11-17 hw solutions (endocrine+homeostatis,plants,evolution).pdf

11-17 hw solutions (endocrine+homeostatis,plants,evolution).pdf

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© Gauteng Department of Education 1 SECONDARY SCHOOL IMPROVEMENT PROGRAMME (SSIP) 2015 GRADE 12 SUBJECT: LIFE SCIENCES LEARNER HOMEWORK SOLUTIONS (Page 1 of 15)
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© Gauteng Department of Education 2 SESSION NO: 11 QUESTION 1 : 1. Hormones 2. Pituitary gland / hypophysis 3. Pituitary gland / hypophysis 4. Endocrine 5. Goitre 6. Adrenal glands 7. Diabetes 8. Insulin 9. Nervous system 10. Adrenal glands 11. Reflex action 12. Thyroxin 13. TSH 14. Adrenalin 15. Negative feedback (15 x 1) (15) QUESTION 2: 2.1. a) 16:40 b) 09:00 (2) 2.2. a) 130 mg/10 cm 3 blood b) 98 mg/100 cm 3 blood (2) 2.3. a) 08:00 to 09:00 b) 16:00 to 17:00 (2) 2.4. a) 08:00 to 09:00 b) 15:00 to 16:00 (2) 2.5. After a meal rich in carbohydrates , digestion takes place and glucose is absorbed into the blood stream thereby increasing the blood sugar level. (4) 2.6. a) Insulin (1) b) Beta cells of the Islets of Langerhans in the pancreas (2) 2.7. a) glucagon (1) b) alpha cells of the Islets of Langerhans in the pancreas (2) c) Glucagon secretion is stimulated by a low blood sugar level Glucagon is transported to the liver by the blood It stimulates the conversion of glycogen to glucose Causing the blood sugar level to rise/increase (4) 2.8. a) will rise (1) b) adrenalin (1) c) adrenal medulla (1) d) Inhibits the action of the viscera in the stomach and the small intestine Constricts blood vessels to the skin (skin becomes pale) Increases the heartbeat rate and speeds up circulation Raises blood pressure (blood vessels are constricted)
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