| Class | 10th |
| Subject | Science (NCERT) |
| Category | Important Questions |
Control and Coordination Class 10 Science Chapter 6 Important Question Answer
Q1. What is geotropism ? Give an example. Most Important
Ans – It is type of movement of plants in which the roots of a plant always grow downwards while the shoots usually grow upwards and away from the earth. example – downwards movement of roots.
Q2. Draw a well labelled diagram of a neuron. Most Important
Ans –
Q3. What happens at synapse between two neurons? Most Important
Ans – A synapse allows delivery of electrical impulses from neurons to other cells, such as muscles or gland.
Q4. What is reflex arc ? What is the function of sensory neuron in reflex arc ?
Ans – A reflex arc is a neural pathway that controls a reflex. In vertebrates, most sensory neurons do not pass directly into the brain, but synapse in the spinal cord. This allows for faster reflex actions to occur by activating spinal motor neurons without the delay of routing signals through the brain.
Q5. Draw a well labelled diagram of Reflex arch.
Ans –
Q6. What is the role of the brain in reflex action ?
Ans – The brain and spinal cord constitute the central nervous system. They receive information from all parts of the body and integrate it. The brain thus allows us to think and take actions based on that thinking. As you will expect, this is accomplished through a complex design, with different parts of the brain responsible for integrating different inputs and outputs. The brain has three such major parts or regions, namely the fore-brain, mid-brain and hind-brain.
Q7. What is the function of receptors in our body ? Write about two types of receptors.
Ans – All the information from our environment is detected by receptors.
example – (i) Gustatory receptors detect taste.
(ii) Olfactory receptors detect smell
Q8. What is peripheral nervous system?
Ans – The communication between the central nervous system and the other parts of the body is facilitated by the peripheral nervous system.
Q9. What are the various parts of peripheral nervous system? Write their functions.
Ans – The communication between the central nervous system and the other parts of the body is facilitated by the peripheral nervous system consisting of cranial nerves arising from the brain and spinal nerves arising from the spinal cord.
Q10. Write down the functions of cerebellum and medulla. Most Important
Ans –
| Cerebellum | Medulla |
| Controls voluntary actions | Controls involuntary actions |
| Actions like walking in a straight line, riding bicycle or picking up a pencil etc. | Actions including blood pressure, salivation and vomiting |
Q11. What is the effect of hormone Adrenalin ?
Ans – When Adrenaline hormone is secreted, the heart beats faster, resulting in more oxygen to our muscles. The breathing rate also increases which enables animal body to be ready to deal with the situation.
Q12. What are the functions of Abscisic acid?
Ans – Abscisic acid inhibits growth of a plant.
Q13. What is called peripheral nervous system? Write its different parts.
Ans – The communication between the central nervous system and the other parts of the body is facilitated by the peripheral nervous system. It has different parts as :-
(i) Cranial nerves arising from the brain.
(ii) Spinal nerves arising from the spinal cord.
Q14. What are the functions of cytokinins?
Ans – Cytokins promote cell division.
Q15. Why is the use of iodised salt advisable ? Write the functions of the hormone secreted by thyroid gland.
Ans – Iodine is necessary for the thyroid gland to make thyroxin hormone which regulates carbohydrate, protein and fat.
Q16. What are the functions of Gibberellin?
Ans – Gibberellin helps in the growth of stem.
Q17. What are the functions of forebrain?
Ans – The fore-brain is the main thinking part of the brain. Separate areas of the fore-brain are specilised for hearing, smell and sight.
Q18. What is the name of the gland secreting adrenaline hormone?
Ans – Adrenal gland.
Q19. Iodine is necessary for the synthesis of which hormone?
Ans – Thyroxin.
Q20. Name the hormone responsible for limiting the sugar level in blood in human beings.
Ans – Insulin.
Q21. Explain the process of response to touch in sensitive plant.
Ans – Leaves of the sensitive plant protect themselves from predators and environmental conditions by folding in response to touch. When we touch the leaves of these plants, they begin to fold up and droop.
Q22. How are brain and spinal cord protected in human body?
Ans – Our body is designed in such a way that the the brain sits inside a bony box. Inside the box, the brain is contained in a fluid-filled which provides further shock absorption. Spinal cord is protected by vertebral column or backbone which is a hard, bumpy structure.
Q23. Which gland secrete the growth hormone? What happens due to deficiency and excess of this hormone?
Ans – Pituitary gland secrete the growth hormone.
Deficiency of growth hormone leads to dwarfism, whereas, excess of growth hormone leads to gigantism/extremely tall.
Q24. Name the mechanism by which hormone secreted in precise quantity. Give an example.
Ans – Feedback mechanism
Q25. Which structure protects spinal cord ?
Ans – Vertebral column or backbone protects the spinal cord.
Q26. What are the various parts of central nervous system? Write their functions.
Ans – The central nervous system (CNS) consists of two main parts: the brain and the spinal cord. They receive information from all parts of the body and integrate it. The brain allow us think and take actions based on thinking. The spinal cord helps in reflex coordination and signal transmission.
Q27. What are the limitations to the use of electrical impulses ?
Ans – There are limitations to the use of electrical impulses. Firstly, they will reach only those cells that are connected by nervous tissue, not each and every cell in the animal body. Secondly, once an electrical impulse is generated in a cell and transmitted, the cell will take some time to reset its mechanisms before it can generate and transmit a new impulse. In other words, cells cannot continually create and transmit electrical impulses.
| Class 10 Science NCERT Solution | Click Here |
| Class 10 Model Papers [Latest] | Download Papers |
| Class 10 Old Question Papers | Download Papers |