CBSE Class 10 Science Control And Coordination Worksheet

MCQ Questions for NCERT Class 10 Science Control and Coordination

Question. Abscisic acid controls
(a) cell elongation and cell wall formation
(b) shoot elongation
(c) cell division
(d) leaf fall and dormancy
Answer: D

Question. Which part of nervous system controls the re¬flex activities of the body?
(a) Brain
(b) Spinal cord
(c) Cerebrum
(d) Cerebellum
Answer: B

Question. Which of the following acts as both endocrine and exocrine glands?
(a) Adrenal
(b) Pituitary
(c) Ovaries
(d) Pancreas
Answer: D

Question. Which of the following is a plant hormone?
(a) Insulin
(b) Thyroxin
(c) Oestrogen
(d) Cytokinin
Answer: D

Question. The gap between two neurons is called a
(a) dendrite.
(b) synapse.
(c) axon.
(d) impulse.
Answer: B

Question. The brain is responsible for
(a) thinking.
(b) regulating the heart beat.
(c) balancing the body.
(d) all of the above.
Answer: D

Question. Which plant hormone promotes dormancy in seeds and buds?
(a) Auxin
(b) Gibberellin
(c) Cytokinin
(d) Abscisic acid
Answer: D

Question. Which of the following is not a ductless gland?
(a) Adrenal
(b) Liver
(c) Thyroid
(d) Pituitary
Answer: B

Question. Reflex arc is formed by
(a) muscle → brain → receptor
(b) muscle → spinal cord → receptor
(c) receptor → brain → muscles
(d) receptor → spinal cord → muscle
Answer: D

Question. The hormone that is used to keep flowers fresh is
(a) cytokinin
(b) gibberellins
(c) auxin
(d) abscisic acid
Answer: A

Question. Brain stem is formed by the union of:
(a) optic lobes
(b) cerebellum with optic lobes
(c) corpora striata
(d) none of the above
Answer: D

Question. Hormone from thyroid gland is:
(a) thyroxine
(b) thyrodine
(c) parathyroxin
(d) thyroprotein
Answer: A

Question. Growth of pollen tube towards ovule during fertilisation is an example of
(a) phototropism
(b) geotropism
(c) chemotropism
(d) hydrotropism
Answer: C

Question. The major hormones involved in the maintenance of blood glucose levels are produced by the:
(a) Liver
(b) Pancreas
(c) Spleen
(d) Gall bladder
Answer: B

Question. The pineal body is considered as:
(a) an endocrine gland
(b) an organ concerned with voluntary actions
(c) an organ concerned with vision
(d) a vestige of third eye and endocrine gland
Answer: D

Question. Which controls the balance of human body?
(a) cerebrum
(b) cerebellum
(c) optic lobes
(d) spinal cord
Answer: B

Question. The role of the axon is to:
(a) integrate signals from the dendrites
(b) release neurotransmitter
(c) conduct the action potential to the synaptic terminal
(d) synthesize cellular components
Answer: C

Question. The natural plant hormones were first isolated from:
(a) cotton fruits, spinach leaves, rice plant
(b) avena coleoptile, spinach leaves, fungus Gibberella
(c) corn germ oil, human urine
(d) human urine, rice plant
Answer: B

Question. A high concentration of synthetic auxins is generally used for:
(a) weed control
(b) enhancing root initiation
(c) controlling of cell enlargement
(d) preventing the growth of the lateral buds
Answer: A

Question. In our body, calcium and phosphorus ions are controlled by:
(a) thyroid gland
(b) pituitary gland
(c) adrenal gland
(d) parathyroid gland
Answer: C

Question. Breathing rate in mammals is controlled by a part of the brain called the:
(a) Thalamus
(b) Hypothalamus
(c) Medulla oblongata
(d) Cerebellum
Answer: C

True and False :

Question. The shoots of a potted plant kept near the window bend towards sunlight because of negative phototropism.
Answer: False

Question. Insulin is given to the person suffering from goitre. 
Answer: False

Question. A cell or group of cells in a sense organ which is sensitive to a particular type of stimulus is called receptor. 
Answer: True

Question. Reflex action is an autonomic motor response without the involvement of brain. 
Answer: True

Question. Growth inhibitors are Ethylene and ABA.
Answer: True

Question. The propagation of a nerve impulse is due to changes in the permeability of the nerve cell membrane that allows for a voltage difference across the membrane.
Answer: True

