NCERT Class 11-Biology: Chapter –22 Chemical Coordination and Integration Part 4

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Question 10:

Correct the following statements by replacing the term underlined.

a. Insulin is a steroid hormone.

b. TSH is secreted from the corpus luteum

c. Tetraiodothyronine is an emergency hormone.

d. The pineal gland is located on the anterior part of the kidney.

Answer:

  • Insulin is a protein hormone.

  • TSH is secreted from the anterior pituitary.

  • Adrenaline is an emergency hormone.

  • Adrenal gland is located on the anterior part of the kidney.

Question 11:

Rearrange the following hormones in Column I so as to match with their chemical nature in Column II.

Chapter 22- Question 11 - Table of the Choose the Correct Answer
Chapter 22- Question 11 - Table of the Choose the Correct Answer

Column I

Column II

a.

Oxytocin

i.

Aminoacid derivative ( )

b.

Epinephrine

ii.

Steroid ( )

c.

Progesterone

iii.

Protein ( )

d.

Growth hormone

iv.

Peptide ( )

Answer:

(a) (iii), (b) (i), (c) (ii), (d) (iv)

Short Answer Type Questions

Question 1:

What is the role-played by luteinizing hormones in males and females respectively?

Answer:

  • In males, LH stimulates the synthesis and secretion of hormone called Androgen from Testes. The principal of androgen is testosterone which stimulates the spermatogenesis and responsible for the growth and development of male accessory sex organs. Which stimulates

    • Muscle growth

    • Growth of facial hair

    • Axillary hair

    • Aggressiveness

    • Low pitch of voice

    • Bone growth

    • Muscle growth

  • In females LH induce ovulation, on the day of ovulation follicle repture and release secondary oocyte under the influence of LH. LH promotes the development of corpus luteum.

Question 2:

What is the role of second messenger in hormone action?

Answer:

Hormone which have to interact with membrane bound receptor, do not bind itself for that it require secondary messenger like (CAMP) which act as intracellular hormonal mediator which diliver the information inside the target cell. It activate the appropriate cellular enzyme system where the specific hormone stimulated responses takes place. Secondary messenger are CAMP, CGMP, diacyglycerol, inositol triphosphate, phospoinositides, calcium etc.

Question 3:

On an educational trip to Uttaranchal, Ketki and her friends observe that many local people were having swollen necks. Please help Ketki and her friends to find out the solutions to the following questions.

a. Which probable disease are these people suffering from?

b. How is it caused?

c. What effect does this condition have on pregnancy?

Answer:

(a) Goiter

Reason: when thyroid gland is enlarged it causes diseases Goiter which is due to overstimulation of thyroid gland. When thyroid gland stimulates excessive thyroid hormone that is TSH or TSI than it causes Goiter.

(b) It is caused due to the deficiency of iodine in the diet that results in hyperthyroidism and enlargement of the thyroid gland commonly called Goiter in which thyroid hormone form excessively.

(c) Hypothyroidism during pregnancy causes-

Defective development and maturation of the growing baby leads to stunted growth (cretinism)

Mental retardation

Low intelligence quotient

Question 4:

George comes on a vacation to India from US. The long journey disturbs his biological system and he suffers from jet lag. What is the cause of his discomfort?

Answer:

Jet lag is a temporary sleep disorder among air travellers who rapidly travel across time zones. Jet lag occurs as a result of the slow adjustment of the body clock to the destination time. Melatonin is a hormone which is responsible for sleep-wake- cycle which is secreted by pineal gland and are stimulated by darkness and suppressed by light. Melatonin secretion increases up to 10-fold during the darkness of night and then fall to low levels during the light of day. Melatonin levels are higher in children and decline with age in adult. So melatonin is the hormone which is responsible for this biological system discomfort.

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