Exam-style CBSE practice questions on Animals - Nervous System (Control and Coordination). Try each one first, then reveal the correct answer and a step-by-step explanation. Free, from EduLevel — the AI teacher for CBSE.
The junction or gap between two adjacent neurons is known as a:
Think about how nerve cells communicate with each other. There's a specific term for the space or connection point where this communication happens.
Explanation: A synapse is the specialized junction where a nerve impulse is transmitted from one neuron to another across a minute gap.
Which of the following functions is the brain responsible for?
Consider the wide range of activities our body performs, both conscious and unconscious. The brain acts as the central control system for many of these.
Explanation: The brain controls all these functions: the cerebrum is for thinking, the medulla regulates the heartbeat, and the cerebellum maintains body balance.
This question consists of two statements: Assertion (A) and Reason (R). Select the correct answer from the given codes. Assertion (A): In actions like writing or talking, our nervous system communicates with the muscles. Reason (R): Cranial nerves and spinal nerves constitute the peripheral nervous system.
Consider the two main divisions of the nervous system and their respective roles in controlling body functions and transmitting signals.
Explanation: Both statements are factually correct. However, the Reason (R) merely defines a part of the nervous system and does not explain the mechanism of neuromuscular communication mentioned in the Assertion (A).
What is the correct sequence for the path of an electrical impulse within a neuron?
Think about how a neuron receives information and then transmits it to the next cell.
Explanation: A nerve impulse is first received by the dendrites, then travels to the cell body, is transmitted along the axon, and finally reaches the nerve ending.
In a nerve cell, what is the name of the site where an electrical impulse is transformed into a chemical signal?
Think about where one nerve cell communicates with another cell, or with a muscle or gland. This communication often involves a chemical messenger.
Explanation: The conversion from an electrical impulse to a chemical signal occurs at the synapse, where neurotransmitters are released. A neuromuscular junction is a specialized synapse between a neuron and a muscle cell.
In which sense organ are olfactory receptors, responsible for the sense of smell, located?
Think about the primary function associated with each sense organ listed. Which one is most directly linked to detecting airborne particles that we perceive as smells?
Explanation: Olfactory receptors are specialized sensory cells located in the nasal cavity, which are responsible for detecting smells.
What is the correct sequence of events that occurs when a person's hand unconsciously touches a hot object?
Think about the journey of a signal starting from where it's detected. The body needs to first sense the heat and then send a message to the brain or spinal cord before any action is taken.
Explanation: The correct pathway for a reflex arc is: stimulus detected by receptors, signal sent via sensory neuron to the spinal cord, processed by a relay neuron, and a response command sent via motor neuron to the effector muscle.
The sensory nerve of a reflex arc carries information from the receptor cells to the:
Think about the pathway of a signal during a reflex action. Where does the initial detection of a stimulus occur?
Explanation: In a reflex arc, the sensory neuron carries the nerve impulse from the receptor to the spinal cord for immediate processing, bypassing the brain for a faster response.
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