Chemical Coordination and Integration — Class 11 MCQs with Answers
Class 11 CBSE Biology · Chapter 19
90 practice questions · 30 Easy · 30 Medium · 30 Hard · Updated
Jump to the 6 solved questions
Practise the most important Class 11 CBSE Biology questions from Chapter 19, "Chemical Coordination and Integration". You get 9 timed quizzes made from 90 NCERT-based MCQs, with answers and explanations. The questions are split into 30 Easy, 30 Medium and 30 Hard. Warm up on the basics, then move on to the exam-level questions that top scorers in CBSE & Maharashtra HSC Board exams, MHT-CET and NEET UG get right.
To score well in "Chemical Coordination and Integration", focus on diagrams, key terms and knowing NCERT line by line. Each MCQ here is timed and uses exam-style marking (+4 correct, −1 wrong, 0 skipped). This helps you stay accurate when time is short, just as real papers need. Every question has a short explanation, so a wrong answer becomes a quick lesson. It is the fastest way to fix gaps before a test.
Use this chapter for focused revision. Start with the Easy set to check your basics on Chemical Coordination and Integration, then move to Medium and Hard to practise applying them. Your accuracy, streaks and XP save automatically. This chapter also adds to your overall Class 11 Biology mastery score. Try the 6 sample questions below: tap an option to see the answer and a worked explanation. Sign in free to start practising.
Chemical Coordination and Integration — important questions & MCQs with answers (Class 11 Biology)
6 solved questions from this chapter's difficulty levels, each with its answer and explanation. Tap an option to check yourself.
0 of 6 answered
- Q1 of 6Easy
Master gland of endocrine system:
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Answer: Pituitary
Explanation: The anterior pituitary releases tropic hormones (TSH, ACTH, LH/FSH) that drive the thyroid, adrenal cortex and gonads — those are its targets, not fellow controllers.
- Q2 of 6Easy
Insulin lowers:
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Answer: Blood glucose
Explanation: Insulin, made by β-cells of the pancreas, lowers blood glucose by driving cellular uptake and glycogen storage — the opposite effect to glucagon from α-cells.
- Q3 of 6Medium
Angiotensinogen is produced by:
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Answer: Liver
Explanation: The liver continuously secretes angiotensinogen into blood; kidney-released renin then cleaves it to angiotensin I, starting the pressure-raising cascade.
- Q4 of 6Medium
The pars distalis of the pituitary is commonly called the:
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Answer: Anterior pituitary
Explanation: The pars distalis region of the pituitary, commonly called the anterior pituitary, produces GH, prolactin, TSH, ACTH, LH and FSH.
- Q5 of 6Hard
Most endocrine secretion is regulated by:
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Answer: Negative feedback loops
Explanation: Most endocrine axes use negative feedback: rising hormone levels suppress further release (e.g. T4 dampening TSH) — oxytocin in labour is the rare positive-feedback exception.
- Q6 of 6Hard
Iodine is essential for the synthesis of:
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Answer: Thyroxine (T4)
Explanation: Iodine is incorporated onto tyrosine residues in the thyroid to make T4 (thyroxine); insulin, adrenaline and testosterone contain no iodine at all.
Chemical Coordination and Integration notes: key concepts (Class 11 Biology)
Hormones are chemical messengers that coordinate the body over minutes to years. This chapter surveys the endocrine glands and their hormones, the hypothalamus–pituitary axis, the distinct membrane-receptor and intracellular-receptor mechanisms of hormone action, and the feedback loops that keep secretion in balance.
- Endocrine system
- Ductless endocrine glands pour hormones straight into the blood; unlike fast neural signals, hormonal coordination is slower but more sustained.
- Hypothalamus
- The hypothalamus is the master link: its releasing and inhibiting hormones govern the anterior pituitary, tying the nervous and endocrine systems together.
- Pituitary gland
- The anterior pituitary secretes GH, TSH, ACTH, LH, FSH and prolactin; the posterior lobe stores hypothalamic oxytocin and vasopressin (ADH).
- Growth hormone
- GH drives body growth; its excess causes gigantism or acromegaly and its deficiency dwarfism, showing that hormone dose matters.
- Thyroid
- The thyroid's thyroxine (T4/T3) needs iodine and sets the basal metabolic rate; its hormone calcitonin lowers blood calcium levels.
- Thyroid disorders
- Iodine-deficient goitre, hypothyroid cretinism and myxoedema, and hyperthyroid states all show thyroxine's wide metabolic reach.
