Tag: biology

Questions Related to biology

Which of these properties are not present in hormones?

biology the endocrine system hormones coordination in human beings- chemical control endocrine system in humans

  1. They can easily diffuse through membranes.

  2. They are specific in their action.

  3. They are never stored in body and synthesized at once.

  4. They have a high molecular weight and not found in plants.

Show answer
Correct Option: D
Explanation:

  • A hormone may be defined as a specific product (organic substance) of an endocrine gland secreted into the blood which carries it to a specific part of the body where it produces a definite physiological effect. 
  • Hormones exert their effects not where they are locally produced, but on other tissues of the body. And never stored in the body and synthesized at once.  Hence,  They have a high molecular weight and not found in plants is not the property of hormones.
 So, the correct answer is 'They have a high molecular weight and not found in plants'.

Hormones affect distant cells by controlling .......... proteins.

biology the endocrine system hormones coordination in human beings- chemical control endocrine system in humans

  1. Acceptor

  2. Receptor

  3. Basic

  4. None of the above

Show answer
Correct Option: B
Explanation:

  • A hormone receptor is a receptor molecule that binds to a specific hormone.
  • Hormone receptors are a wide family of proteins made up of receptors for thyroid and steroid hormones, retinoids and Vitamin D, and a variety of other receptors for various ligands, such as fatty acids and prostaglandins. Hence, Hormones affect distant cells by controlling Receptor proteins.  
 So, the correct answer is 'Receptor'.

A hormonal controls is ________

biology the endocrine system hormones coordination in human beings- chemical control endocrine system in humans

  1. Voluntary

  2. Involuntary

  3. Voluntary and involuntary both

  4. None of the above

Show answer
Correct Option: B
Explanation:

A hormonal control is always involuntary. We cannot control its action by our wish. Eg$:$ Growth of height of an individual.

FSH and LH hormones together are called

biology the endocrine system hormones coordination in human beings- chemical control endocrine system in humans

  1. Emergency hormones

  2. Gonadotropic hormones

  3. Neurohormones

  4. Outstress hormones

Show answer
Correct Option: B
Explanation:

FSH and LH are collectively known as gonadotropic hormone because they regulate the growth and functioning of gonads.

Which of the following hormones is known to have calorigenic effect?

biology the endocrine system hormones coordination in human beings- chemical control endocrine system in humans

  1. $T _1$ & $T _1$

  2. TCT

  3. PTH

  4. Calcitriol

Show answer
Correct Option: A
Explanation:

The calorigenic effect is a result of the increased metabolic rate and increased oxygen consumption by cells. When the metabolic rate increases, more heat is generated.T1 and T1 are hormones that have a calorigenic effect.

So, the correct option is 'T1 and T1'.

The secretion of following anterior pituitary hormones is controlled by hypothalamus

biology the endocrine system hormones coordination in human beings- chemical control endocrine system in humans

  1. Thyrotropin (TSH) and cortisol

  2. Follicle stimulating hormone (FSH) and progesterone

  3. Corticotropin (ACTH), growth hormone and

    vasopressin

  4. Luteinizing hormone (LH), corticotropin (ACTH) and

    thyrotropin (TSH)

Show answer
Correct Option: D
Explanation:

Hypothalamus secretes both releasing and inhibitory hormones controlling the secretion of some anterior pituitary hormones(LH, ACTH, and TSH etc.)

Which group of hormones is natural?

biology the endocrine system hormones coordination in human beings- chemical control endocrine system in humans

  1. IAA, IBA, NAA

  2. IAA, $GA _3$, ABA

  3. $2, 4$-D, Kinetin, ABA

  4. $GA _3$, Zeatin, NAA

Show answer
Correct Option: B

Hormones are called chemical signals that stimulate specific target tissues. Which is the correct location of these receptors in case of protein hormones?

biology the endocrine system hormones coordination in human beings- chemical control endocrine system in humans

  1. Extracellular matrix

  2. Blood

  3. Plasma membrane

  4. Nucleus

Show answer
Correct Option: C
Explanation:

Hormones of protein nature binds to specific receptor molecules located on the plasma membrane to form the hormone receptor complex.

Hormone produced due to the effect of dietary lipids in the chyme, causes.

biology the endocrine system hormones coordination in human beings- chemical control endocrine system in humans

  1. Relaxation of gall bladder

  2. Secretion of water, bicarbonate ions

  3. Inhibits gastro intestinal motility

  4. Constraction of sphincter of Oddi

Show answer
Correct Option: A

Which of these functions hormones perform in our body?

biology the endocrine system hormones coordination in human beings- chemical control endocrine system in humans

  1. Regulation of cellular activities and influencing growth

  2. Regulation of intermediary metabolism

  3. Maintenance of homoeostasis

  4. All of the above

Show answer
Correct Option: D
Explanation:

  • The functions of Hormones are : 
1. Hormones are produced by a specialized gland and are secreted directly into the bloodstream.
 2. Hormones are transported by the bloodstream from the endocrine cells to serve as ‘chemi­cal messenger’ which act on target cells or organs by regulating the rates of specific metabolic reactions. 
3. Hormones exert their effects not where they are locally produced, but on other tissues of the body. 
4. Hormones are required in very small amounts and their effect may be excitatory or inhibitory depending upon their concentration and the physiological state of the responding tissue. Hence, Regulation of cellular activities and influencing growth, Regulation of intermediary metabolism and Maintenance of homoeostasis are the functions hormones perform in our body. 
So, the correct answer is 'All of the above'.