Home
Class 12
BIOLOGY
Assertion :- Minimum stimulus required t...

Assertion :- Minimum stimulus required to open Na+ VGC as the result of which depolarisation occurs, is called action potential.
Reason:- Average value of RMP is +70 mV.

A

If both assertion and reason are true and reason is the correct explanation of assertion.

B

If both assertion and reason are true but reason is not the correct explanation of assertion.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the given question, we will break it down into the assertion and the reason, and evaluate their truthfulness. ### Step 1: Analyze the Assertion The assertion states: "Minimum stimulus required to open Na+ VGC as the result of which depolarization occurs, is called action potential." - **Evaluation**: This statement is incorrect. The minimum stimulus required to open sodium voltage-gated channels (Na+ VGC) is referred to as the "threshold stimulus," not action potential. Action potential is the result of reaching this threshold stimulus, leading to depolarization. ### Step 2: Analyze the Reason The reason states: "Average value of RMP is +70 mV." - **Evaluation**: This statement is also incorrect. The resting membrane potential (RMP) is typically around -70 mV, not +70 mV. The positive value mentioned refers to the peak of the action potential, not the resting state. ### Step 3: Conclusion Both the assertion and the reason are false. Therefore, the correct answer to the question is that both the assertion and reason are false. ### Final Answer The correct option is: **Both assertion and reason are false.** ---
Promotional Banner

Topper's Solved these Questions

  • NEUTRAL AND COORDINATION

    MOTION|Exercise Exercise -3 (AIPMT & NEET Previous Year Questions)|16 Videos

  • MORPHOLOGY OF FLOWERING PLANTS

    MOTION|Exercise EXERCISE - 4 (AIIMS |ASSERTION & REASON QUESTIONS )|38 Videos

  • ORGANISM AND ENVIRONMENT

    MOTION|Exercise CHECK YOUR CONCEPTS-2|5 Videos

Similar Questions

Explore conceptually related problems

Assertion :- Threshold stimulus is required for propagation of impulse Reason:- Threshold stimulus produce action potential therefore conduction of impulse occur.

Assertion: The minimum number of vectors of unequal magnitude required to produce zero resultant is three. Reason: Three vectors of unequal magnitude which can be represented by the three sides of a triangle taken in order, produce zero resultant.

A list of events occurring in the transmission of nerve impulse across the synapse is given below in a random order (i)Opening of specific ion channels allows the entry of ions, a new action potential is generated in the post-synaptic neuron. (ii)Neurotransmitter binds to the receptor on post synaptic membrane. (iii)Synaptic vesicle fuses with pre-synaptic membrane, neurotransmitter release into synaptic cleft. (iv)Depolarisation of pre-synaptic membrane. (v)Arrival of action potential at axon terminal. Which of the following options represents these events in a correct order ?

A colliison between reactant molecules must occur with a certain minimum energy before it is effective in yielding Product molecules. This minimum energy is called activation energy E_(a) Large the value of activation energy, smaller the value of rate constant k . Larger is the value of activation energy, greater is the effect of temperature rise on rate constant k . E_(f) = Activation energy of forward reaction E_(b) = Activation energy of backward reaction Delta H = E_(f) - E_(b) E_(f) = threshold energy In a hypothetical reaction A rarr B , the activation energies for the forward and backward reactions are 15 and 9 kJ mol^(-1) , respectively. The potential energy of A is 10 kJ mol^(-1) . Which of the following is wrong?

In p-n junction diode, near junction holes combine with electrons, and impurity ions form a barrier potential which opposes the recombination of electron-hole pairs. Value of barriers potential for Si is 0.7 volt and for Ge is 0.3 V. thus charge density at the junction becomes zero and an electric field is produced near junction. this region is called depletion layer. Thickness of depletion layer is of the order of 10^(-6) meter. in forward bias p terminal is connected with the positive terminal of cell and n is connected with negative terminal of cell and n is connected with negative terminal of cell. as forward voltage is increased, current increases exponentially. For Si diode minimum required forward voltage so that current can flow is

Read the following paragraph and answer the questions given below , Stable equilibrium is of various type . Mechanical equilibrium is achieved when all particles are at rest and total potential energy of the system is minimum . At any stage where particles are at rest but the system is not at stabel equilibrium as it can reduce its potential energy by reverting to another position, is called metastable equilibrium . Thermal equilibrium is result from the absence of temperature gradients in the system. chemical equilibrium is obtained when no further reaction occurs between reacting substances, i.e forward and reverse rates of reaction are equal. when steam with solid iron at high temperature Fe_3O_4(s) and hydrogen gas are produced . But the reaction never goes to completion. this is because as the products are formed the reaction proceeds in reverse direction and when rate of reverse reaction is equal to rate of forward reaction , the concentration of reactants and products become constant and equilibrium is reached. Which of the following is correct ?

