CONTROL AND COORDINATION – 2020 Important Questions

1 MARK QUESTION

  Q1. Name two tissues, which provide control and coordination in animals.

  Q2. Name two components of the central nervous system in humans.                 

  Q3. Give some examples of involuntary actions.

  Q4. Give anyone function performed by our brain.

 Q5. Name any two types of tropic movements.

Q6. Name one plant growth hormone, which makes the seed dormant during extremely dry season.

Q7. Why adrenaline is known as emergency hormone?

Q8. What are inhibitory hormones?

Q9. Endocrine glands are called ductless glands. Why?

Q10. Define phototropism.

Q11. Give one example of chemotropism.

Q12. State the main functions of abscisic acid in plants.

Q13. Name two components of central nervous system in humans.

Q14. Name the largest cell present in the human body.

Q15. Mention the part of the brain which controls the involuntary actions like blood pressure, salivation etc.

Q16. Name the part of the neuron where information is acquired.

Q17. What is synapse?

Q18. Mention the part of the body where gustatory and olfactory receptors are located.

Q19. Define feedback mechanism of hormones.

Q20. Name the diseases by which a person is likely to suffer due to the deficiency of:

          (i)   Iodine

         (ii)  Insulin

Q21. We suddenly pull our and away on touching a pointed object. Name the type of response involved in this action.

Q22.’This plant hormone has its maximum concentration in fruits and seeds.’ Name the plant hormone.

Q23. Is reflex action the only function of spinal cord. Support your answer with a single statement.

Q24. The sensation of feeling fear or hunger is associated with which part of brain?

Q25. Name the source and target organ of adrenaline.

 Directions (Q. Nos. 26 – 30) In the following questions, a statement of Assertion is followed by a statement of Reason. Mark the correct choice as

(a) If both Assertion and Reason are true, and Reason is the correct explanation of Assertion

(b) If both Assertion and Reason are true, but Reason is not the correct explanation of Assertion

(c) If Assertion is true, but Reason is false

(d) If Reason is true, but Assertion is false

(e) If both Assertion and Reason are false

Q26. Assertion: Activities like walking in a straight line – riding a bicycle are possible due to cerebellum.

           Reason: Cerebellum is responsible for precision of the voluntary actions and maintaining the posture and balance of the body.

Q27. Assertion: When light comes from one side of a plant, the plant bends towards light.

            Reason: Auxin diffuses towards the shady side of the shoot and causes the cells to grow longer on that side of the shoot which Is away from light.

Q28. Assertion: The cerebrospinal fluid is found between the meninges.

             Reason: The cerebrospinal fluid protects the brain from external shocks.

Q29. Assertion: Thyroid Glands are called ductless glands.

             Reason: Thyroid glands are located at the place where they are required.

Q30. Assertion: Phototropism and Geotropism are two opposite kind of tropism.

            Reason: Geotropism is seen in roots and phototropism is seen in shoots.

Q31. Which one of the following is the main thinking part of the brain?

(a) Forebrain       

(b) Midbrain

(c) Hindbrain      

(d) Medulla

Q32. In response to nervous electrical impulses, the special proteins found in muscle cells change their

(a) shape                                           

(b) size

(c) arrangement in the cell                             

(d) Both (a) and (c)

Q33. Which of the following group of plant hormones help in the growth of the stem?

(a)  Auxins and cytokinins        

(b) Gibberellins and abscisic acid

(c)  Auxins and gibberellins     

(d)  None of the above

Q34. Which one of following hormones regulates carbohydrate, protein and fat metabolism in the body?

(a)  Insulin                         

(b) Thyroxine

(b) Growth hormone         

(d) Oestrogen

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?

5 MARKS QUESTIONS

Q1. Name various plant hormones. Also give their physiological effects on plant growth and development.      

Q2.  Why do we call pituitary gland as the master gland? Where is it located and what are its functions?

Q3.   (i)  What are animal hormones?  List their two characteristics.

           (ii)   Name the hormone,

(a) which brings change in male humans during the beginning of adolescence.

(b) which coordinates the level of sugar in blood?                           

Q4.   ‘Nervous and hormonal systems together perform the function of control and coordination in human beings.’ Justify the statement.            

Q5.  Why is the flow of signals in a synapse from axonal end of one neuron to dendritic end of another neuron, but not the reverse?            

Q6.   What are plant hormones? Give four different types of plant hormones and state their functions briefly.

Q7.   (a) Draw the structure of a neuron and label the following on it:

(i)   Dendrite

(ii)   Cell body

(iii) Nucleus

(iv) Axon

          (b) Name the parts of a neuron:

(i) Where information is acquired.

(ii) Through which information travels as an electrical impulse.

Q8.  Where this impulse must be converted into a chemical signal for onward transmission.

Q9.  Define neuromuscular junction.

Q10.  (a) What is the function of mind-brain?

             (b) Name the three different parts of hind brain and give one function of each.

Q11. (a) Name two hormones secreted by pancreas. Write one function of each hormone.

            (b) How does our body respond when adrenaline is secreted into the blood?

             (c) Cite an example to explain the feedback mechanism for regulation of hormonal secretion.

Q12. (a) Draw the structure of neuron and label cell body and axon.

            (b) Name the part of neuron:

                          (i)   Where the information is acquired.

                          (ii)  Through which information travels as an electrical impulse.

Q13.  With labelled diagram, describe an activity to show that gravity changes the direction of a plant part. Also, describe geotropism in simple words.

Q14. With the help of a labelled diagram, illustrate the pathway of response when someone pricks in your hand with a pin.

Q15. Nerves and hormones both are used to control processes within the body. Using examples, show how   nervous control and hormonal control

                    (i)   resemble and 

                   (ii)   differ from one another.

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