Friday, April 22, 2022

Chemical coordination and Integration | Class 11 | Previous Years Questions and Answers (2015 to 2020)

 CHEMICAL COORDINATION AND INTEGRATION


2020 MARCH


1.   ‘Adrenal medulla is the centrally located tissue in the adrenal gland, whereas adrenal cortex is located outside.’
How do adrenal cortex and medulla differ in their function?
(Score 2)


Answer:

Adrenal cortex secretes steroid hormones such as cortisol, aldosterone, sex corticoid etc.

Adrenal medulla secretes emergency hormones (Adrenalin and noradrenalin).


2.  Complete the given table appropriately. (Score 3)


Gland

Hormones

Function

    i.   (A) ............

Androgens

Development of male accessory sex organs

  ii.   Thymus

(B) ...............

(C) ..................

 iii.   (D) ............

Glucagon

Maintains normal blood glucose levels

 iv.   Pineal

(E) ...............

(F) ...................

 

Answer:

(A) Testis

(B) Thymosins

(C) Gives immunity

(D) Pancreas (Islets of Langerhans)

(E) Melatonin

(F) 24-hr diurnal rhythm


2019 JULY


1. Identify the picture and label the parts A, B, C, D. (Score 2)


Answer:

The picture is Hypothalamus and Pituitary.

(A) Hypothalamus

(B) Posterior pituitary

(C) Anterior pituitary

(D) Portal circulation


2.   Following are the hormones-produced by tissues other part than endocrine glands. Write where it is produced and mention the functions of each. (Score 3)
(a) Cholecystokinin
(b) Gastrin

(c) Secretin


Answer:

They are secreted from Gastro-intestinal tract.

a.  Cholecystokinin: Stimulates secretion of bile from gall bladder and pancreatic enzymes from pancreas.

b.  Gastrin: Stimulates gastric glands to secrete HCl and pepsinogen.

c.  Secretin: Stimulates exocrine pancreas to secrete water and bicarbonate ions.


2019 MARCH


1.   Note the relationship in the first pair and then complete the second pair. (Score 2)

a.   Insulin: Hypoglycaemic hormone                                

    ......................: Hyperglycaemic hormone.

b.   Over secretion of Growth hormone: Gigantism

Low secretion of Growth hormone: .......................


Answer:

(a) Glucagon              (b) Dwarfism


2019 MODEL


1.  Anitha saw a poisonous snake on her way to school, she was frightened and her heart and breathing rate increased: (Score 2)
(a) Name the hormones which are dominant at that time in her blood.
(b) Which endocrine gland produce the hormone?
(c) To which organ this endocrine gland is attached?


Answer:

(a) Adrenalin and noradrenalin

(b) Adrenal gland (adrenal medulla)

(c) Kidney


2.  Functions of certain hormones are given below.
Identify the hormone.
(Score 2)

(a) Regulation of metabolism

(b) Differentiation of 'T' cells

(c) Lower blood sugar

(d) Support pregnancy and act on mammary gland.


Answer:

(a) Thyroxin

(b) Thymosins

(c) Insulin

(d) Progesterone


2018 AUGUST


1.  Expand the following hormones: (Score 2)

a) TSH         b) ACTH       c) ANF          d) FSH


Answer:

(a) Thyroid Stimulating Hormone

(b) Adrenocorticotrophic Hormone

(c) Atrial Natriuretic Factor

(d) Follicle Stimulating Hormone


2.  Name the hormones whose deficiency is responsible for the following:
a) Dwarfism                       b) diabetes mellitus

c) Cretinism                       d) Diuresis


Answer:

(a) Somatotropin (GH)

(b) Insulin

(c) Thyroxin

(d) ADH (Vasopressin)


3. Complete the table given below by using appropriate terms. (Score 3)

Gland

Hormone

Function

Pancreas

Glucagon

…..(a)…..

…..(b)…..

Thymosin

Immunity

Pineal gland

…..(c)…..

24-hr diurnal rhythm

Pituitary gland

Oxytocin

…..(d)…..

…..(e)…..

Parathyroid hormone

Increases Ca2+ level in blood

Thyroid

TCT/ Thyrocalcitonin

…..(f)…..


Answer:

(a) Increases blood glucose level

(b) Thymus

(c) Melatonin

(d) Contraction of smooth muscles

(e) Parathyroid gland

(f) Decreases Ca2+ level in blood


2017 MARCH


1. Complete the table. (Score 2)

Endocrine gland

Hormone

Functions

Heart

.…..(A)……

Decreases blood pressure

Pancreas

Insulin

………(B)………

…..(C)…..

Erythropoietin

Stimulates erythropoiesis

Thymus

……..(D)……

Gives immunity


Answer:

(A) ANF (Atrial Natriuretic Factor)

(B) Decreases blood glucose level

(C) JGA in kidney

(D) Thymosins      

                                

2016 MARCH


1.   Hormonal abnormality is responsible for certain diseases in man. List of some diseases are given below. Write the hormone related to each of it. (Score 2)

a)       Diabetes mellitus             b)  Gigantism

c)       Diabetes insipidus           d)  Cretinism

Answer:

(a) Insulin

(b) Somatotropin (GH)

(c) Antidiuretic hormone (ADH)

(d) Thyroxin

OR

Like insulin and glucagon, PTH and calcitonin are antagonistic in their action in maintaining normal blood calcium level. Substantiate this statement. (Score 2)


Answer:

This statement is true. Insulin and glucagon are antagonistic in their action because Insulin lowers glucose level in blood whereas glucagon rises blood glucose level. Thus blood glucose level is balanced.

In the same way, PTH and calcitonin are antagonistic in their action because PTH rises blood calcium level and calcitonin lowers blood calcium level. Thus normal blood calcium level is maintained.


2015 SEPTEMBER (IMPROVEMENT)


1.  Write any two examples for the following. (Score 2)

a.      Hormones which control blood-sugar level.

b.     Hormones which control sexual development.


Answer:

(a) Glucagon and Insulin.

(b) Androgen and Oestrogens.


2015 MARCH


1.  Match columns B and C with column A. (Score 2)


A

B

C

Thyroid

Insulin

Weak immunity

Pituitary

Thymosin

Gigantism

Pancreas

Growth hormone

Diabetes mellitus

Thymus

Thyroxin

Goitre

 

Answer:

              A

B

C

Thyroid

Thyroxin

Goitre

Pituitary

Growth hormone

Gigantism

Pancreas

Insulin

Diabetes mellitus

Thymus

Thymosin

Weak immunity

No comments:

Post a Comment