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(inside, diseases, solution, exists, underground, moisture, aboveground, main, certain, damage)
How Trees Breathe Acting as an enormous "carbon sink", trees soak up ____ (углекислый газ) from the air, producing life-giving ____ (кислород) in return. In fact, a medium-sized tree generates the same ____ (количество) of oxygen as each one of us needs to breathe. In a tree, 'breathing' ____ (происходить) in the ____ (лист). Chlorophyll (the substance causing the green colour) absorbs the CO2 and uses it along with water to dissolve minerals taken up through the ____ (корни). After the chemical reaction is completed, the leaf releases oxygen and water vapor through its ____ (поры). How Trees Drink There are two ways that a tree can take in water: ____ (через) the leaves and through the roots. Trees absorb small amounts of ____ (влага) from the air through their leaves and their ____ (кора). Most of their water, however, comes via the roots. Water enters the roots through thin membranes at their ____ (кончики). The tree’s ____ ____ (васкулярная система) draws the water up through the ____ (ствол) and distributes it to the leaves. The leaves use the water to ____ (растворять) minerals. Excess water goes back to the air through pores in the leaf - a process called ____ (транспирация).
– What tree has a very thin bark? Text A Structure of a Tree The tree is composed of an underground part, the roots, and two aboveground parts, the trunk (bole) and the crown. Leaves The leaves convert carbon dioxide into oxygen and provide the tree with energy to grow and fight diseases. Leaves perform two vital functions for trees. They produce sugars by photosynthesis and they allow for the distribution of water through transpiration. Photosynthesis is a process by which CO2 and water are combined with sunlight and a pigment called chlorophyll. The chemical reactions result in the production of sugars which provide energy to the tree. The leaves use some of this energy, but the majority is transported, in the form of sugar solutions, to other parts of the tree that require it. Transpiration, or water loss, also takes place in the leaves. As this occurs, water is drawn up from the roots through the vascular system to replace lost moisture. Roots Roots are organs that provide structural stability for trees. Roots also absorb water and minerals. Root Structure Roots are made up of a number of specialized components. The root hairs, tiny structures extending from the main root stems, have very thin walls which absorb water and minerals. This mineral solution is passed into the vascular core of the root from where it is transported throughout the tree. At the tip of the root, there exists a protective structure called the root cap. These loose cells are shed as the root grows into the soil. Different trees have slightly different root systems. Some trees, such as the pine, have a strong central root called the taproot. This is usually larger than any other roots and often extends deep into the ground. Because substantial damage to this root can be fatal to the tree, trees with taproots are generally difficult to transplant. Other trees, such as the elm or maple, do not have a dominant taproot. Their root systems are characterized by a large number of roots often closer to the surface. The Bark The bark is the outer protective covering of tree trunks. The form and structure of the bark can differ greatly from tree to tree. As a result, it is a useful characteristic for tree identification. The bark is made up of two layers - outer bark and inner bark. The outer bark is made up of dead cells. This layer is usually quite thick, but in certain trees (young birch, for example) it is very thin. The inner bark, known as the phloem is made up of a thin layer of living cells. These cells have extremely thin walls allowing water and nutrients (in the form of sugar solutions) to pass easily throughout the tree. Somewhat akin to human skin, old bark is shed, and new bark is formed from the inside.
жизненно важные функции; посредством транспирации; пигмент, называемый хлорофиллом; производство сахаров; восполнить утерянную влагу; крошечные структуры; раствор минералов; защитная структура; главный корень; защитное покрытие; тонкий слой живых клеток; изнутри
– The tree consists of three main parts. – A process by which CO2 and water are combined with sunlight and chlorophyll is called photosynthesis. – Water loss occurs in the leaves. – One of the functions of roots is to absorb water and minerals. – The root hairs have very thin walls. – Root structures of different trees can differ. – Root systems of some trees have a large number of roots often closer to the surface. – The outer protective covering of tree trunks is called the bark. – The cells of the phloem have extremely thin walls. – Bark is somewhat akin to human skin.
chlorophyll.
