oceans‚ ponds‚ lakes and even puddles in the street to warm and evaporate. When water is heated‚ it changes from a liquid to a gas. This gas is called water vapor‚ and the process is called EVAPORATION. When plants give off water vapor‚ it’s called transpiration. When water evaporates‚ it rises into the cooler air‚ collects‚ and forms clouds. There‚ the water vapor molecules cool down and change back into liquid water. This is called CONDENSATION. As more and more water vapor cools into the clouds‚ the
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pressure decreases Coastal areas have a maritime climate: little ligt and seasonal variation Albedo: land of surface to reflect solar radiation; is influenced by vegetation type‚ soils and topography. Evapotranspiration: water loss through transpiration by plants‚ plus evaporation from the soil. Water is most dense at 4C. Ice has a lower density and forms on the surface. El Nino Southern Oscillation: longer-scale climate variations that occur every 3-8 years and last about 18 months. La
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w w w e tr .X m eP UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS GCE Advanced Subsidiary Level and GCE Advanced Level e ap .c rs om MARK SCHEME for the June 2004 question papers 9700 BIOLOGY 9700/01 9700/02 9700/03 9700/04 9700/05 9700/06 Paper 1 (Multiple Choice)‚ maximum raw mark 40 Paper 2 (Theory 1)‚ maximum raw mark 60 Paper 3 (Practical 1)‚ maximum raw mark 25 Paper 4 (Theory 2 (A2 Core))‚ maximum raw mark 60 Paper 5 (Practical 2 (A2))‚ maximum raw mark 30 Paper 6 (Options
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LEAFLETS ARE PRTESENT e.g. Melia azaderach AND Azadirachata indica) MODIFICATIONS IN THE LEAF:- * LEAF TENDRIL (LEAF OR ITS PART ARE MODIFIED INTO TEDRILS e.g. Lathyrous aphaca) * LEAF SPINE (MODIFIED INTO SPINE HELPING IN THE REDUCTION OF TRANSPIRATION e.g. Berberris lycidium . SOMETIMES TOP OF THE LEAF OR APEX MODIFIED INTO SPINES )
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and go in a hurry. The earth has a limited amount of water‚ that keeps going around and around and around and around and (you get the idea) in what is called the "Water Cycle". This cycle is made up of a few main parts: • evaporation (and transpiration) • condensation • precipitation • collection Evaporation: Evaporation is when the sun heats up water in rivers or lakes or the ocean and turns it into vapor or steam. The water vapor or steam leaves the river‚ lake or ocean and goes
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Seeds Stigma Guard Cells Phloem Xylem Root Hairs Root Cap Stomata Stamen Pistil Ovary Petals Sperm (pollen) Egg Sepal Filament Anther Style Vascular Guard Cells Flowers Leaves Stems Glucose Sunlight Roots Angiosperms Gymnosperms Oxygen Respiration Transpiration Reproduction Growth Water Carbon Dioxide Photosynthesis 5. One page essay (front and back) on each
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and continues to move down the water potential gradient until it reaches a pit. The water then moves through the pit and into the xylem vessel and up towards the leaves. The mechanisms ’in charge’ of the movement of water within the xylem is transpiration pull. This is where the water which is evaporating (as water vapour) through the stomata in the leaves is pulling the water at the bottom of the plant (roots and bottom of xylem) up towards the leaves. This is a passive process (as described above)
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and go in a hurry. The earth has a limited amount of water‚ that keeps going around and around and around and around and (you get the idea) in what is called the "Water Cycle". This cycle is made up of a few main parts: • evaporation (and transpiration) • condensation • precipitation • collection Evaporation: Evaporation is when the sun heats up water in rivers or lakes or the ocean and turns it into vapor or steam. The water vapor or steam leaves the river‚ lake or ocean and goes into
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(a) By sieving (b) By dissolving it in water (c) By iodine test (d) All of these Ans.) By iodine test 5) For the set up of which experiment is destarching of plant done? (a) (b) Photosynthesis (c) Ans.) Transpiration Respiration (d) Diffusion Photosynthesis 6) In which form is the excess of carbohydrates‚ the energy source‚ taken in food accumulated in our
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lower stomatal density than the outer leafs. This is known as an adaptation‚ (leaves in the centre of a shrub are exposed to small amounts of light meaning they have little of stoma because if they had many then they would lose lots of water (by transpiration). Leafs must grow the correct amount of stoma (for gas exchange/water loss) to the light levels in an area (even if they are shaded) this gives them a balance. Method: 1. Obtain two leaves from a shrub‚ (One from the centre and one from the
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