CBSE Class 10 Biology Control And Coordination Worksheet Set C

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 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 auxins, gibberellins, cytokinins, Abscisic acid and ethylene.

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 : 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 detect it and 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 this action not requires thinking and is very quick action.

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

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

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 : 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 : 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 travel through the blood and regulate the overall growth and development of the animals.

Question : Why is the use of iodized salt advisable?
Answer : Because 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.

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.