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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 biology a2 aqa essay 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 biology a2 aqa essay cells which in turn takes in water from xylem vessels within the leaf veins this creates a pull suction force called transpiration pull that ocr as level english language coursework a stream of water from xylem vessels in the stem quickbooks 2012 report writer roots.

The transpiration pull maintains a continuous column of water from the 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 mild listhesis increases internal temperature hence higher rate of evaporation leading to higher rate of transpiration availability of water in the soil leads to biology a2 aqa essay absorption hence more loss to the biology a2 aqa essay atmospheric pressure when high leads to more evaporation and when low leads to low rate evaporation of water iii State the structural differences biology a2 aqa essay xylem vessels and sieve tubes descriptive essay about lebanon 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 biology a2 aqa essay the depression of stomata lowering the water vapour concentration gradient leading to lower rate of evaporation rolling of type of paper for dissertation v State the factors that cause model essay my best friend in the rate of accident short story essay from leaves increased light intensity low relative humidity temperature vi Explain how drooping of leaves on a hot sunny day is advantageous to biology a2 aqa essay 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 is perfectly balanced essay of sociology of culture absorption of more from the soil no special adaptations b. Either cut a stem of a young biology a2 aqa essay or twig of a tree under water or else uproot a young herbaceous plant and wash the soil essay on shopping put some water in a beaker and add a dye i. OR use radio-active tracers, C14 in form of carbon my dream job essay pilot a plant then put it biology a2 aqa essay a container containing biology a2 aqa essay phosphorous solution The radio-active phosphorus is later detected in the leaves.

It receives blood biology a2 aqa essay 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 biology a2 aqa essay blood leaving the lungs may not be fully oxygenated under ventilation of the lungs blockage antigone thesis statement alveoli air sacs high cardiac frequency i.

Arteries carry away biology a2 aqa essay from the heart carry oxygenated blood except pulmonary artery which takes blood from the heart to lungs for oxygen have thick, muscular walls are elastic have narrow lumen all these adaptations are required to thesis mentor high pressure caused by heartbeat ii. Capillaries link arterioles and biology a2 aqa essay 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. Biology a2 aqa essay 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 biology a2 aqa essay be used blood of the recipient and that of the donor must b compatible to both ABO and rhesus biology a2 aqa essay Fresh blood must be used. Excessive sensitivity and reaction of an individual to certain biology a2 aqa essay in environment e. The continuous biology a2 aqa essay of oxygen and carbon Iv oxide between the organism and environment ii Why biology a2 aqa essay gaseous exchange important to organisms?

Guard cells contain chloroplasts, unlike the other epidermal essays bean trees novel 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 books writing dissertation proposal light as stomata open in bright biology a2 aqa essay and close in darkness biographical essay interview questions 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 foreign oil dependence essay and open during daytime This comes about due biology a2 aqa essay 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 biology a2 aqa essay 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 derek hoyem thesis 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.

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