Control and Coordination

CONTROL AND COORDINATION

SHORT ANSWER TYPES QUESTION (SAQ)

1. Why is the use of iodised salt advisable? Answer : Iodine is needed to make the thyroxine hormone. Thyroxine is...

2. How does chemical coordination occur in plants? Answer : Plants use phytohormones, or plant hormones, for chemica...

3. Name the system which facilitates communication between central nervous system and the other parts of the body. Menti...

4. How does phototropism occur in plants? Answer : Phototropism is when plant parts move towards or away from light...

5. How does chemical coordination take place in animals? Answer : Chemical coordination in animals happens through...

6. Name the part of brain which is responsible for following actions: (i) Blood pressure (ii) Beating of heart (iii)...

7. Define tropism? What are different types of tropism? Answer : Tropism is when a plant part moves in a certain dir...

9. How do we detect the smell of an agarbatti (incense stick)? Answer : The smell of incense is detected by olfacto...

10. What is the function of receptors in our body? Think of situations where receptors do not work properly. What proble...

11. Name the hormones secreted by the following endocrine glands and specify one function of each: (i) Thyroid (ii) Pi...

12. What is the role of brain in reflex action? Answer : Reflex actions are mostly controlled by the spinal cord....

13. How does our body respond when adrenaline is secreted into the blood? Answer : Adrenaline is a hormone released...

14. What is the function of receptors in our body? Think of situation where receptors do not work properly. What problem...

15. How do auxins promote the growth of a tendril around a support? Answer : The tendril wrapping around a support...

16. What is chemotropism? Give one example. Name any two plant hormones and mention their functions. Answer : Chemot...

17. Nervous and hormonal systems together perform the function of control and coordination in human beings. Justify this...

18. (a) Explain how auxins help in bending of plant stem towards light. (b) State the objective of the experiment for w...

19. A cheetah, on seeing a prey moves towards him at a very high speed. What causes the movement of his muscles? How doe...

20. What is the need for a system of control and coordination in an organism? Answer : Multicellular organisms are...

21. Why is chemical communication better than electrical impulses as a means of communication between cells in a multice...

22. What do you mean by voluntary and involuntary actions? Categorise the following actions as voluntary or involuntary....

23. Name any three endocrine glands in human body and briefly write the function of each of them. Answer : Three end...

24. Name and explain the function of the hormone secreted by the pituitary gland in humans. Answer : Hormones secret...

25. What is feedback mechanism of Hormonic regulation. Take the example of insulin to explain this phenomenon. Answe...

26. What is autonomic nervous system? Which are the divisions of autonomic nervous system? Answer : The autonomic ne...

27. A squirrel is in a scary situation. Its body has to prepare for either fighting or running away. State the immediate...

28. Write one example each of the following tropic movements : (i) Positive phototropism (ii) Chemotropism (iii) Po...

29. (a) Explain any three directional movements in plants. (b) How brain and spinal cord are protected in human? (c) N...

30. Write the name and functions of any two parts of the human hind-brain. Answer : Any two parts of human hind-brai...

32.(a) Name the two main constituents of the Central Nervous System in human beings. (b) What is the need for a system o...

33. What is a reflex action? Describe the steps involved in a reflex action. Answer : Reflex action: It's an automat...

34. What are ‘nastic’ and ‘curvature’ movements? Give one example of each. Answer : i. Nastic movements: These are m...

35. (a) Define reflex arc. (b) Trace the sequence of events which occur in our body when a bright light is focussed on y...

36. What happens at the synapse between two neurons? Answer : A synapse is where the end of one nerve cell's axon c...

LONG ANSWER TYPES QUESTION (LAQ)

1. Draw the structure of a neuron and explain functions? Answer : Neuron or nerve cell is the structural and functio...

2. Following are the two examples of plant movement. One is dropping of leaves in touch me-not plant and second is attac...

3. How do control and coordination take place in plants? Answer : Plants have a special way of managing and organiz...

4. Draw a well-labelled diagram of a neuron. Name the part of a neuron: Answer : (i) Where information is acquired....

5. The figure given below represents certain phenomenon pertaining to the nervous system. (i) What does the figure repre...

6. Compare and contrast nervous and hormonal mechanisms for control and coordination in animals? Answer :...

7. Answers the following questions : (i) Why is the use ofiodised salt advisable? Name the disease caused due to defic...

8. What are the major parts of the brain? Mention the function of different parts? [picture] Answer : The brain is...

9. Nervous and hormonal systems together perform the functions of control and coordination in human beings. Justify the...

10. Explain the difference between nastic movements and tropic movements in plants? Answer :...

11. Describe the central nervous system in human beings. Answer : The central nervous system in human beings is hi...

12. The figure represents human brain. Study the figure given below and answer the following: (i) Name the parts labeled...

13. The brain directs our body's internal functions. It also integrates sensory impulses and information to form percept...

14. Define reflex action with suitable examples. Answer : When we quickly pull our hand away after being pricked b...

15. Nervous and hormonal system together perform the function of control and coordination in human beings. Justify the s...

16. Answer the following questions : Mention one function for each of these hormones: (i) Thyroxin (ii) Insulin (iii) Ad...

17. In the given diagram: (i) Name the parts labelled A, B, and C. (ii) Write the functions of A and C. (iii) Reflex a...

18. What is the difference between a reflex action and walking? Answer :...

19. Difference between cerebrum and cerebellum? Answer :...

NCERT SOLUTION

Page No. 119 1. What is the difference between a reflex action and walking?...

Page No. 119 1. What are plant hormones? Answer : Plant hormones are natural substances made in specific parts of...

Page No. 119 2. How is the movement of leaves of a sensitive plant different from the...

Page No. 119 3. Give an example of a plant hormone that promotes growth....

Page No. 125 1. How does chemical coordination take place in animals? A...

Page No. 126 1. Which of the following is a plant hormone? (a) Insulin (b) Thyroxi...

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

11. Compare and contrast nervous and hormonal mechanisms for control and coordination in animals. Answer :...

11. Compare Movement in sensitive plants and Movement in our legs. Answer : Movement in S...