CONTROL AND COORDINATION –3 Mark Questions

Q1.         Name the main thinking part of the human brain.  List any two major functions (other than thinking) of this part.

Q2.   Differentiate between the movement in plants and animals.

Q3.   There is a close coordination between nerves and hormones. Explain in brief.

Q4.    Midbrain connects the forebrain and hindbrain.  Write its role in CNS.

Q5.  ‘Tropism is directional whereas nastic movement is non-directional. Justify this statement.     

Q6.   Explain in brief why hormonal responses are slower than reflex actions.

Q7.   What are the functions of the relay, motor and sensory neurons in a reflex response?

Q8.  Why pancreas is known as mixed gland? Write the names of hormones released from pancreas.

Q9. What is geotropism? Draw a labelled diagram of a potted plant showing positive geotropism and negative geotropism.

Q10. Define positive geotropism and negative geotropism. Give one example of each.

Q11. Give one example of following plants:

                (a)  Which is

                     (i)    positively phototropic and

                      (ii) negatively geotropic.

                (b) Which is positively hydrotropic as well as positively geotropic?

                (c) Which synthesises auxin?

Q12. Name the plant hormone that promotes growth. How do these hormones bring about phototropism in the shoots of a plant?

Q13. Illustrate with the help of a diagram, the effect of auxins in different parts of a plant.

Q14. How do auxins help in bending of stem towards light? Explain.  

Q15. Draw a neat diagram of human brain and label on it the following parts:

(i)   Mid brain

(ii)  Pituitary gland

(iii) Cerebellum

(iv) Cerebrum

Q16. Define reflex action. Give one example. Show with the help of a flow diagram the path of the reflex action.

Q17. Write three main functions of the nervous system.

Q18. Name a hormone secreted by:

(i)   Pancreas

(ii)  Pituitary

(iii) Thyroid

Q19.  State one function of each of the hormones.

Q20.   (a) An old man is advised by his doctor to take less sugar in his diet.  Name the disease from which the man is suffering. Mention the hormone due to imbalance of which he is suffering from this disease.  Which endocrine gland secretes this hormone?

              (b) Name the endocrine gland which secretes growth hormone. What will be the effect of the following on a person:

(i)    Deficiency of growth hormone.

(ii)   Excess secretion of growth hormone.

Q21.  (i)  Name the hormone secreted by thyroid gland and state its function.

             (ii) Why is it important for us to have iodised salt in our diet?

             (iii) Name the disease caused due to deficiency of iodine and mention its main symptom.

Q22. Mention one role of each of the following:

(i)    Cerebellum

(ii)   Fore-brain

(iii)  Medulla.

Q23.  ‘Brain and   Spinal cord are two vital organs of our body’. How is our body designed to protect them?

Q24. Name the hormones secreted by the following endocrine glands and mention one function of each.

(a) Thyroid   (b) Pituitary

Q25.  Auxins promote the growth of a tendril around a support. How?

Q26.   (a) Name the hormone which provides wide-range changes in human body and which gland secretes this hormone?

              (b) Give a detailed account of the functioning of the above stated hormone.

Q27. What are receptors with reference to nervous system?  List three types of receptors and mention their functions. How do receptors pass the information to brain?

Q28. A plant in the laboratory is given increased dose of a hormone, which promotes the development of seedless fruits.  Identify the hormone and write its other two functions.

Q29.  Adrenal glands are located on top of each kidney. What will happen if these glands do not secrete adrenaline?

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