Question. Mimosa plant showing seismonfastic movement.
Answer: True

Question. A neuron transmits electrical impulses not only to another neuron but also to muscle and gland cells.
Answer: True

Question. Cytokinins are present in greater concentration in young fruits and seeds.
Answer: True

Question. Only the vertebrates have a nervous system.
Answer: False

Question. Rise in sugar level in blood stops secretion of insulin by pancreas.
Answer: True

Question. The central nervous system consists of the brain and spinal cord.
Answer: True

Question. Stems are positively geotropic while roots are negatively geotropic.
Answer: False

Question. Junction between two neurons is called synapse.
Answer: True

Question. Brain is the structural and functional unit of nervous system.
Answer: False

Fill in the Blanks :

Question. Posture and balance of the body is controlled by ____________ .
Answer: cerebellum

Question. The movement of shoot towards light is ____________ .
Answer: phototropism

Question. The movement of sunflower in accordance with the path of sun is due to ____________ .
Answer: phototropism

Question. Central nervous system consists of ……… and ……… .
Answer: brain, spinal cord

Question. Largest part of the brain is ……… .
Answer: cerebrum

Question. Defeciency of ……… hormone in childhood leads to dwarfism in humans.
Answer: growth

Question. The growth of pollen tubes towards the ovules is the result of a ……… movement.
Answer: chemotropic

Question. Sneezing is a .......... .
Answer: reflex action

Question. .......... is the irreversible increase in size, volume or weight of an organ or organism.
Answer: Growth

Question. ......... and .......... show thermonastic movements.
Answer: Tulips, crows

Question. .......... movements are growth movements of plants in response to a stimulus from a specific direction.
Answer: Tropic

Question. The nervous system uses .......... to transmit messages.
Answer: electrical impulses

Question. .......... coordinates the activity of picking up pencil for writing.
Answer: cerebellum

Question. .......... promotes senescence and is found in high concentration in ripened fruits.
Answer: thylene

Question. Reflex are formed in spinal cord also sends information input to .......... .
Answer: brain

Question. If the dark period is interrupted by flashes of light .......... plant will not flower.
Answer: Short day

Matching Questions

DIRECTION : Each question contains statements given in two columns which have to be matched. Statements (A, B, C, D) in column I have to be matched with statements (p, q, r, s) in column II.

Question.

Answer: A-q, B-s, C-r, D-p

Question.

Answer: A-q, B-p, C-s, D-r

Question.

Answer: A-t, B-t, C-p, D-q

Question.

Answer: A-t, B-r, C-s, D-q

Question.

Answer: A-p, B-q, C-r, D-s

Question.

Answer: 1-(c), 2-(a), 3-(e), 4-(f), 5-(d), 6-(b)

Assertion and Reason

DIRECTION : In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
(b) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
(c) Assertion (A) is true but reason (R) is false.
(d) Assertion (A) is false but reason (R) is true.
(e) Both Assertion and Reason are false.

Question. Assertion : Reflex actions are automatic and repid responses to stimuli.
Reason : These actions are controlled by brain.
Answer: C

Question. Assertion : Males have more stature than females during puberty.
Reason : This is because of presence of thyroxin in the blood of femalses.
Answer: C

Question. Assertion : Auxins are in the grwoing tips of the plant.
Reason : Auxin concentration is highest at the tip of the root.
Answer : C

Question. Assertion : Cyton region of nerve fibre collects information for the brain.
Reason : Nerve fibres can either have or lack myelin sheath.
Answer : D

Question. Assertion : The effect of auxin hormone on the growth of root is exactly opposite to that on a stem.
Reason : Auxin hormone increases the rate of growth in root and decreases the rate of growth in stem.
Answer : C

Question. Assertion : A person has lost most of its intelligence memory and judgement.
Reason : A person has operated a tumour located in the cerebrum.
Answer : A

Question. Assertion : Insulin regulates blood sugar level.
Reason : Insufficient secretion of insulin will cause diabetes.
Answer : A

Question. Assertion : Nerve impulse is a one way conduction.
Reason : Nerve impulse is transmitted from dendrite to axon terminals.
Answer : C

Question. Assertion : Abscisic acid is a stress hormone.
Reason : Stimulation of ABA occurs in adverse conditions.
Answer : A

Question. Assertion : Failure of secretion of growth hormone from an early age causes dwafrism in the patient.
Reason : Growth hormone stimulates the body growth and elongation of long bones.
Answer : A

Very Short Answer type Questions :

Question. Which part controls the involuntary actions such as coughing, sneezing and vomiting?
Answer: Medulla of hind-brain.

