Biology 0.0 / 5 ? BiologyCells, tissues and organsGCSEEdexcel Created by: feivellb._Created on: 15-11-20 09:01 Calculation for energy in food Energy in Food (J) = Mass of Water (in g) x Temp. change of water (°C) x 4.2 1 of 14 Calculation for energy per gram of food Energy per gram of food (J/kg) = Energy in food (J) ÷ Mass of food (g) 2 of 14 Variables that should be kept the same/constant when comparing different foods starting temp. of water, the temperature increase, distance of the flame from the boiling tube 3 of 14 What are the two types of cell division? Mitosis and Meiosis 4 of 14 Features of the cells in Mitosis? Genetically identical, Replicate, 2 daughter cells, 46 chromosomes (23 pairs) 2n, Diploid 5 of 14 Features of the cells in Meiosis? Genetically different, Reduction division, 4 new cells, Haploid 6 of 14 Reasons for cell division in Mitosis Growth, Repair, Asexual Reproduction 7 of 14 Reasons for cell division in Meiosis Production of Gametes and Sexual Reproduction 8 of 14 Location for Mitosis (Where it takes place) sites of repair/growth, stem cell, meristem 9 of 14 Location for Meiosis (Where it takes place) Testes and Ovaries 10 of 14 What is the function of the cornea? The cornea refracts(bends) light into the eye 11 of 14 What is the function of the iris? The iris controls how much light enters the pupil 12 of 14 What is the function of the lens? The lens refracts light, focusing it onto the retina 13 of 14 What is the function of the retina? The retina is the light sensitive part and it's covered in receptor cells called rods and cones, which detect light 14 of 14
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