The text reports on… The text touches upon… It is reported that… Much attention is given to… The text points out that… The text deals with the problem of… The text provides information on… The text defines the phenomenon of… The text covers such points as…
– Important Facts about Trees – Ring-porous and Diffuse-porous Trees – Wild-type Trees Words and expressions: wild – дикий spread – распределять dissimilar – непохожий evenly – равномерно distinction – различие affect – влиять, поражать treat – обрабатывать, лечить susceptibility – восприимчивость ring – кольцо wilt – увядание porous – пористый vessel – сосуд sapwood – заболонь (наружные молодые, refer (to) – относиться (к) физиологически активные слои древесины) Text B Some trees are wild, others are cloned. It's easy to think that all trees of a species are alike. This is only true, however, of certain species. Most trees are wild-type trees, meaning that their genetic structures are as dissimilar as individual humans. An example of a wild-type is an elm. Other trees have been cloned to produce many trees with identical genes. This is usually done to guarantee the presence of certain favourable characteristics of the tree. Examples include apple and pear trees. This distinction is important when treating diseases. In a wild-type tree, each tree will react differently. Trees can be divided into ring-porous or diffuse-porous types. This refers to the structure of the vascular system. The vascular system of diffuse-porous trees (such as a birch) is characterized by vessels spread evenly throughout the sapwood. These vessels are produced regularly during the growing season. The vessels of a ring-porous tree (such as an elm) are generally larger and concentrated in the outermost layer of sapwood. These vessels are produced early in the season. This is significant because it affects a tree's susceptibility to vascular wilt diseases.
A cloned B low C young D wild
A identical leaves B identical genes C identical flowers D identical crowns
A ring-porous or diffuse-porous B deciduous or coniferous C annuals or perennials D creepers and climbers
A late in the season B in two seasons C in the middle of the season D early in the season
Text C Trees In botany, a tree is a perennial plant with an elongated stem, or trunk, supporting leaves or branches. In some usages, the definition of a tree may be narrower, including only woody plants, only plants that are usable as timber or only plants above a specified height. At its broadest, trees include the taller palms, the tree ferns, bananas and bamboo. A tree typically has many secondary branches supported by the trunk. This trunk typically contains woody tissue for strength, and vascular tissue to carry materials from one part of the tree to another. For most trees it is surrounded by a layer of bark which serves as a protective barrier. Below the ground, the roots branch and spread out widely; they serve to anchor the tree and extract moisture and nutrients from the soil. Above ground, the branches divide into smaller branches and shoots. The shoots typically bear leaves, which capture light energy and convert it into chemical energy by photosynthesis, providing the food needed by the tree for its growth and development. Flowers and fruit may also be present, but some trees such as conifers instead have pollen cones and seed cones, and others such as tree ferns produce spores. Trees tend to be long-lived, some reaching several thousand years old. The tallest known specimen on Earth is 115.6 m and they have a theoretical maximum height of 130 m. Trees have been in existence on the Earth for 370 million years. Trees are not a taxonomic group but are a number of plant species that have independently evolved a woody trunk and branches as a way to tower above other plants and make full use of the sunlight. Trees play a significant role in reducing erosion and moderating the climate. They remove carbon dioxide from the atmosphere and store large quantities of carbon in their tissues. Trees and forests provide a habitat for many species of animals and plants. Tropical rainforests are one of the most bio-diverse habitats in the world. Trees provide shade and shelter, timber for construction, fuel for cooking and heating, and fruit for food as well as having many other uses. Socializing Profession I. Listen, read and memorize:
Обратите внимание! В предложениях, в которых говорится о профессии или о роде занятий человека, употребляется неопределенный артикль. Например: He is a businessman. I am a student. II. Listen, memorize and act out:
Practice
Henry ____, he works ____. Olya ____, she works ____. I ____, I study ____. My friends are also ____, they ____ at the university. Joe ____ in a bank, he ____. These are his ____, they also ____ in a bank. She is not ____, she is ____. He is not ____, he is ____.
Example: Are you a teacher? – Yes, I am. No, I am not. I am an economist.
Is Helen a secretary? Is Robert a driver? Are you a businessman? Do they work? Do you work or study?
No, it is not. It’s a school. Is this a firm? Is this a bank? Is this a store? Is this a factory? Is this a post-office?
Unit IV Garden Grammar for Revision: The Participle Text A : Garden Text B: Ornamental Gardens Text C : Types of Gardens Socializing: Nationality “The best place to seek God is in a garden”. George Bernard Shaw “There is always music amongst the trees in the Garden, but our hearts must be very quiet to hear it”. Minnie Aumonier Warm up What do you know about garden and gardening? Take this Garden Quiz. Match the questions to the answers:
Grammar Revision The Participle Forms and Functions
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