Ws_Ch14_e

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Cells divide by (2) _______________ cell division. This leads to an increase in the (3) _______________ of cells. EMBED Word.Picture.8 Cells assimilate food substances and synthesize new materials. This leads to an increase in the (4) _______________ of cells. Development (Book 2, p. 14-3) Similar types of specialized cells group together to form tissues, organs and (9) _______________. This increases the complexity of the body organization. EMBED Word.Picture.8 ( Development increases the complexity of cells and complexity of body organization 14.2 Growth and development in plants (Book 2, p. 14-5) ASeed germination (Book 2, p. 14-5) Root hairs develop on the radicle to increase the (6) _______________ _______________ for water and mineral absorption. EMBED Word.Picture.8 Day 4 Young leaves develop to make food by (10) _______________. The cotyledons will fall off. Conditions necessary for seed germination ConditionReasonWaterWater softens the seed coat and makes cotyledons (11) ______________ to break the seed coat, so that the (12) _______________ can emerge. Water (13) _______________ enzymes in the seed, which help convert insoluble food reserves into simpler and soluble forms. Water acts as a (14) _______________ for the transport of soluble food.WarmthWarm environment allows the (15) _______________ in the seed to work efficiently.OxygenOxygen is needed in (16) _______________, which provides energy for the growth of the embryo. ( Go to Practical 14.1Design an investigation of the conditions for seed germination (Book 2, p. 14-6 Practical Workbook for SBA 2, p. 14-1) BWhere do growth and development take place in plants (Book 2, p. 14-7) Growth of the plants only occurs at the tips of the roots and shoots and the (17) _______________ of roots and stems. These regions contain (18) _______________. They are groups of (19) _______________ cells which are able to divide by mitotic cell division throughout the plants life. EMBED Word.Picture.8 ( The growing regions of a plant At the root tips and shoot tips The cells differentiate to perform specific functions. EMBED Word.Picture.8 At the periphery of roots and stems Secondary growth leads to the formation of annual rings in the woody stems. ( Go to Quick check(Book 2, p. 14-10) 14.3 Measurement of growth (Book 2, p. 14-11) ParameterAdvantageDisadvantageCommonly used forSize length, height, surface area and volumeAllow continuous measurement because the organism remains (1) ___________ ( Go to Practical 14.2Design an investigation of the growth of the main roots of young seedlings (Book 2, p. 14-13 Practical Workbook for SBA 2, p. 14-7) Quick check(Book 2, p. 14-13)14.4 Growth curves (Book 2, p. 14-14) The growth of an annual plant usually has three stages EMBED Word.Picture.8 ( Growth curve of an annual plant StageDescription1Dry mass (2) _______________ Stored food is broken down to provide energy for growth during the early stage of (3) _______________2Dry mass (4) _______________ Rate of (5) _______________ is faster than the rate of (6) _______________3Dry mass (7) _______________ (8) _______________ and (9) _______________ are dispersed BWhat are the stages of growth in humans (Book 2, p. 14-15) Growth in humans occurs in (10) _______________ parts of the body. During infancy, humans grow rapidly. Growth then slows down during childhood and becomes rapid again during (11) _____________. A person reaches the maximum size in (12) _______________. Growth becomes negative during the old stage. EMBED Word.Picture.8 ( Growth curve of humans Growth rates of different body parts Different body parts grow at different times and at different rates. The brain grows rapidly during infancy and early childhood while the reproductive organs grow rapidly at (13) _______________. ( Relative growth rates of different body partsThe relative sizes of different body parts change with age due to...
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