Biology

1.The drawing shows part of a rootle whisker cubicle. (a) handling of goods and services words from the careen to label the parts of the root hair carrell. carrel membrane cellular teleph nonpareilphone rampart cytoplasm essence vacuole (4) (b)The diagram shows four ways in which molecules may kick the bucket into and come forward of a cell. The dots show the tightfistedness of molecules. The cell is respiring aerobically. Which arrow, A, B, C or D represents: (i) unravelment of oxygen molecules;A (ii)movement of vitamin C dioxide molecules?B (2) (c)Name the sour by which these gases move into and out of the cell. Diffusion (1) (Total 7 marks) 2.Some students association up the equipment be low-spirited to check osmosis. (a)What is osmosis? A special theme of diffusion that involves the movement of urine supply molecules by a semi-permeable membrane. The water molecules move from a solution with a low solute concentration to a naughty solute concentration until thither is a balanced concentration of solute on both sides of the membrane. (3) (b)(i)What pass on run to the water level in the capillary tube furnish during the investigating because of osmosis? The water level in the capillary thermionic valve will rise because of osmosis, (1) (ii)Use your knowledge of osmosis to explicate wherefore this happens.

This happens because the capillary supply is more concentrated with salinity than the water surrounding so to balance the concentration, the water molecules will mobilise in to the capillary tube. (2) (Total 6 marks) 3.(a)The diagrams show what happens to the act upon of a plant cell placed in distilled water. (i)Explain why the cell swells and becomes erect. Name the process involved. They swell because the cells will take back in water by osmosis but when they have likewise much they become turgid because they have a cell wall to stop it from bursting. (2) (ii)Give one feature of the cell wall which allows the cell to become turgid. It is make from cellulose which protects and stops the cell bursting. (1) (b)Describe the modify which...If you want to get a safe essay, order it on our website: Ordercustompaper.com

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