NCERT Solutions for Class 10 Science Chapter 6 – Control and Coordination Important Questions
Here are the important questions for CBSE Class 10 Science Chapter 6 – Control and Coordination. The important questions we have compiled will help the students to brush up on their knowledge about the subject. Students can practice Class 10 Science Chapter 6 – Control and Coordination to understand the subject better and improve their performance in the board exam. The solutions provided here will also give students an idea about how to write the answers. Take Free Online MCQ Test for Class 10.
Q1. Which neuron conducts impulses faster?
Ans. Medullated neurons conduct impulse faster as impulse moves in a jumping manner that is from one node of Ranvier to another (saltatory conduction).
Whereas the nerve impulse in non-medullated neurons is quite slow.
Q2. How nerve impulse passes through synapse?
Ans. Under microscope, axon end appears to be knob like which has synaptic vesicles it it. These synaptic vesicles store a chemical neurotransmitter.
We can clearly see the fluid in synapse and we can also see the receptors on the dendrite of another neuron. When impulse reaches the axonal end calcium ions are released from neurolemma that stimulates the secretion to neurotransmitter from vesicles into synapse.
As the synaptic fluid moves, the neuro-transmitter also moves and as soon it touches the dendrite receptors of another neuron the message is delivered. In response the receptors secrete anti neuro transmitter that further stops the secretion of neuro transmitter. Hence, this is how the impulse travel through synapse
Q3: Why does a plant droop when kept inside the room?
Ans: The plant droops when kept inside the room as it doesn’t get complete sunlight, so auxin gets accumulated only at one side. Therefore the growth occurs in only that region where Auxin accumulates therefore the plant droops.
Geotropism: The movement caused in plants in response to gravity.
Chemotropism: The movement caused in plants in response to chemicals.
Nastic Movements: These are the movements that occur in the direction of stimulus.
For Example: It is seen in touch me not plant (mimosa pudica). The stimulus for it is touch. When we touch, the leaf closes.
Q4. Why do people living near coastal areas suffer less from goiter?
Ans. This is because they mainly feed on sea food and sea water which has iodine in it.
Q5. What is Synapse?
Ans. It is the junction between two neurons.
Q6. Draw the structure of Neuron.
Ans.
Q7. Name: Emergency Hormone, Birth Hormone?
Ans. Adrenalin and Oxytocin
Q8. What is a reflex arc, explain its mechanism.
Ans. The total path covered in reflex action is reflex arc.
