Control and Coordination

Exercise 1

1.     Which of the following is a plant hormone?

(a) Insulin                                 (b) Thyroxin

(c) Oestrogen                           (d) Cytokinins

2.    The gap between two neuron is called a

(a) Dendrite                              (b) synapse

(c) axon                                      (d) impulse

3.     The brain is responsible for

(a) thinking                              (b) regulating the heart beat.

(c) balancing the body           (d) all of above.

4.     What is the function of receptors in our body? Think of situation where receptors do not work properly. What problems are likely to arise?

5.     Draw the structure of a neuron and explain its function.

6.     How phototropism does occur in plants?

7.     Which signals will get disrupted in case of a spinal cord injury?

8.    How does chemical coordination occurs in plants?

9.    What is the need for a system of control and coordination in an organism?

10.  How are involuntary actions and reflex actions different from each other?

11.   Compare and contrast nervous system and hormonal control and coordination in animals.

12.   What is the difference between the manner in which movement’s takes place in a sensitive plant and movement in our legs?

Exercise 2

13.   What is the difference between a reflex action and walking?

14.   What happens at the synapse between two neurons?

15.   Which part of the brain maintains posture and equilibrium of the body?

16.   How do we detect the smell of an agarbatti (incense stick)?

17.   What is the role of brain in reflex action?

Exercise 3

18.   What are plant hormones?

19.   How is the movement of leaves of the sensitive plant different from the movement of a shoot towards light?

20.  Give an example of a plant hormone that promote growth.

21.   How do auxins promote the growth of a tendril around a support?

22.   Design an experiment to demonstrate hydrotropism.

Exercise 4

23.   How does chemical coordination take place in animals?

24.   Why is the use of iodised salt advisable?

25.   How does our body respond when adrenaline is secreted into the blood?

26.   Why are some patients of diabetes treated by giving injections of insulin?