Chapter Exam

Chapter 19: Chemical Coordination and Integration — Online MCQ Test

Q: Which gland is often called the 'master gland' because it controls several other endocrine glands?

Answer: B. Pituitary gland — The pituitary gland secretes hormones that regulate the activity of other endocrine glands, so it is called the master gland.

Q: Which hormone regulates the level of glucose in blood by promoting the uptake of glucose by cells?

Answer: A. Insulin — Insulin lowers blood glucose by helping cells take up glucose and by promoting its storage as glycogen.

Q: Which hormone helps in the reabsorption of water by the kidney tubules?

Answer: A. ADH — Antidiuretic hormone (ADH) promotes water reabsorption in the kidneys, reducing urine volume.

Q: If the secretion of thyroid hormone is reduced for a long time in childhood, the most likely consequence is:

Answer: B. Cretinism — Hyposecretion of thyroxine during childhood leads to cretinism, characterized by stunted growth and mental retardation.

Q: Which of the following is the best answer for the fill-in-blank statement: '__________ is secreted by the adrenal medulla during emergency situations.'

Answer: B. Adrenaline — Adrenaline is secreted by the adrenal medulla during emergency or stress situations to prepare the body for fight-or-flight.

BIOLOGY · CLASS 11 FIRST PUC · Karnataka State Board

Practice Chapter 19: Chemical Coordination and Integration with a free chapter-wise online MCQ test for Karnataka State Board CLASS 11 FIRST PUC BIOLOGY. This chapter covers: Endocrine System Hormones Pituitary Thyroid Adrenal Pancreas Feedback Mechanism Hormonal Regulation Homeostasis. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 19: Chemical Coordination and Integration — Important Questions & Answers (FAQ)

Frequently asked questions from Karnataka State Board CLASS 11 FIRST PUC BIOLOGY — Chapter 19: Chemical Coordination and Integration, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which gland is often called the 'master gland' because it controls several other endocrine glands?

A. Thyroid gland
B. Pituitary gland ✓
C. Adrenal gland
D. Pancreas

Answer: B. Pituitary gland
The pituitary gland secretes hormones that regulate the activity of other endocrine glands, so it is called the master gland.

Which hormone regulates the level of glucose in blood by promoting the uptake of glucose by cells?

A. Insulin ✓
B. Thyroxine
C. Aldosterone
D. Adrenaline

Answer: A. Insulin
Insulin lowers blood glucose by helping cells take up glucose and by promoting its storage as glycogen.

Which hormone helps in the reabsorption of water by the kidney tubules?

A. ADH ✓
B. Insulin
C. Glucagon
D. Calcitonin

Answer: A. ADH
Antidiuretic hormone (ADH) promotes water reabsorption in the kidneys, reducing urine volume.

If the secretion of thyroid hormone is reduced for a long time in childhood, the most likely consequence is:

A. Gigantism
B. Cretinism ✓
C. Diabetes mellitus
D. Acromegaly

Answer: B. Cretinism
Hyposecretion of thyroxine during childhood leads to cretinism, characterized by stunted growth and mental retardation.

Which of the following is the best answer for the fill-in-blank statement: '__________ is secreted by the adrenal medulla during emergency situations.'

A. Thyroxine
B. Adrenaline ✓
C. Insulin
D. Progesterone

Answer: B. Adrenaline
Adrenaline is secreted by the adrenal medulla during emergency or stress situations to prepare the body for fight-or-flight.