Arihant - Class X - Control and Coordination [ Chapter - 7 ]Contact Number: 8527521718Arihant - Class X - Control and Coordination [ Chapter - 7 ]Contact Number: 8527521718What is the difference between a reflex action and walking?
What happens at the synapse between two neurons?
Which part of the brain maintains posture and equilibrium of the body?
Or
Mention the part of the brain, which maintains posture and equilibrium of the body.
How do we detect the smell of an agarbatti (incense stick)?
What is the role of brain in reflex action?
What are plant hormones?
How is the movement of leaves of sensitive plant different from the movement of a shoot towards light?
Give an example of a plant hormone that promotes growth.
How do auxins promote the growth of a tendril around a support?
Design an experiment to demonstrate hydrotropism.
How does chemical coordination take place in animals?
Why is it advised to use iodised salt in diet?
Or
Why is the use of iodised salt advisable?
How does our body respond when adrenaline is secreted into the blood?
Why are some patients of diabetes treated by giving injections of insulin?
Which of the following is a plant hormone?
1. Insulin
2. Oestrogen
3. Thyroxine
4. Cytokinin
The gap between two neurons is called as
1. dendrites
2. anon
3. synapse
4. impulse
The brain is responsible for
1. thinking
2. balancing the body
3. regulating
4. All of these
What is the function of receptors in our body?
Think of situations, where receptors do not work properly. What problems are likely to arise?
Draw the structure of a neuron and explain its function.
How does phototropism occur in plants?
Which signals will get disrupted in case of a spinal cord injury?
How does chemical coordination occur in plants?
What is the need for a system of control and coordination in an organism?
How are involuntary actions and reflex actions different from each other?
Compare and contrast nervous and hormonal mechanisms for control and coordination in animals.
What is the difference between the manner in which movement takes place in a sensitive plant and the movement in our legs?
All information about our environment is detected by specialised cells. Write the name given to such cells and also mention where are they located.
Name two tissues, which provide control and coordination in animals.
Name two components of central nervous system in humans.
Name the sensory receptors found in the nose and on the tongue.
Give some examples of involuntary actions.
Name any two types of tropic movements.
What do we call the movement of shoot towards light?
A young green plant receives sunlight from one direction only. What will happen to its shoot and roots?
Name one plant growth hormone, which retards growth during extremely dry season.
Name one plant hormone, which inlibits growth. Write its one more function.
Name the plant hormones responsible for the following.
(a) Elongation of cells
(b) Growth of stem
(c) Promotion of cell division
(d) Falling of senescent leaves
Why adrenaline is known as emergency hormone?
Which hormone is responsible for the secondary sexual characters in male human beings?
What are inhibitory hormones?
Identify the labelled parts A, B, C and D.
(i) Name the part of the brain, which controls
(a) voluntary actions
(b) involuntary actions
(ii) What is the significance of the peripheral nervous system? Name the components of this nervous system.
(i) If the cerebellum is not functioning properly, what activities of our body would get affected?
(ii) Which part of brain controls involuntary actions?
Name the main thinking part of the human brain. List any two major functions (other than thinking) of this part.
'Brain and spinal cord are two vital organs of our body'. How is our body designed to protect them?
Or
Our brain is known as the most delicate organ. How is it protected by our body? Explain.
Differentiate between the movement in plants and animals.
(i) State the function of the following plant hormones:
(a) Abscisic acid
(b) Cytokinin
(ii) Define chemotropism
Why pancreas is known as mixed gland?
Write the names of hormones released from pancreas.
Name the hormones responsible for
(i) development of moustache and beard in males.
(ii) controlling the uterus changes in menstrual cycle.
(iii) increasing blood glucose level.
(iv) maintaining water and electrolyte balance.
How does feedback mechanism regulate the hormone secretion?
Explain in brief why hormonal responses are slower than reflex actions.
Following graph shows the changes expected after a meal containing starch.
What inference can you draw from the graph shown?
In the figure A, B and C, which appears more accurate and why?
