CONTROL AND COORDINATION –5 Mark 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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