Question 7
Which of the following hormone regulates the amount of glucose in the blood?
- growth hormone
- insulin
- adrenaline
- auxin
insulin
Reason — Insulin converts extra glucose of blood into glycogen which is stored in liver.
Key Concepts Covered
This question tests your understanding of the following concepts from the chapter Endocrine System in Humans: Question, Hormone, Regulates, Amount, Glucose, Blood. These are fundamental topics in Biology that students are expected to master as part of the ICSE Class 8 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 Question
Read 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 Remember
- Use 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.
Practice more questions from Endocrine System in Humans — Biology, Class 8 ICSE
Endocrine System – Interactive Study Guide
The endocrine system consists of ductless glands that secrete hormones into the blood. Hormones are chemical messengers that regulate growth, metabolism, reproduction, and response to stress.
Endocrine vs Exocrine at a Glance
| Feature | Endocrine | Exocrine |
|---|---|---|
| Ducts | Ductless | Have ducts |
| Secretion | Hormones (into blood) | Enzymes, sweat (through ducts) |
| Examples | Pituitary, thyroid, adrenal | Salivary, sweat, liver |
Master Table: Glands, Hormones, Functions
| Gland | Hormone | Function | Disorder |
|---|---|---|---|
| Pituitary | GH | Growth | Dwarfism / Gigantism |
| Thyroid | Thyroxine | Metabolism (needs iodine) | Goitre / Cretinism |
| Parathyroid | Parathormone | Calcium regulation | Tetany |
| Adrenal | Adrenaline | Fight-or-flight | Addison's disease |
| Pancreas | Insulin / Glucagon | Blood sugar regulation | Diabetes mellitus |
| Testes | Testosterone | Male characters | — |
| Ovaries | Oestrogen | Female characters | — |
Feedback Mechanism
High hormone level → Gland reduces production. Low hormone level → Gland increases production.
Example: High blood sugar → Insulin released → Sugar absorbed by cells → Sugar drops → Insulin production stops.
Self-Test Questions
- Why is the pituitary gland called the master gland?
- What is goitre? How can it be prevented?
- Differentiate between insulin and glucagon.
- What happens during a fight-or-flight response?
- Explain the feedback mechanism with the example of blood sugar.