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NCERT Class 10 Science Control and Coordination: In-text questions (page 111) Solutions
AI-written, checked on 23 Oct 2026
Solutions written by Shishya, checked — not the board's official answers
Step-by-step working for every question of In-text questions (page 111) in NCERT's Class 10 Science book, chapter “Control and Coordination”, written by Shishya. Each question is in our own short words; open the NCERT chapter for the exact wording and figures.
How these were checked: the solutions were drafted with AI and then read and corrected on 23 Oct 2026. Every numerical final answer is recomputed from the question's own numbers by a calculator check that runs before each release; proofs and explanations were read, not machine-checked. The NCERT textbook is the authority — if something here disagrees with it, follow the book.
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In-text (page 111) Q1
How does chemical coordination take place in animals?
- Chemical coordination in animals is carried out by the endocrine system.
- The endocrine system consists of glands that secrete hormones directly into the blood.
- These hormones travel through the bloodstream to reach specific target organs or cells.
- Once at the target site, the hormones bind to receptors and trigger a specific physiological response.
- This process allows the body to regulate growth, metabolism, reproduction, and other vital functions.
- Unlike the nervous system, which uses electrical signals, chemical coordination relies on chemical messengers for slower but longer-lasting effects.
Answer: Chemical coordination in animals takes place through the endocrine system, where glands secrete hormones into the blood that travel to target organs to regulate various body functions.
In-text (page 111) Q2
Why is using iodised salt advisable?
- Iodine is an essential trace element required for the synthesis of thyroid hormones.
- The thyroid gland uses iodine to produce thyroxine, which regulates the body's metabolic rate.
- A deficiency in iodine leads to an enlarged thyroid gland, commonly known as goitre.
- Iodised salt provides a reliable and affordable source of iodine in the diet.
- Consuming iodised salt helps prevent iodine deficiency disorders and maintains normal thyroid function.
Answer: Using iodised salt is advisable to prevent iodine deficiency and associated disorders like goitre by ensuring adequate intake of iodine for thyroid hormone production.
In-text (page 111) Q3
How does our body respond when adrenaline is secreted into the blood?
- Adrenaline is released by the adrenal glands into the bloodstream during stress or emergency situations.
- It acts on the heart to increase the rate of heartbeat and the force of its contractions.
- This action raises the blood pressure to ensure more blood is pumped to the muscles.
- Adrenaline also causes the dilation of the bronchioles in the lungs to allow for deeper and faster breathing.
- The body diverts blood flow from non-essential organs like the digestive system to the skeletal muscles.
- This physiological state prepares the body for a rapid 'fight or flight' response to handle the emergency.
Answer: The body responds by increasing the heart rate and blood pressure, dilating the bronchioles, and diverting blood to muscles to prepare for a fight or flight response.
In-text (page 111) Q4
Why are some diabetes patients treated with insulin injections?
- Diabetes is a condition where the body cannot regulate blood sugar levels properly.
- This happens because the pancreas does not produce enough insulin or the body does not respond to it.
- Insulin is a hormone that helps cells absorb glucose from the blood to use as energy.
- Without sufficient insulin, glucose builds up in the blood, causing high blood sugar.
- Since the body cannot make enough insulin on its own, it must be supplied from outside.
- Insulin is a protein, so it would be digested if taken orally, making injections necessary.
- Injections deliver insulin directly into the bloodstream to control blood sugar levels.
Answer: Some diabetes patients need insulin injections because their pancreas does not produce enough insulin to regulate blood sugar, and insulin must be injected to work effectively.
Other exercises in this chapter
- In-text questions (page 105) — 5 questions
- In-text questions (page 108) — 5 questions
- End-of-chapter exercises — 12 questions
← Control and Coordination: notes, practice and all exercises
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