Biology

1.The drawing shows part of a radix whisker cubicle. (a) rehearse of goods and services words from the list to label the parts of the root hair carrell. carrel membrane electric cell skirt cytoplasm essence vacuole (4) (b)The diagram shows four ways in which molecules may kick the bucket into and by of a cell. The dots show the concentration 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 suss out osmosis. (a)What is osmosis? A special case of diffusion that involves the movement of water system supply molecules by a semi-permeable membrane. The water molecules move from a solution with a low solute concentration to a exalted solute concentration until thither is a ba lanced concentration of solute on both sides of the membrane. (3) (b)(i)What pass on 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 beg off wherefore this happens.

This happens because the capillary tube is more concentrated with 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 spirt of a plant cell placed in distilled water. (i)Explain why the cell swells and bec omes turgid. Name the process involved. The! y swell because the cells will ask in water by osmosis but when they have as well 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 form which...If you want to get a safe essay, order it on our website: OrderEssay.net

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