Question. What is the significance of reflex action?
Answer: Reflex action enables the animal to respond quickly and relieves the brain from excess work.

Question. Name the hormone that regulates blood sugar level. 
Answer: Insulin.

Question. Name the two components of central nervous systems in humans. 
Answer: The two components of Central Nervous System in human are brain and spinal cord.

Question. Which gland is known as master gland? 
Answer: Pituitary gland.

Question. How is the spinal cord protected in the human body?
Answer: Spinal cord is enclosed in a bony cage called vertebral column.

Question. A potted plant is made to lie horizontally on the ground. Which part of the plant will show
(a) positive geotropism?
(b) negative geotropism?
Answer: (a) Root
(b) Shoot

Question. Mention the components of fore-brain.
Answer: Cerebrum and olfactory lobes.

Question. Name two tissues that provide control and coordination in multicellular animals.
Answer: The two tissues that provide control and coordination in multicellular animals are nervous and endocrinal tissues.

Question. Mention the function of the hind-brain in humans.
Answer: Hind-brain coordinates the body movements and posture. It also controls respiration.

Question. What is the difference between a reflex action and walking?
Answer: A reflex action is voluntary action which is a rapid and automatic response to stimuli while walking is a voluntary action which requires our thinking and in our control.

Question. What happens at the synapse between two neurons?
Answer: A synapse is the gap between the two neurons. At synapse the electrical signals converted into chemicals that can easily cross over the gap and pass on to the next neurons where it again converted into electrical signals.

Question. Which part of the brain maintains posture and equilibrium of the body?
Answer:Cerebellum

Question. Give an example of a plant hormone that promotes growth.
Answer: Auxin

Short Answer type Question :

Question. How do we detect the smell of an agarbatti (incense stick)?
Answer: When the smell of the incense stick reaches to our nose then the olfactory receptors present in our nose detects it send this information in fore brain in the form of electrical signals. Fore brain interprets this information as the smell of incense stick where it is already stored.

Question. What is the role of the brain in reflex action?
Answer: Brain has no direct involvement in reflex action. It is mainly controlled by Spinal Cord as these action not requires thinking and are very quick action.

Question. What are plant hormones?
Answer: Plant hormones are the fluids which are secreted within the plant also known as phytohormones. Plant hormones regulate the growth and development of the plant. Examples of plant hormones are auxin, gibberellins etc.

Question. How is the movement of leaves of the sensitive plant different from the movement of a shoot towards light?
Answer: The movements of the leaves of the sensitive plant are touch sensitive and independent of growth while the movement of the shoot towards light is growth related and known as phototropism.

Question. How do auxins promote the growth of a tendril around a support?
Answer: When tendrils come in contact with any support, the part of the tendril in contact with the object does not grow as rapidly as the part of the tendril away from the object. This is caused by the action of auxin hormone. Less auxin occurs on the side of contact as compared to the free side as a result, auxin promotes growth on the free side and the tendrils coil around the support.

Question. Design an experiment to demonstrate hydrotropism.
Answer: Take two small beakers and label them as A and B. Fill beaker A with water. Now make a cylindrical-shaped roll from a filter paper and keep it as a bridge between beaker A and beaker B, as shown in the figure. Attach few germinating seeds in the middle of the filter paper bridge. Now, cover the entire set-up with a transparent plastic container so that the moisture is retained.
Observation:
The roots of the germinating seeds will grow towards beaker A.  

Question. How does chemical coordination take place in animals?
Answer: Chemical coordination takes place in animals with the help of hormones. Hormones are the chemical fluids that are secreted by the glands of the endocrine system. Hormones regulate the overall growth and development of the animals.

Question. Why is the use of iodised salt advisable?
Answer: Iodine stimulates the thyroid gland to produce thyroxin hormone. It regulates carbohydrate, fat, and protein metabolism in our body. Deficiency of this hormone results in the enlargement of the thyroid gland. This can lead to goitre, a disease characterized by swollen neck. Therefore, iodised salt is advised for normal functioning of the thyroid gland.