- Parathyroid
- Parathyroid hormone raises blood calcium by acting on bone, kidney and gut — an antagonist to the thyroid's calcitonin.
- Adrenal medulla
- The adrenal medulla secretes adrenaline and noradrenaline — the fight-or-flight catecholamines that raise heart rate, alertness and blood glucose.
- Adrenal cortex
- The adrenal cortex makes glucocorticoids (cortisol, glucose metabolism) and mineralocorticoids (aldosterone, Na⁺ and water balance).
- Pancreatic islets
- The islets of Langerhans secrete insulin from β-cells (lowers blood glucose) and glucagon from α-cells (raises it) — an antagonistic pair.
- Diabetes mellitus
- Insulin deficiency or resistance causes diabetes mellitus, marked by hyperglycaemia and glucose in urine; it is distinct from ADH-linked insipidus.
- Gonads
- Testes secrete androgens (testosterone) for male traits and sperm; ovaries secrete oestrogen and progesterone for female traits and the menstrual cycle.
- Mechanism of hormone action
- Peptide and amino-acid hormones bind surface receptors and use second messengers like cyclic AMP; steroid and thyroid hormones enter cells to switch on genes.
- Feedback regulation
- Secretion is tuned mostly by negative feedback — a rising hormone or its product suppresses the releasing gland, stabilising hormone levels.
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Chemical Coordination and Integration — FAQs
What are the key concepts in Class 11 Biology Chemical Coordination and Integration?+
Hormones are chemical messengers that coordinate the body over minutes to years. This chapter surveys the endocrine glands and their hormones, the hypothalamus–pituitary axis, the distinct membrane-receptor and intracellular-receptor mechanisms of hormone action, and the feedback loops that keep secretion in balance. Key ideas include Endocrine system, Hypothalamus, Pituitary gland, Growth hormone, Thyroid, Thyroid disorders.
What does Class 11 Biology Chapter 19 (Chemical Coordination and Integration) cover on XamBaaz?+
It has 90 NCERT-based MCQs on "Chemical Coordination and Integration": 30 Easy, 30 Medium and 30 Hard. Together they make 9 timed quizzes, and you never get the same set twice. Every question has an instant explanation. They help you prepare for CBSE & Maharashtra HSC Board exams, MHT-CET and NEET UG.
Are these "Chemical Coordination and Integration" questions free to practise?+
Yes. Sign in with Google to practise "Chemical Coordination and Integration" free. Full unlimited access is ₹1,999/year. One year from the day you pay. You stay in Class 11 till 31 March; on 1 April your account moves up to Class 12 and the rest of your year carries over. No chapter is charged separately.
How should I revise "Chemical Coordination and Integration" for the exam?+
Start with the Easy quiz to check your basics, then try Medium and Hard to practise applying them. There are 9 timed quizzes on this chapter, so you can come back for a fresh set instead of one you have seen. Read each explanation, retry the questions you miss, and track your accuracy until it stays high.
Are these "Chemical Coordination and Integration" MCQs available with answers?+
Yes. 6 sample questions are on this page with answers: tap an option, or "Show answer", to see the correct option and a step-by-step explanation. Sign in free with Google to start practising, with instant scoring.
Is there negative marking in the "Chemical Coordination and Integration" quizzes?+
Yes. The timed quizzes use exam-style marking: +4 for a right answer, −1 for a wrong one and 0 for a skip, the same negative marking as NEET UG. MHT-CET and CBSE board papers have no negative marking. Our mocks for those are scored their way.
What are the important questions from Chemical Coordination and Integration (Class 11 Biology)?+
The questions that matter most test Endocrine system, Hypothalamus, Pituitary gland, Growth hormone, Thyroid, Thyroid disorders. This page shows 6 solved important MCQs with answers and explanations. Sign in to practise all 90 questions on the chapter as timed quizzes.
Is there an online quiz for Chemical Coordination and Integration?+
Yes — Class 11 Biology Chemical Coordination and Integration has timed online quizzes at Easy, Medium and Hard levels, with instant scoring and a worked explanation on every question. The first quiz on the chapter is free.
Are there question answers and extra questions for Chemical Coordination and Integration (Class 11 Biology)?+
Yes. This page has 6 solved questions on Chemical Coordination and Integration, each with the correct answer and a short explanation. Sign in to practise all 90 questions on the chapter as timed quizzes.