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Download Q. Describe an activity to demonstrate phototropism. A. Fill a conical
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Q. Describe an activity to demonstrate phototropism. A. Fill a conical flask with water. Cover the neck of the flask with a wire mesh. Keep two or three freshly germinated bean seeds on the wire mesh. Take a cardboard box that is open from one side. keep the flask in the box in such a manner that the one side of the box faces light coming from a window. After two or three days, we will find that the shoots bend towards the light and roots away from the light. Now turn the flask so that the shoots are away from light and the roots towards light. Leave it undisturbed in this condition for a few days. After few days, we will again find that the shoots bend towards the light and roots away from the light. Thus, this demonstrates that shoots are positively phototropic and roots are negatively phototropic. Q. Describe an experiment to demonstrate hydrotropism. A. Take a potted plant with tiny seedling. Water the right part of the pot carefully so that the soil on the left side remains dry. Repeat the above process for 4 to 5 days. Now dig up the seedlings carefully from the pot without damaging its roots. OBSERVATION:- The roots of seedlings found to be bent towards right. CONCLUSION:- Roots are positively hydrotropic. ENDOCRINE GLANDS AND THEIR FUNCTIONS GLAND HYPOTHALMUS PITUITARY THYROID PARATHYROID THYMUS ADRENAL PANCREAS TESTIS [ Only in males ] OVARIES [ Only in females ] LOCATION BRAIN AT THE BASE OF BRAIN NECK HORMONE FUNCTION RELEASING HORMONE GROWTH HORMONE Stimulates pituitary to secrete hormones THROXINE Regulates carbohydrates and fat metabolism Controls metabolism of calcium and phosphorus Regulates production of antibodies NEAR THYROID GLAND NEAR HEART PARATHORMONE JUST ABOVE KIDNEYS NEAR STOMACH ADRENALIN THYMOSIN Regulates growth of bones a) INSULIN Controls heart beat, respiration, blood pressure etc. It decreases blood sugar level b) GLUCAGON It increases blood sugar level IN SCROTUM ABOVE ABDOMEN CAVITY TESTOSTERONE a) Regulates production of sperm cells LOWER ABDOMEN a) OESTROGEN b) Controls male secondary sexual characters like growth of beard and moustache etc. a) Regulates production of ovum b) Controls female secondary sexual characters such as hair pattern, voice etc. Stops egg production, attaches foetus to b) PROGESTRONE uterine wall