a. SAN generates as action potential which stimulates atrial systole. b. ECG is an electrical representation of the graphical activity of the heart during a cardiac cycle. c. The cardiac output of a normal man will be much lesser than an athlete. d. The wall of right ventricle is much thicker than the left ventricle e. In pisces the two separate circulatory pathways are present, hence they have double circulation. f. The clsoed circulatory pattern is considered to be more advantageous than open circulatory pattern. g. Glucose is absorbed by simple diffusion through lymph in lacteales present in the intestinal villi. h. The SAN can generate the maximum number of action potential i.e. 140-150 mi n^(-1) in neonates, and is responsible for initiation and maintenance of the rhythmic contractile activity of the heart. i. Angina can occur in any age but more common among the neonates and infants. j. heart failure is sometimes called congestive heart failure because congestion of the blood vessels is one of the main symptoms of this disease.

Festival season is going in Agrabah and the people are going crazy to see various sorcerers, craftsmen etc. who are visiting the city to showcase their magic. A large crowd has gathered around a Card-master who is asking a logical riddle to the crowd. Whosoever succeeds in solving the riddle gets a reward. He arranges the cards of first 20 natural numbers and lists down the difference between two consecutive numbers (value on right card minus value on the left card) of the arrangement, which are 19 in number. The difference is given as -11 8 -7 -2 11 -4 12 -15 11 3 -13 9 -1 -3 6 -10 -3 5 9 The city is beautifully lightened up with candles and diyas and the vibes of happiness and joy were coming from all the directions. Aladdin and Abu are also enjoying the festival when they find a very interesting game of balloons. Inflated balloons are arranged in a straight line and are marked with English Upper case letters. The player can perform the following action any number of times (including zero): Choose any one of the balloons from the straight line and replace the letter on it with any other Uppercase English letter. Note that even if the replaced letter occurs S multiple times, only the chosen occur- rence of this letter is replaced. Find the sum of the minimum number of operations required to convert the given balloon line to balanced ones. Let's call a balloon line balanced if all characters that occur in this balloon line occur the same number of times. Line 1: ABAAACDHIAACKIOA (16 letters) Line 2: BBCABCDFAHABNAJHDYWGEJA (23 letters) Line 3: ABSDJAHSABDJAMDHANDHASAKIABCHD (30 letters)

MOTION-NEUTRAL AND COORDINATION-Exercise -4
  1. Assertion. Conditional reflex is not lost with time. Reason. Conditi...

    Text Solution

    |

  2. Assertion :- A neurotransmitter crosses the synapse and attaches to re...

    Text Solution

    |

  3. Read the assertion and reson carefully to mark the correct option out ...

    Text Solution

    |

  4. Assertion. Transmission of a nerve impulse across a synape is brought ...

    Text Solution

    |

  5. A : Sense organs, do not interpret the stimulus, it is done by brain. ...

    Text Solution

    |

  6. Assertion :- In human being, cerebrum is most developed part of brain....

    Text Solution

    |

  7. Assertion :- Spinal cord act as a bridge between brain & organs of the...

    Text Solution

    |

  8. Assertion : A cerebellum is related with skillful voluntary movement a...

    Text Solution

    |

  9. Assertion :- Threshold stimulus is required for propagation of impulse...

    Text Solution

    |

  10. Assertion :- Conditioned reflex is not present at birth. Reason:- In...

    Text Solution

    |

  11. Assertion :- ANS is controlled by hypothalamus. Reason:- Parasympath...

    Text Solution

    |

  12. Assertion :- Speed of nerve impulse is faster on medullated nerve fibr...

    Text Solution

    |

  13. Assertion :- Neuron is the longest cell of human body. Reason:- It c...

    Text Solution

    |

  14. Assertion :- Nerve impulse conduction is one way conduction. Reason:...

    Text Solution

    |

  15. Assertion :- In a myelinated nerve fibre the impulse jumps from one no...

    Text Solution

    |

  16. Assertion :- Minimum stimulus required to open Na+ VGC as the result o...

    Text Solution

    |

  17. Assertion :- Midbrain, pons and medulla constitute to form brain stem....

    Text Solution

    |

  18. Assertion :- All branches of spinal nerves except Ramus communicans ar...

    Text Solution

    |

  19. Assertion :- Sensory neuron from toes to CNS is one of the longest ner...

    Text Solution

    |

  20. Assertion :- Corpus callosum connect the two cerebral hemispheres. Rea...

    Text Solution

    |