Focus Area 2021 | Questions and Answers | Plus One Zoology | Chemical Coordination and Integration

CHEMICAL COORDINATION AND INTEGRATION

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

Gland	Hormones	Function
(A) ............	Androgens	Development of male accessory sex organs
Adrenal medulla	(B) ..............	(C) ................
(D) ............	Glucagon	Maintains normal blood glucose levels
Pineal	(E) ..............	(F) ..................

Answer:

(A) Testis

(B) Adrenalin & Noradrenalin

(C) Response to stress emergency situations (Hormones of fight or flight).

(D)  Pancreas

(E) Melatonin

(F) Regulates diurnal (24-hour) rhythm.

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

Answer:

Hypothalamus and pituitary.

A= Hypothalamus                   

B= Posterior Pituitary

C= Anterior pituitary               

D= Portal circulation

3. 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

4. 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 produces the hormone?

c.  To which organ, this endocrine gland is attached?

Answer:

(a) Adrenalin and Noradrenalin.

(b) Adrenal gland.

(c) Kidney.

5. The functions of certain hormones are given below. Identify the hormone. (Score 2)
    (a) Regulation of Basal Metabolic Rate (BMR).
    (b) Contracts smooth muscles.
    (c) Lower blood sugar level.
    (d) Support pregnancy and act on the mammary gland.

Answer:

(a) Thyroxin              

(b) Oxytocin

(c) Insulin                  

(d) Progesterone

6. Expand the following hormones: (Score 2)
    a) TSH 

    b) PTH 

    c) ANF 

    d) FSH

Answer:

(a) Thyroid Stimulating Hormone/

(b) Parathyroid hormone.

(c) Atrial Natriuretic Factor.

(d) Follicle Stimulating Hormone.

7. Complete the table. (Score 2)

Endocrine gland	Hormone	Functions
Heart	…..(A)….	Decreases blood pressure
Pancreas	Insulin	……(B)……
....(C)….	Erythropoietin	Stimulates erythropoiesis
Thyroid	...(D)…	Lowers blood calcium level

   

      Answer:

A= ANF                     B= Decreases blood sugar

C= JGA                      D= Thyrocalcitonin (TCT)

8. Hormonal abnormality is responsible for certain diseases in men. A list of some diseases is given below. Write the hormone related to each of them. (Score 2)

a.  Diabetes mellitus           

b.  Gigantism

c.  Diabetes insipidus         

d.  Cretinism

    Answer:

    (a) Insulin                  

    (b)  Somatotrophin (GH)

    (c) ADH                     

    (d) Thyroxine

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

Answer:

Insulin lowers blood glucose level and Glucagon increases blood glucose level. Thus they are antagonistic in action.

Similarly, calcitonin (TCT) lowers blood calcium level and PTH increases blood calcium level. Thus they are also antagonistic in action.

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