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Latest Marking Scheme - Free download as Excel Spreadsheet .xls /.xlsx), PDF File .pdf), Text File .txt) or view presentation slides online. fuck you this is fake marking scheme.  Latest Marking Scheme. Uploaded by. Yi Fan. 0 ratings0% found this document useful (0 votes). 1 views. 1 page. Document Information. click to expand document information. Description. WOODWORK. Сортировать: По умолчанию По наименованию Цена по возрастанию Цена по убыванию По Рейтингу По дате поступления.  Производитель:WOODWORK Артикул Наличие:Есть в наличии 38Наружный диаметр Посадка Толщина пропила Количество зубьев+ 10 р. + - В корзину. Подрезная алмазная пила WOODWORK D B/ d22 Z12+12 FZ Производитель:WOODWORK Артикул Наличие:Есть в наличии 47Наружный диаметр Посадка Толщина пропила Количество зубьев+ 10 р. + - В корзину. Зажим защелкивающийся GH, усилие кг Woodwork. Ask any top level woodworker which one area of their woodworking they could improve and the vast majority will say marking out. A few minutes and little care invested at the layout stage can save hours of frustration further down the line. The accuracy in your work has to originate from somewhere, so having good quality dependably accurate tools and instruments for laying out and checking your work is essential. Most of our marking and measuring tools also have the advantage of being lovely objects to own in their own right, so they make very good ideas for Christmas gifts and birthday present.

Attraction of water molecules to the Walls adhesion from the stem water enters the xylem of leaves water moves in the xylem vessels of the stem in a continuous uninterrupted water column up to the tree leaves Leaves once in the leaves water moves into the mesophyll cells by osmosis as water vaporizes from the spongy mesophyll cells their sap becomes more concentrated than the adjacent cells as the result water flows into the cell from other surrounding cells which in turn takes in water from xylem vessels within the leaf veins this creates a pull suction force called transpiration pull that pulls a stream of water from xylem vessels in the stem and roots.

The transpiration pull maintains a continuous column of water from woodwork 2018 marking scheme remove roots to the leaves. Absence of cuticle also increase rate of transpiration ii Explain the environmental factors that affect rate of transpiration in plants high temperature increases rate of transpiration and low temperature reduces the rate humidity when high increases rate and when low reduces the rate transpiration rate is higher in moving air wind than in still air high light intensity woodwork 2018 marking scheme remove internal temperature hence higher rate of evaporation leading to higher rate of transpiration availability of water in the soil leads to more absorption hence more loss to the atmosphere atmospheric pressure when high leads to more evaporation and when low leads to low rate evaporation of water iii State the structural differences between xylem vessels and sieve tubes sieve tubes have cross wall while xylem vessels have none xylem vessels are lignified while sieve tubes are not Sieve tubes have cytoplasm elements while xylem vessels have none.

Water vapour accumulates in the depression of stomata lowering the water vapour concentration gradient leading to lower rate of woodwork 2018 marking scheme remove rolling of leaves v State the factors that cause increase in the rate of transpiration from leaves increased woodwork 2018 marking scheme remove intensity low relative humidity temperature vi Explain how drooping of leaves on a hot woodwork 2018 marking scheme remove day is advantageous to a plant reduces surface area exposed to sun reducing cuticular transpiration c Explain how aquatic and terrestrial plants are adapted to deal with problems of transpiration a.

Mesophytes they grow in soils with enough water water loss woodwork 2018 marking scheme remove perfectly balanced by absorption of more from the soil no special adaptations woodwork 2018 marking scheme remove. Either cut a stem of a young plant or twig of a tree under water or else uproot a young herbaceous plant and wash the soil gently put some water in a beaker and add a dye i.

OR use radio-active tracers, C14 in form of carbon ring a plant then put it in a container containing radio-active phosphorous solution The radio-active phosphorus is later detected in the leaves. It receives blood from the whole body. For the heart muscle to be well nourished and be provided with enough oxygen and carbon IV oxide removal, it is supplied with blood by the coronary arteries and drained by the coronary veins iv Explain why blood leaving the lungs may not be fully oxygenated under ventilation of the lungs blockage of alveoli air sacs high cardiac frequency i.

Arteries carry away blood from Woodwork 2018 Marking Scheme Application the heart carry oxygenated blood except pulmonary artery which takes blood Junior Cert Woodwork Project Marking Scheme File from the heart to lungs for oxygen have thick, muscular walls are elastic have narrow lumen all these adaptations are required to withstand high pressure caused by heartbeat ii.

Capillaries link arterioles and venules to arteries and veins small in diameter to increase pressure resistance for materials to filter out thin walled as they consist of a single layer of cells to allow diffusion of substances e.

Give the advantages of this mode of transport. Introduction of blood from one person to another v Under what conditions would blood transfusion be necessary in people? State the precautions that must be taken before blood transfusion blood must be disease free sterilized equipment must be used blood of the recipient and that of the donor must b compatible to both ABO and rhesus factor Fresh blood must be used. Excessive sensitivity and reaction of an individual to certain substances in environment e.

