Thursday, October 29, 2020

2019 JULY Improvement | HSE +1 Exam | Zoology Question Paper

2019 JULY Improvement (+1) 
PART A: ZOOLOGY 


Answer all questions from 1 to 3. Each carries 1 Score. (3 X 1 = 3)

1. Unlike bony fishes, cartilage fishes are swim constantly to avoid sinking due to the

a. Presence of pharyngeal gill slits
b. Presence of air bladder
c. Absence of pharyngeal gill slits
d. Absence of air bladder

2. ..................... is the taxonomical aid based on contrasting characters generally in a pair called couplet.

3. Which of the part of brain control respiration and gastric secretions?

a. Cerebrum
b. Medulla
c. Cerebellum
d. Hypothalamus

Answer any 9 questions from 4 to 14. Each carries 2 Score. (9 X 2 = 18)

4. Major steps involved in muscle contraction are given below, which are not in the correct order. Arrange them in the correct order.

a. Remove the mask of active sites for binding myosin 
↓ 
b. A signal sent out by CNS 
↓ 
c. Binding of Ca2+ with troponin 
↓ 
d. Release of a neuro-transmitter substance 
↓ 
e. Release of Ca2+ into the sarcoplasm 

5. Observe the diagram showing transverse section of human gut:


a. Label A, B, c, D
b. Write any two structural modifications of mucosa at parts of gut.

6. List the major factors affecting the dissociation of oxygen from oxyhaemoglobin in the tissues.

7. (a) Identify the tissues based on the features given below:

i. Intercalated disc.
ii. Involuntary in action

    (b) Mention the function of intercalated disc.

8. State whether the following statements are true/false. If false, correct it.

a. ADH prevents diuresis.
b. ANF causes the increase of blood pressure.
c. Angiotensin-l activate adrenal cortex to release aldosterone.
d. Aldosterone causes the reabsorption of Na+ and water from the distal part of renal tubule.

9. Name of the bones of appendicular skeleton are given below:

Clavicle, Humerus, Tibia, Patella 

a. Select the bones of pectoral girdle.
b. Name the articulating cavity between femur and pelvic girdle.

10. Identify the function of the following structures of cockroaches:

a. Compound eye
b. Seminal vesicle
c. Arthrodial membrane
d. Malpighian tubules

11. The following are organs of certain animals:

Parapodia
Flame cells
Proboscis gland
Comb plates

a. Select organs helps in excretion.
b. Name the organism bearing these organs and its phylum.

12. Distinguish between the following:

a. Electric synapse and Chemical synapse
b. Rods and cones.

13. Identify the picture and label the parts A, B, C, D.


14. (a) Make a flowchart showing cardiac impulse conduction using appropriate terms given in bracket.

[SAN, Right atrium, AVN, AV Bundle, Bundle of His, Ventricle] 

      (b) Which part known as pacemaker?

Answer any 3 questions from 15 to 18. Each carries 3 Score. (3 X 3 = 9)

15. Complete the Schematic diagram.


16. Following are the hormones produced by tissues other than endocrine glands. Write the part where it is produced and mention the function of each.

a. Cholecystokinin
b. Gastrin
c. Secretin

17. Match the following:

Classification of Enzymes

Reactions

A

B

Hydrolases

Oxidation-reduction reactions

Lyases

Linking together of molecules

Oxidoreductases

Transfer of a group

Isomerases

Interconversion of molecules

Ligases

Removal of groups

Transferases

Hydrolysis of bonds


18. Blood coagulation is a mechanism to prevent the excessive loss of blood.

a. Identify the enzyme help the conversion of inactive fibrinogen.
b. Mention the role of thrombokinase.
c. Which ion is necessary for blood clotting?

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