Question 1

Question 1Explain the structure of a nerve cell with the help of a diagram.

Accepted Answer

A nerve cell or neuron is the basic structural unit of the nervous system. It has three parts — cell body, axon and dendrites.The cell body called cyton contains the nucleus.Many short fibres called dendrons arise from the cell. They further divide to form dendrites. Dendrites receive messages from other neurons.A single, long fibre called axon extends from the other side of the cell body. It is covered by a sheath called myelin sheath.Below diagram shows the structure of a neuron:

Question 2

Question 3Describe the central nervous system along with its parts and functions.

Accepted Answer

The central nervous system consists of the brain and the spinal cord. It is the control centre for all body functions. It is the site for all information processing in the body. It is responsible for processing every sensation and thought a human being experiences. It has two parts — Brain and Spinal Cord.Brain — The Brain is the main control centre of the nervous system situated in the cranium of the skull. It controls our thinking, feelings, movement and senses. It has three parts — Cerebrum, Cerebellum and Medulla oblongata.Cerebrum — The cerebrum is the uppermost, largest and the most prominent part of the brain. It is responsible for the sensation of pain, temperature, touch, sight, sound, taste and smell. It also controls mental activities such as memory, intelligence, thinking and reasoning.Cerebellum — The cerebellum is a small, egg-shaped lobe located at the base under the cerebrum. It helps in the muscle coordination and balance of the body.Medulla oblongata — The Medulla oblongata is the lowermost part of the brain located at the base of the skull. It controls breathing, heartbeat, coughing, sneezing and other involuntary functions.Spinal cord — The spinal cord is the continuation of the medulla oblongata of the brain. It is like a cord that emerges from a hole at the base of the skull and runs through the vertebral column. The spinal cord conducts reflexes below the neck. It conducts sensory impulses from the skin and muscles to the brain. It conducts motor responses from the brain to the muscles of the trunk and limbs.

Question 3

Question 2sensory nerves and mixed nerves.

Accepted Answer

Sl.No.Sensory NervesMixed Nerves1.Sensory nerves are the nerves that carry messages from the sense organs to either the spinal cord or the brain.Mixed nerves perform the function of both sensory nerves and motor nerves. They transmit messages from the central nervous system to the muscles of the body.2.They contain only sensory fibres.They contain sensory fibres as well as motor fibres.3.For example, the optic nerve that sends messages from the eye to the brain is a sensory nerve.For example, the nerve that transmits messages to the tongue is a mixed nerve.

Question 4

Question 4cerebrum and cerebellum

Accepted Answer

Sl.No.CerebrumCerebellum1.It is the uppermost, largest and the most prominent part of the brain.It is a small, egg-shaped lobe located at the base under the cerebrum.2.It is highly convoluted in appearance with ridges and grooves.It does not have convolutions, but has many furrows.3.It controls mental activities such as thinking and reasoning, memory, intelligence and perception of taste, pain and touch etc.It coordinates the movement of voluntary muscles and maintains the balance of the body.

Question 5

Question 5The cerebrum controls the balance of the body.

Accepted Answer

FalseCorrected statement — The cerebellum controls the balance of the body.

Source: This question is from Nervous System in Humans, Biology &mdash; Class 7, ICSE Board.
Key Concepts CoveredThis question tests your understanding of the following concepts from the chapter Nervous System in Humans: Question, Cerebrum, Controls, Balance, Body, Nervous System in Humans. These are fundamental topics in Biology that students are expected to master as part of the ICSE Class 7 curriculum.A thorough understanding of these concepts will help you answer similar questions confidently in your ICSE examinations. These topics are frequently tested in both objective and subjective sections of Biology papers. We recommend revising the relevant section of your textbook alongside practising these solved examples to build a strong foundation.
How to Approach This QuestionRead the question carefully and identify what is being asked. Break down complex questions into smaller parts. Use the terminology and concepts discussed in this chapter. Structure your answer logically — begin with a definition or key statement, then provide supporting details. Review your answer to ensure it addresses all parts of the question completely.
Key Points to RememberUse precise scientific terminology as defined in the textbook.
Draw and label diagrams neatly for full marks.
Understand the difference between structure and function.
Learn processes step-by-step in the correct sequence.
Related Questions from Nervous System in HumansQ1: Question 1 Explain the structure of a nerve cell with the help of a diagram.
Q2: Question 2 sensory nerves and mixed nerves.
Q3: Question 3 Describe the central nervous system along with its parts and functions.
Q4: Question 4 cerebrum and cerebellum
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