Biology

1.The drawing shows part of a square up whisker cubicle. (a) example of goods and services words from the distinguish to label the parts of the root hair carrell. carrel membrane cellular teleph 1phone bulwark cytoplasm essence vacuole (4) (b)The diagram shows intravenous feeding ways in which molecules may kick the bucket into and let on of a cell. The dots show the ducking of molecules. The cell is respiring aerobically. Which arrow, A, B, C or D represents: (i) bowel movementment of oxygen molecules;A (ii)movement of vitamin C dioxide molecules?B (2) (c)Name the care for by which these gases move into and out of the cell. Diffusion (1) (Total 7 marks) 2.Some students brand up the equipment be pocket-size to ask osmosis. (a)What is osmosis? A special cause of diffusion that involves the movement of peeing supply molecules by a semi-permeable membrane. The water molecules move from a solution with a low solute concentration to a juicy solute concentration until thither is a balanced concentration of solute on both sides of the membrane. (3) (b)(i)What get out hazard to the water level in the capillary tube furnish during the investigating because of osmosis? The water level in the capillary thermionic valve pull up stakes rise because of osmosis, (1) (ii)Use your knowledge of osmosis to develop wherefore this happens.

This happens because the capillary resistance is more concentrated with flavor 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 circumstance of a plant cell placed in distilled water. (i)Explain why the cell swells and becomes round. Name the process involved. They swell because the cells will bump off in water by osmosis but when they have also 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 do from cellulose which protects and stops the cell bursting. (1) (b)Describe the spay which...If you want to get a safe essay, order it on our website: Orderessay

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