• Chemical Coordination and Integration (Class - XI)
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Chemical Coordination and Integration (Class - XI)

Description: Chemical Coordination and Integration (Class - XI)
Number of Questions: 15
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Tags: Chemical Coordination and Integration (Class - XI) Pancreatic Gland Human Endocrine System Skin Receptors Sensory Reception and Processing Adrenal Gland The Pituitary Gland Mechanism of Hormone Action Hormones Endocrine Glands and Hormones
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Which of the following characterises melanin?

  1. It enhances the penetration of UV radiation through the skin.

  2. Skin may vary frequently in the amount of melanin it contains.

  3. Individuals with high concentration of melanin in their skin are at a greater risk for skin cancer.

  4. It enhances the penetration of infrared radiation through the skin.

Show answer
Correct Option: B
Explanation:

Ultraviolet radiation from the Sun stimulates melanocytes in the skin to produce more melanin, which in turn makes the skin browner. This seasonal tanning is most noticeable among light complexioned people. It has the effect of shielding the inner skin.

The parathyroid hormone does not regulate the concentration of ________ ions in the urine.

  1. phosphate

  2. magnesium

  3. sodium

  4. bicarbonate

Show answer
Correct Option: D
Explanation:

Concentration of bicarbonate ions is not controlled by PTH. Its concentration depends on the buffering capacity of blood in the form of carbonate bicarbonate buffer

Hürthle cell is associated with

  1. thyroid gland

  2. pituitary gland

  3. adrenal gland

  4. pancreas

Show answer
Correct Option: A
Explanation:

Hürthle cell is associated with thyroid gland. Hürthle cell is used only to indicate cells of thyroid follicular origin.

Directions: The following question has four choices, out of which ONLY ONE is correct.

Gloger's rule states that

  1. there should be a purposeless distribution of people around the world who have low concentrations of skin pigmentation

  2. dark skin has a benefit for the people who live in far north latitudes

  3. dark skin has a benefit for the people who live in far south latitudes

  4. in series of generations, natural selection contributes for changes in human skin colour

Show answer
Correct Option: D
Explanation:

There is a selective advantage for people with dark complexions in regions of intense solar radiation.  

Which of the following hormones is catabolic in action?

  1. Adrenalin

  2. Insulin

  3. Glucagon

  4. Oxytocin

Show answer
Correct Option: C
Explanation:

Glucagon is a catabolic hormone as it converts glycogen to glucose.

Which of the following is a neurohormone?

  1. Insulin

  2. Glucagon

  3. Testosterone

  4. Oxytocin

Show answer
Correct Option: D
Explanation:

Oxytocin is a neurohormone secreted by hypothalamus.

What is the sequence of zones in the adrenal cortex?

  1. Zona fasciculata - Zona glomerulosa - Zona reticularis

  2. Zona reticularis - Zona fasciculata - Zona glomerulosa

  3. Zona glomerulosa - Zona fasciculata - Zona reticularis

  4. Zona reticularis - Zona glomerulosa - Zona fasciculata

Show answer
Correct Option: C
Explanation:

This is the correct sequence.

Which of the following hormones is known as the life saving hormone?

  1. Corticosterone

  2. Noradrenalin

  3. Estrogen

  4. Aldosterone

Show answer
Correct Option: D
Explanation:

Aldosterone is called the life saving hormone as its administration can prevent death due to hyposecretion of mineralocorticosteroids.

Where are chromaffin cells present?

  1. Adrenal cortex

  2. Adrenal medulla

  3. Islets of Langerhans

  4. Pituitary gland

Show answer
Correct Option: B
Explanation:

Chromaffin cells are hormone-producing cells of the adrenal medulla.

Hypertension, hyperglycemia, nervousness, sweating and complete exhaustion are the symptoms observed in

  1. hyper-secretion of corticosteroids

  2. hyper-secretion of epinephrine and nor-epinephrine

  3. hyposecretion of glucocorticoids

  4. hyper-secretion of parathyroid gland

Show answer
Correct Option: B
Explanation:

Hypertension, hyperglycemia, nervousness, sweating and complete exhaustion may occur due to hyper-secretion of epinephrine and nor-epinephrine.

How are hormones released into blood?

  1. By osmosis

  2. By diffusion

  3. Through ducts

  4. By active transport

Show answer
Correct Option: B
Explanation:

Hormones are small molecules which directly diffuse into the blood.

What is the similarity between enzymes and hormones?

  1. They are similar with respect to their chemical composition.

  2. They are similar with respect to their molecular weight.

  3. They are similar with respect to the way they participate in a reaction.

  4. They are both effective in low concentration.

Show answer
Correct Option: D
Explanation:

They are both effective in low concentration.

Who among the following discovered hormones?

  1. Kochar

  2. Raynard

  3. Bayliss and Starling

  4. Eustachius

Show answer
Correct Option: C
Explanation:

They discovered the first hormone called 'secretin'.

Which of the following is a steroid hormone?

  1. Insulin

  2. Oxytocin

  3. Estrogen

  4. Thyroxine

Show answer
Correct Option: C
Explanation:

Estrogen is a steroid hormone.

Match the following:

 
Diseases Hormones involved
a. Grave's disease 1. Aldosterone hormone
b. Addison's disease 2. Insulin hormone
c. Diabetes mellitus 3. Thyroid hormone

  1. a - 3, b - 2, c - 1

  2. a - 3, b - 1, c - 2

  3. a - 1, b - 3, c - 2

  4. a - 1, b - 2, c - 3

  5. a - 2, b - 1, c - 3

Show answer
Correct Option: B
Explanation:

This is the correct option. 

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