Past Paper 2025 12th Class Karachi Board Zoology Subjective (Science Pre-Medical Group)

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SECTION “B” (Short Answer Question) Marks: 18

NOTE: Attempt any NINE part questions in all. Select FIVE Reasoning Questions and FOUR Non-Reasoning Questions. All part questions carry equal marks.

Note: Answer any Nine part questions in all. Select five Reasoning Questions and four Non-Reasoning Questions. All part questions carry equal marks.

2. (a) REASONING QUESTION:

i) Why calcium is essential for cross bridge formation?

ii) Which hormones are released from adrenal medulla? Why they called emergency hormones?

iii) Why cardiac muscles not fatigue?

iv) Why star fish and jelly fish do not need Osmoregulation?

v) Why degenerative disorder of CNS is not curable?

vi) Why menstruation cease during pregnancy?

vii) How do Osmoregulation take place in terrestrial animals?

viii) Why hormones secreted from adrenal cortex are called "Corticosteroids"?

2. (b) NON-REASONING QUESTIONS:

ix) Differentiate bone and cartilage.

x) Write a note on Sprain OR Spondylosis.

xi) Enlist the causes of infertility in male.

xii) Define joints. Name various types of joints.

xiii) Write any four functions of Hypothalamus.

xiv) State the causes and symptoms of Gonorrhea.

xv) Describe miscarriage.

Section C (Detailed –Answer Question) (18)

NOTE: Attempt any TWO question from this section. All questions carry equal marks.

3. Define Thermoregulation. Explain its mechanism in human during hot and cold environment.

—OR—Explain sliding filament model of muscle contraction and also describe cross bridge cycle with the help of labelled diagram.

4. Explain the structure and function of different parts of Human Brain. (diagram is not required)

—OR—Define menstruation. Describe its various phases and changes.

5. Define pituitary glands. Describe their lobes and secreted hormones.

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