Trace the sequence of events, which occur in our body when a bright light is focussed on eyes.
Draw a nerve cell and label on it the following:
Nucleus, Dendrite, Axon
Classify the following into reflex action and in voluntary actions of brain.
(i) Beating of heart
(ii) Withdrawing your hand immediately on touching a hot object
(iii) Change in size of pupil in response to intensity of light
(iv) Riding a bicycle
(v) Sneezing
(vi) Pulling up the leg immediately when foot falls on some sharp object
Identify the unlabelled parts of brain in the given figure.
(i) What is reflex arc?
(ii) How do muscle cells move?
Explain how the movement of leaves of a sensitive plant different from movement of shoots towards light?
What are 'nastic' movements? Give one example of each.
(i) Identify the endocrine glands A, B, C and D in the given diagram.
(ii) List the functions of parts D and E.
Answer the following
(i) Name the endocrine gland associated with brain.
(ii) Which gland secretes digestive enzymes as well as hormones?
(iii) Name the endocrine gland associated with kidneys.
(iv) Which endocrine gland is present in males, but not in females?
If iodine is insufficient in one's diet, what might be the deficiency disease?
How it can be present?
Or
What will happen if intake of iodine in our diet is low?
Draw a diagram showing the correct positions of the pancreas, thyroid gland, pituitary gland and adrenal gland in human being.
Hormones are needed by our body in an appropriate amount, slightly more or less secretion causes disorders in our body. Illustrate this by using three examples.
What will happen, if the pancreas of a person stop functioning?
With the help of labelled diagram explain the general scheme to illustrate how nervous impulses travel in the body.
Draw a labelled diagram of human brain and mention the functions of the following: Medulla oblongata, cerebellum and forebrain.
What are the major parts of the brain? Mention the function of different parts.
'Plants also perform chemical coordination'. Elaborate.
Or
Name various plant hormones. Also give their physiological effects on plant growth and development.
Why do we call pituitary gland as the master gland? Where is it located and what are its functions?
Name the homrone, which is secreted by the adrenal gland. How does this homrone help to deal with scary situations.
(i) What are animals 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?
'Nervous and hormonal systems together perform the function of control and coordination in human beings.' Justify the statement.
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?
Some situations in our day to day life require quick response from our body. Illustrate the sentence with the help of suitable diagram and common examples.
Or
What are reflex actions? Give two examples. Explain a reflex arc.
Sunil met with an accident, while riding a bike. Patrolling police found him unconscious and took him to the hospital for treatment. After the accident, Sunil lost his memory completely and the left side of his body was paralysed.
Read the above passage and answer the following questions.
(i) Which injured body part can cause paralysis and memory loss?
(ii) What precautions should one take, while riding a two-wheeler?
(iii) What values were shown by police officers?
Naina along with her parents went to visit her aunt on a weekend. Her aunt has a very good aesthetic sense and she keeps her house beautifully decorated. She had kept few potted plants in the drawing room. Her aunt however, complained that the plant often bends toward one direction instead of growing straight. Her aunt asked Naina the reason behind it.
Read the above passage and answer the following questions:
(i) What can be the reason behind bending of the plants?
(ii) How can Naina's aunt keep the plants straight?
(iii) Do animals also show such movements?
(iv) What values are possessed by Naina's aunt?
Smita's father was complaining about frequent urination, pain in legs and a frequent weight loss to Smita's mother and she discussed the things with her daughter when Smita's mother returned from her school. Listening this, Smita said to her mother that her father should visit a doctor, who told her mother that her husband is having an elevated level of blood glucose. He should take care of his diet and should excercise regularly to maintain his normal glucose level
On the basis of given text, answer the following questions.
(i) Name the disease he is suffering from and name the hormone, whose deficiency causes it.
(ii) Identify the gland that secretes it and mention the function of this hormone.
(iii) Explain, how the time and amount of secretion of this hormone is regulated in human system.
(iv) What values were shown by Smita and her father?