File Name: a level biology past papers and answers .zip
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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 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 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 intensity increases 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 evaporation rolling of leaves v State the factors that cause increase in the rate of transpiration from leaves increased light intensity low relative humidity temperature vi Explain how drooping of leaves on a hot sunny 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 is perfectly balanced by absorption of more from the soil no special adaptations b. 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.
These include the internal workings of organisms in physiology and the interdependence of living things in ecology, to social issues including human influence on the environment and the ethical considerations of genetics. Build your own exam paper choosing from thousands of past paper questions. OER is a free interactive teaching and learning tool which includes exam answers and examiner comments. Grade boundaries are the minimum number of marks needed to achieve each grade. View Resources. Here you will find a collection of interactive units that bring together a number of elements including general data, exam questions, their marking schemes and examiner comments, which will lead you through a review of exam questions.
Lost in the pool of pdfs? Want Help? Click Here to get a complete guide on how to find your desired papers. × Hello, folks! The June papers for most of.
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The four units each take an overarching topic such as diversity or disease. These topics allow students to see links between concepts to bring the subject to life. Students must carry out 10 required practical activities in the course. The practicals are not constrained, allowing each school to choose resources and equipment that best suit their circumstances.
Specimen question papers are available for National 5, Higher and Advanced Higher qualifications. Exemplar question papers are available for Higher and Advanced Higher qualifications. Find them under 'Past Papers and Marking Instructions' on your subject pages. Braille question papers.
A great glossary of vocabulary that applies to Biology questions and answers. Question and markscheme. This is an outstanding synoptic question from a Pre-U Biology Paper. Question pdf and markscheme. All of which are on the specification. The OCR spec is now partly examined through some terrific multiple choice questions. This is a assessment format that is unusual to many students.
Home About My account Contact Us. Worked Examples guide learners through content in a step by step way, illustrating how to tackle complex problems. A Level Biology exam questions. Give your answer in micrometres and show your working. Tips throughout to help and remind students about exam technique, common errors and misunderstandings.
Cambridge International AS and A Level Biology builds on the skills acquired at Cambridge IGCSE (or equivalent) level. The syllabus includes the main.
The syllabus includes the main theoretical concepts which are fundamental to the subject, a section on some current applications of biology, and a strong emphasis on advanced practical skills. Hello everyone, Here are Chemistry A Level Paper 5 solved papers in which the answers are written in the full form as we are aware that the CIE marking schemes are sometimes hard to understand plus it does not contain the respective diagrams. Chemistry A Level Paper 5 P5 Solved Past Papers Hello everyone, Here are Chemistry A Level Paper 5 solved papers in which the answers are written in the full form as we are aware that the CIE marking schemes are sometimes hard to understand plus it does not contain the respective diagrams. Globular proteins are made of chains folded into a compact structure. Art and Design. Also, We have considerable Biology past papers collection as well.
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