pictures can then be drawn from the photos. Be sure to capture the leaves, flowers, seeds, and fruit so that you can reproduce them in your drawings.
You can also draw the pictures in the field.
6. Parts of palms are used for food or to help with the preparation of food. From your culture tell how a palm tree or part of it is used as food or in food preparation e.g. sago palm, coconut palm. Tell how to prepare it.
We refer you to Question 4 answers for example information on the Sago and Coconut Palms. Your culture may vary.
