Biology

1.The drawing shows part of a chemical group whisker cubicle. (a) r come out of the closetine of goods and services words from the list to label the parts of the root hair carrell. carrel membrane carrell argue cytoplasm essence vacuole (4) (b)The diagram shows four ways in which molecules may kick the bucket into and out of a cell. The dots show the slow-wittedness of molecules. The cell is respiring aerobically. Which arrow, A, B, C or D represents: (i)movement of oxygen molecules;A (ii)movement of vitamin C dioxide molecules?B (2) (c)Name the process by which these gases move into and out of the cell. Diffusion (1) (Total 7 marks) 2.Some students set up the equipment below to analyse osmosis. (a)What is osmosis? A special case of diffusion that involves the movement of piddle supply molecules by a semi-permeable membrane. The water molecules move from a solution with a low solute concentration to a high-pitched solute concentrati on until thither is a balanced concentration of solute on both sides of the membrane. (3) (b)(i)What allow happen to the water level in the capillary furnish during the investigation because of osmosis? The water level in the capillary thermionic valve will rise because of osmosis, (1) (ii)Use your knowledge of osmosis to exempt wherefore this happens.

This happens because the capillary tube is more concentrated with common salt 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 class of a plant cell placed in distilled water. (i)Explain why the cell swells and becomes turgid. Nam! e the process involved. They swell because the cells will limiting in water by osmosis but when they have to a fault 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 made from cellulose which protects and stops the cell bursting. (1) (b)Describe the change which...If you want to get a safe essay, order it on our website: OrderEssay.net

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