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  10th Science : Plant and Animal Hormones Important Questions Choose the correct answer Q1. Identify the exocrine gland a) Pituitary gland b) Adrenal gland c) Salivary gland d) Thyroid gland Q2. Which one is referred as “Master Gland”? a) Pineal gland b) Pituitary gland c) Thyroid gland d) Adrenal gland Q3. Which organ acts as both exocrine gland as well as endocrine gland a) Pancreas b) Kidney   c) Liver   d) Lungs Q4.Diabetes insipidus is caused by reduced activity in a) Thyroid b) Anterior lobe of pituitary c) Intermediate pituitary lobe d) Posterior lobe of pituitary Q5. Table salt is often iodized for certain areas to prevent a) Scurvy b) Goitre c) Acromegaly d) Rickets Q6. Ovulation in mammals is caused by a) FSH and TSH b) FSH and LH c) FSH and LTH d) LTH and LH Fill in the blanks Q7. _______ causes cell elongation, apical dominance and prevents abscission. Q8. _________ causes stomatal closure. Q9. Calcium metabolism of the body is controlled by ___________. Q10. ...

  Important question answer (Chapter Revision)   Q1. A man climbs a slope and another walks the same distance on a level road. Who does more work and why ? Answer: The man who walk on a level road does no work as he is walking at right angle to the direction of gravitational force. Hence the man climbs a slope is doing more work. Q2. State the CGS and SI units of work. Answer : CGS unit of work is erg or gcm2s2 S.I. unit of work is joule or kgm2s2 1 J = 107 ergs or 1 erg = 10-7 g Q3. What is horsepower ? What is its magnitude in SI unit ? Answer : Horse power is unit of power used in engineering 1 H.P = 746 w.  Q4. Prove mathematically the law of conservation of energy. Answer : Law of conservation of energy : “Energy can neither be created nor destroyed. Though it can be transformed from one form to other.” At A Consider a body of mass m at A at a height h above the ground level. P.E. = mgh K.E. = 0 at rest. P.E. + K.E. = mgh + O = mgh …………….. (i) Let it fall from A ...

  Important Question Answer (Chapter Revision); Ready to Test your knowledge Q1. Why does the electric fan continue to rotate for sometime after the current is switched off.?  Ans. The fan continues to rotate due to inertia of motion, until the friction in bearings and that of air brings it to rest.  Q2. Is a train moving on a circular track, an inertial frame of reference.?  Ans. No Q3. A trolley of mass 300kg carrying a sand bag of 25kg is moving at a uniform speed of 27km/h on a smooth track. After a while, sand begins to leak out of a hole on the trolleys floor at a rate of 0.05kg/s. What is the speed of the trolley after the entire sand bag is empty.?  Ans. As the trolley is moving uniformly on a smooth track, no external forces acts on the trolley bag system. Hence its speed will remain 27km/h even after the bag become empty through leakage of sand.  Q4. A Bob of mass 0.1kg hung from the ceiling of a room by a string 2m long is set into oscillation. T...