NEET · Biology · Class 11Chemical Coordination and Integration — NEET Biology MCQs
30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.
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Sample questions from this chapter
A trace chemical is released by one cell group and changes the activity of receptor-bearing cells elsewhere without serving as a nutrient. How is it best described?
- An intercellular messenger hormone ✓
- A digestive enzyme
- A structural protein
- A mineral nutrient
Answer: A. Hormones are non-nutrient chemicals produced in trace amounts that act as intercellular messengers. The definition includes signalling from diffuse tissues, not just classic ductless glands.
Why not B: Enzymes catalyse reactions, often in digestive secretions, rather than being defined by trace intercellular signalling.
Why not C: Structural proteins support cells or tissues and are not released chiefly to regulate receptor-bearing targets.
Why not D: A nutrient supplies material or energy, whereas hormones are specifically non-nutrient messengers.
An adult has protruding eyes, weight loss and an increased basal metabolic rate despite adequate food intake. Which hormonal state is most consistent?
- Hypoparathyroidism
- Growth-hormone deficiency
- Hyperthyroidism characteristic of Graves' disease ✓
- Reduced adrenal-medullary secretion
Answer: C. Exophthalmic goitre combines thyroid enlargement, protruding eyes, high BMR and weight loss from excess thyroid hormone. Weight loss alone could suggest other catabolic states, but exophthalmos makes Graves' disease specific.
Why not A: Low PTH primarily disturbs calcium regulation and can increase neuromuscular excitability.
Why not B: GH deficiency in childhood causes stunted growth and does not produce the stated adult metabolic syndrome.
Why not D: Reduced catecholamines would not explain chronic thyroid enlargement with exophthalmos and high BMR.
Two hormones reach a cell: insulin is a peptide, while cortisol is a steroid. Which signalling contrast is expected?
- Insulin uses a membrane receptor and second messengers; cortisol binds an intracellular receptor that can alter gene expression ✓
- Insulin crosses the lipid bilayer to bind chromosomal DNA, while cortisol remains extracellular
- Both enter the nucleus directly because blood carries them
- Cortisol uses a membrane receptor because steroids dissolve poorly in lipids
Answer: A. Peptide hormones generally signal through membrane-bound receptors and cAMP, IP₃ or Ca²⁺, whereas steroids form intracellular complexes that regulate genome activity. Receptor location follows solubility and chemical class.
Why not B: This reverses the usual receptor locations for peptide and steroid hormones.
Why not C: Chemical nature, not common transport in blood, determines whether free hormone can cross the membrane and where receptors lie.
Why not D: Steroids are lipid-soluble and therefore can access intracellular receptors.
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Questions
How many NEET questions are there on Chemical Coordination and Integration?
This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 11 chapter.
Is this NEET Biology chapter test free?
Yes. Every chapter test is free with no login. The only paid thing on the site is the full-length 90-question Biology mock and its all-India rank.
Do the questions explain the wrong options?
Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.