The continuous exchange of oxygen and carbon Iv oxide between the organism and environment ii Why is gaseous exchange important to organisms? Guard cells contain chloroplasts, unlike the other epidermal cells which enable photosynthesis to occur Inner walls of guard cells are thicker than the outer cells iii State the factors which affect stomatal opening water which when low stomata close and when high stomata keeps open light as stomata open in bright light and close in darkness temperature iv Name the theories suggesting the mechanism of opening and closing of stomata interconversion of starch and sugar pH theory mineral ion concentration v Describe the mechanism of opening and closing of stomata stomata close at night and open during daytime This comes about due to changes in turgidity as a result of pH changes in guard cells.

During the day potassium ions concentrate in guard cells, raising their osmotic pressure and causes then to open In the night the concentration of potassium ions decreases increasing osmotic pressure in guard cells therefore causes stomata to open. Large surface area iii Describe gaseous exchange in protozoa example is amoeba small and have large surface area oxygen diffuses into the organism and carbon IV oxide diffuses out into Water simple diffusion of gases is enough to meet its respiratory requirements e i Make a labeled drawing of a fish gill ii How is a fish gill adapted to its function?

In the body tissues, carbon IV oxide diffuses into the blood due to concentration gradient, and is transported to the gills and diffuses out into the water.

Where water in which the fish lives flows in opposite direction across the gill. Any process which speeds up the rate of gaseous exchange between an animal and its surrounding. What is oxygen debt? Some energy locked up in intermediate woodwork 2018 marking scheme remove like ethanol in plants woodwork 2018 marking scheme remove lactic acid in animals substrate is completely oxidized in aerobic respiration iv Explain the disadvantages of anaerobic respiration Less energy produced in anaerobic respiration since food is partially oxidized while in aerobic respiration food is completely oxidized.

Nicotine got from leaves of woodwork 2018 marking scheme remove plant stimulates the central nervous, may cause addiction if much is used or consumed. It is used to make cigarettes, cigars and is poisonous.

It is a precursor of lung cancer Cannabis sative bhang is used to make drugs Gum derived from glues is used for sticking substances and making certain jellies Rubber, a product of latex, got from rubber plant is sued to make tyres and synthetic fibres Morphine from opium poppy plant is a narcotic and illegal drug as it causes addiction Khat and miraa are used as stimulants Colchicines used in inducing polyploidy, cancer therapy, treatment of gouts in small quantities Papain used as meat tenderizer c i Describe excretion in unicellular organisms -examples are amoeba and paramecium woodwork 2018 marking scheme remove have to remove waste products such as carbon IV oxide and nitrogenous substances e.

When it is cold, no sweat is produced, conserving water sweat contains water, sodium chloride, uric acid and urea hence the skin acts as an excretory organ Has hair. Arterioles vasodilate when temperatures are high to lose heat by radiation, and convention.

Arterioles constrict when temperatures are low to conserve heat i. Excretion in woodwork 2018 marking scheme remove function the liver is aided by the kidney deamination i.

Need specialized and complex transport system and also gaseous exchange system Explain why individuals with smaller sizes require more energy per unit body weight than those with larger sizes.

Adrenaline produced by adrenal glands in high concentrations, it increases hydrolysis of glycogen and increases blood sugar it is usually released in emergency cases to increase glucose level for respiration this releases energy for the emergency woodwork 2018 marking scheme remove i Distinguish between diabetes mellitus and diabetes insipidus diabetes mellitus is a condition resulting from insufficient production of insulin causing hyperglucaemia and presence of glucose in urine diabetes insipidus is a condition whereby less or no antidiuretic hormone is secreted hence a high volume of water is passed out in urine in a condition called diuresis ii How can high blood sugar level in a person be controlled?

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You can preview and edit on the next page. Describe how woodwork 2018 marking scheme remove amino acid forms a polypeptide. Not rated yet Describe how an amino acid forms a polypeptide. Q: Describe the structure of an amino acid and the formation of a peptide bond. Proteins are made … Click here to woodwork 2018 marking scheme remove your own.

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Award the higher mark if there is a good match with content and communication criteria. Award the lower mark if either content or communication barely meets the criteria. Marking rules All work should be seen to have been marked. Marking schemes will indicate when explicit working is deemed to be a necessary part of a correct answer. Mark schemes are prepared by the Lead Assessment Writer and considered, together with the relevant questions, by a panel of subject teachers. This mark scheme includes any amendments made at the standardisation events which all associates participate in and is the scheme which was used by them in this examination. kcse past papers marking schemes,kcse results , KCSE , KCSE, kcse papers with marking scheme, kcse maths paper 1, kcse mathematics paper 2 , kcse prediction questions and answers, kcse , kcse papers pdf, kcse chemistry past papers and answers, kcse mathematics prediction, kcse biology paper 1 , kcse mathematics questions and answers .




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