Question. How does our body respond when adrenaline is secreted into the blood?
Answer: When someone is in danger or in emergency then adrenal gland secrete adrenaline hormone. It is secreted directly into the blood and is transported to different parts of the body. It speeds up the heartbeat and hence supplies more oxygen to the muscles. This results in increasing breathing rate and blood pressure which enable them to fight with such urgent situation 

Question. Why are some patients of diabetes treated by giving injections of insulin?
Answer: Diabetes is caused due to less or no secretion of hormone insulin by pancreas. In such a person, blood sugar level is high. Insulin converts extra sugar present in blood into glycogen. Thus, patients suffering from diabetes are given insulin injection to control their blood sugar level.

Question. What is the function of receptors in our body? Think of situations where receptors do not work properly. What problems are likely to arise?
Answer: Functions of receptors:
→ They sense the external stimuli such as heat or pain.
→ They also trigger an impulse in the sensory neuron which sends message to the spinal cord.
When the receptors are damaged, the external stimuli transferring signals to the brain are not felt. For example, in the case of damaged receptors, if we accidentally touch any hot object, then our hands might get burnt as damaged receptors cannot perceive the external stimuli of heat and pain.

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

Answer: Functions of the three parts of a neuron:
→ Axon: It conducts messages away from the cell body.
→ Dendrite: It receives information from axon of another cell and conducts the messages towards the cell body.
→ Cell body: It contains nucleus, mitochondria, and other organelles. It is mainly concerned with the maintenance and growth.

Question. How does phototropism occur in plants?
Answer: The growth movement in plants in response to light stimulus is known as phototropism.The shoots show positive phototropism and the roots show negative phototropism. This means that the shoots bend towards the source of light whereas the roots bend away from the light source.
For Example: The flower head of sunflower is positively phototropic and hence it moves from east to west along with the sun.

Question. Which signals will get disrupted in case of a spinal cord injury?
Answer: In case of the spinal cord injury, the signals coming from the nerves as well as the signals coming to the receptors will be disrupted. As both these signals meet in a bundle in spinal cord so there is any spinal cord injury then both these signals are disrupted.

Question. How does chemical coordination occur in plants?
Answer: Chemical coordination occurs in plants with the help of plant hormones. Different plant hormones help to coordinate growth, development, and responses to the environment.
They are synthesized at places away from where they act and diffuse to the area for action, For example, auxin promotes cell growth, gibberellins promote stem growth, cytokinins promote cell division and abscisic acid inhibits growth and its effects include wilting of leaves.

Question. What is the need for a system of control and coordination in an organism?
Answer: There are various organs in an organism. These organs must be carefully controlled and coordinated for the survival of an organisms. In the body of an organism various fluids are secreted from the glands of the endocrine system. These hormones are responsible for the overall growth and development of an organism. All others daily decision that includes voluntary and involuntary action are controlled by central nervous system(CNS).

Question. How are involuntary actions and reflex actions different from each other?
Answer: Involuntary action is the set of muscle movement which do not require thinking. But it is controlled by brain for example beating of heart beat while on the other hand, the reflex action is rapid and spontaneous action in response to any stimulus. For example closing of eyes immediately when bright light is focused.

Question. Compare and contrast nervous and hormonal mechanisms for control and coordination in animals.
Answer: Nervous System Mechanism 
• It is consist of nerve impulses between PNS, CNS and Brain.
• The axons and dendrites transmit the information through a coordinated effort
• The flow of information is rapid and the response is quick.
• Nerve impulses are not specific in their action.
• Effects are short lived
Hormonal System Mechanism
• It consists of endocrine system which secretes hormones directly into blood
• The information is transmitted or transported through blood.
• The information travels slowly and the response is slow.
• Each hormone has specific actions
• It has prolonged effects

Question. What is the difference between the manner in which movement takes place in a sensitive plant and the movement in our legs?
Answer: Movement in sensitive plants
• The movement in a sensitive plant is a response to stimulus(touch) which is a involuntary action
• No special tissue is there for the transfer of information
• Plant cells do not have specialised protein for movements.
Movement in our legs
• Movement in our legs is a voluntary action.
• A complete system CNS and PNS is there for the information exchange
• Animal cells have specialised protein which help muscles to contract.