Class 12 Biology Chapter 17 Notes

• Important class 12 biology chapter 17 mcqs for Intermediate part-II students.
• What is innate behavior?
• What is the role of hypothalamus?
• What is habituation? Give an example.
• What is the role of vasopressin/ADH and oxytocin hormone?
• Important biology class 12 chapter 17 notes for Intermediate part-II students.
• What is the function of estrogen and progesterone?
• What is the commercial application of cytokinins?
•  What are sensory neurons?
• What are axons and dendrites?  OR  How axons differ from dendrites.
• Important chapter 17 biology class 12 notes pdf for Intermediate part-II students.
• What are the symptoms of Alzheimer’s disease?
• What is the difference between CNS and PNS?
• What is the function of parathyroid gland or parathormone?
• What is Parkinson’s disease?  OR  Differentiate between Parkinson’s and Epilepsy.
• Important chapter 17 class 12 biology notes for Intermediate part-II students.
• What are Nissl’s granules?  OR  What are neuroglia and Nissl’s granules?
• What are gastrin and secretin?  OR  Give the functions of secretin and gastrin.  OR  Name the two hormones of the gut.
• Write function of photoreceptors and nociceptors. 
• Compare Circadian and Circannual rhythms.
• Important class 12 biology chapter 17 notes pdf download for Intermediate part-II students.
• Define saltatory impulse. OR Define saltatory impulse and synapse.
• Define the term hormone, give one example?
• Differentiate between biorhythms and diurnal rhythms.
• Differentiate between etiolation and chlorosis.  OR  What is chlorosis?
• Differentiate between calluses and galls.
• Important class 12 chapter 17 biology notes for Intermediate part-II students.
• Differentiate between sympathetic and parasympathetic nervous system.
• Differentiate between active and resting membrane potential.
• Give role of 2, 4 Dichlorophenoxyacetic Acid.
• Give two commercial applications of Gibberellins.
• Important notes of chapter 17 biology class 12 for Intermediate part-II students.
•  Name and define different types of tropisms. 
• Give effects of nicotine on blood vascular system and digestive system in man. OR What is the action of nicotine on coordination?
• Explain the functions of two hormones secreted by Islets of Langerhans.  OR  What is the role of insulin and glucagon in the body?
• Important class 12 biology chapter 17 exercise solutions for Intermediate part-II students.

• What is the effect of nicotine on coordination?  Nicotine affects postsynaptic membrane in CNS and PNS. It minimizes the action of acetylcholine on nicotine receptors, so it is stimulant of nerve impulse. It increases the heart beat rate, blood pressure and digestive tract mobility, Nicotine may induce vomiting and diarrhea and even may cause water retention relation by kidneys.
• Important class 12 biology chapter 17 important questions for Intermediate part-II students.
• What are galls?  Galls are growths on a plant that are induced by parasites and usually,  highly organized growth galls are tumors induced by the bacteria. They are usually less differentiated the other types of galls.
• Important class 12 biology chapter 17 important questions and answers for Intermediate part-II students.
• What is nervous coordination?  This type of coordination involves specialized cells or neurons linked together directly or via the central nervous system, to form network that connect the cell or organs which receive stimuli (receptors) and those which carry out  actions or responses (effectors).
• Important class 12 biology chapter 17 questions and answers for Intermediate part-II students.
• What is reflex arc? Reflex arc is the path way of passage of impulse during a reflex action.  Reflex action is a type of involuntary action. The direction of stimulus is form receptors to sensory neurons to associative neuron and then through motor neuron to the effectors.
• Important class 12 biology chapter 17 short questions for Intermediate part-II students.
• What are Motor Neurons?  These are the neurons which carry nerve impulses from brain and spinal  cord to the effectors in all parts of the body. They have a long axon and number of  small dendrites.
• Important class 12 biology chapter 17 important short questions for Intermediate part-II students.
• What are Associative Neurons?  These are the neurons which occur exclusively in the spinal cord and brain.  They serve as intermediate links between numerous sensory and motor neurons.
• Important 12 class biology 17 chapter notes for Intermediate part-II students.
• What are Effectors?  These are the structures which respond when they are stimulated by impulse coming via motor neuron. The principal effectors are glands, which respond by secreting; and muscles which respond by contracting.
• Important chapter 17 Biology class 12 short questions for Intermediate part-II students.
• Define learning behavior?  Thrope defined learning as that process which manifests itself by adaptive changes in individual behavior as a result of experience.
• Important 12 class biology chapter 17 notes for Intermediate part-II students.