NCERT Class 11 Chapter 22 Biology Chemical Coordination and Integration MCQ

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1. Chemically hormones are

A. proteins, steroids and biogenic amines

B. proteins only

C. steroids only

D. biogenic amines only

2. The blood calcium level is lowered by the deficiency of

A. parathormone

B. thyroxine

C. both calcitonin and parathormone

D. calcitonin

3. The technique used for estimation of minute amounts of hormones and drugs is called

A. radioimmunoassay

B. electroencephalogram

C. fractionation

D. None of these

4. Testosterone is produced by

A. Leydig's cells

B. pituitary gland

C. Both

D. None of these

5. Which one of the following is not a second messenger in hormone action ?

A. Sodium

B. cGMP

C. Calcium

D. cAMP

6. The phase of menstrual cycle in humans that lasts for 7-8 days, is

A. ovulatory phase

B. menstruation

C. luteal phase

D. follicular phase

7. Blood glucose level in man is regulated by

A. glucagon and insulin

B. All of the above

C. adrenaline

D. insulin

8. Which of the following glands grows to the maximum size at puberty and then diminishes gradually?

A. Thymus

B. Thyroid

C. Pituitary

D. Adrenal

9. Hypoglycemic hormone is

A. Insulin

B. Thyroxine

C. Glucagon

D. Calcitonin

10. Which hormone interacts with membrane bound receptor and does not normally enter the target cell ?

A. Follicle-stimulating hormone

B. Estrogen

C. Thyroxin

D. Cortisol

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11. The 24 hour (diurnal) rhythm of our body such as the sleepwake cycle is regulated by the hormone

A. Melatonin

B. Prolactin

C. Adrenaline

D. Calcitonin

12. Steroid hormones transmit their information by

A. the help of an intracellular second messenger

B. entering into the cell and modifying nuclear organization

C. entering into the cell and modifying cellular contents

D. timulating the receptors present on cell membrance

13. Increase in bleeding time and delay in blood coagulation is due to the deficiency of which hormone?

A. Parathormone

B. Adrenaline

C. Noradrenaline

D. Thyroxine

14. Estrogen and testosterone are steroid hormones, and most likely bind to

A. cytoplasmic receptors

B. G-protein coupled membrane receptors

C. enzyme-linked membrane reseptors

D. membrane ion channels

15. The only unicellular exocrine glands in our body are

A. Mucus secreting goblet cells

B. Mammary glands

C. Sebaceous glands

D. Sweat glands

16. Steroid-based hormones are able to act inside the cell. This is possible because

A. steroid-based hormones are hydrophobic molecules that can pass through the cell membrane

B. proteins carry them into the cell.

C. hormones must interact with the nucleus to have an effect

D. there are no receptors for hormones on the cell surface

17. Target cells

A. Both

B. react specifically to a chemical messenger

C. react specifically to a chemical messenger

D. None of these

18. Researchers have found increased levels of hormones from the _____ in the blood of students preparing for final exams. These hormones are produced in response to stress

A. adrenal glands

B. pineal gland

C. thyroid gland

D. posterior pituitary

19. Hormones generally cause a response in a cell by

A. binding with a receptor and stimulating protein production

B. changing the polarity of the cell membrane and causing a cascade of events within the cell.

C. halting all other cellular activity except the required response

D. interacting directly with the cell’s DNA

20. Hormones are produced at a particular centralized site and transported throughout the organism by means of

A. an internal transport system

B. cellular communication

C. an integrated neural pathway system

D. a series of synapses

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21. Insulin is

A. vitamin

B. lipid

C. hormone

D. enzyme

22. Addition of a trace of thyroxine or iodine in water containing tadpoles will

A. keep them in larval stage

B. hasten their metamorphosis

C. slow down their metamorphosis

D. kill the tadpoles

23. ADH or vasopressin is

A. enzyme that hydrolyses peptides

B. hormone secreted by pituitary that promotes reabsorption of water from glomerular filtrate

C. hormone that promotes glycogenolysis

D. energy rich compound connected with muscle contraction

24. Gastric secretion is stopped by hormone

A. enterogesterone

B. gastrin

C. pancryeozymin

D. cholecystokinin

25. According to the accepted concept of hormone action, if receptor molecules are removed from target organs, then the target organ will

A. not respond to the hormone

B. continue to respond to hormone without any difference

C. continue to respond to the hormone but in the opposite way

D. continue to respond to the hormone but will require higher concentration